CN113033224A

CN113033224A - Radio frequency tag reading and writing device and radio frequency tag reading and writing method

Info

Publication number: CN113033224A
Application number: CN201911361454.0A
Authority: CN
Inventors: 颜力
Original assignee: Cainiao Smart Logistics Holding Ltd
Current assignee: Cainiao Smart Logistics Holding Ltd
Priority date: 2019-12-25
Filing date: 2019-12-25
Publication date: 2021-06-25

Abstract

The application discloses a radio frequency tag reading and writing device, a tag printer, an electronic surface sheet printer, a radio frequency tag reading and writing method, a radio frequency tag reading and writing device and a readable storage medium. The method comprises the following steps: the radio frequency reader-writer is used for sending an inquiry command with a time slot counting parameter of 0 and selecting a target radio frequency tag corresponding to a target response signal with the strongest signal strength to perform read-write operation under the condition of receiving response signals sent by at least two radio frequency tags in the same time slot; according to the method and the device, the query instruction with the time slot counting parameter of 0 is utilized, one target radio frequency tag is accurately determined to perform read-write operation each time, and the situation that the radio frequency reader-writer performs serial read and serial write is greatly reduced. The internal design of the radio frequency tag reading and writing device does not need to pay attention to the radiation distance of an electromagnetic field, and the design and hardware cost of the radio frequency tag reading and writing device are reduced.

Description

Radio frequency tag reading and writing device and radio frequency tag reading and writing method

Technical Field

The application relates to the technical field of radio frequency reading and writing, in particular to a radio frequency tag reading and writing device, a tag printer, an electronic bill printer, a checkout device, a checkout system, a radio frequency tag reading and writing method, equipment and a readable storage medium.

Background

Through the ultrahigh Frequency Radio Frequency Identification (RFID) technology, information can be efficiently and conveniently recorded into a Radio Frequency tag for storage, so that the RFID technology is widely applied to the fields of tag printing, express waybill printing and the like.

In the prior art, similar to the above field, there may be a need to read and write only a required radio frequency tag each time, but since the radiation distance of the radiation field of the radio frequency antenna is difficult to control, the radiation field may enable a plurality of radio frequency tags to obtain energy at the same time, so that the radio frequency reader reads a plurality of radio frequency tags, for example, the radio frequency reader should read and/or write the radio frequency tag a originally, but since other tags also obtain energy, the radio frequency reader reads and writes the radio frequency tag B which is not required, the radio frequency reader cannot correctly read and write the required radio frequency tag, and subsequent data processing errors are caused. Taking the prior label printer as an example, in the label printer, label paper with radio frequency labels is connected in sequence to form a label paper roll, and stored in a printer, a radio frequency reader-writer and an RFID general antenna are also arranged in the label printer, the RFID general antenna can generate a radiation field, but because the radiation distance of the radiation field is difficult to control, the radiation field can enable the radio frequency tags in a plurality of label paper to obtain energy at the same time, even enable the radio frequency tags in the printed label paper to obtain energy, thereby causing that the radio frequency reader-writer reads the radio frequency tags of a plurality of label paper, which radio frequency tag of the label paper needs to be read and written at present, causing abnormal printing, in order to solve this problem, a metal shield case may be provided around the RFID general-purpose antenna and on the printer case to limit the radiation distance of the RFID general-purpose antenna.

However, the inventor finds that, in the current scheme, the metal shielding case is arranged around the RFID general-purpose antenna and on the device housing, so that the design difficulty of the installation position of the metal shielding case is high, and the cost of the device is greatly increased by adding the metal shielding case to the device.

Content of application

In view of the above problems, the present application is made to provide a radio frequency tag reading and writing device, a tag printer, an electronic surface sheet printer, a checkout device, a checkout system, a radio frequency tag reading and writing method, an apparatus, and a readable storage medium that overcome the above problems.

According to an aspect of the present application, there is provided a radio frequency tag read/write apparatus, including:

the radio frequency reader-writer is used for sending an inquiry command with a time slot counting parameter of 0 and selecting a target radio frequency tag corresponding to a target response signal with the strongest signal intensity to perform read-write operation under the condition of receiving response signals sent by at least two radio frequency tags in the same time slot;

the time slot counting parameter of 0 is used for controlling at least two radio frequency tags receiving the query instruction to send response signals in the same time slot after receiving the query instruction.

In accordance with another aspect of the present application, there is provided a label printer comprising: the device comprises a box body, a radio frequency reader-writer, a tag energy providing module and a tag moving assembly; the radio frequency reader-writer, the tag moving assembly and the tag energy providing module are arranged in the box body; the radio frequency reader-writer is connected with the tag energy providing module; the radio frequency reader-writer is used for controlling the tag energy providing module to generate an electromagnetic field with the strength reaching a preset threshold value; the electromagnetic field is used for providing energy for the radio frequency tag in the preset range;

the radio frequency reader-writer is also used for sending an inquiry instruction with a time slot counting parameter of 0 and selecting a target radio frequency tag corresponding to a target response signal with the strongest signal intensity to perform read-write operation under the condition of receiving response signals sent by at least two radio frequency tags in the same time slot;

the label moving assembly is used for sequentially moving the plurality of carriers corresponding to the plurality of radio frequency labels into or out of the preset range;

According to another aspect of the present application, there is provided an electronic surface sheet printer, comprising:

the label comprises a box body, a radio frequency reader-writer, a label energy providing module, a label moving assembly and a printing assembly; the box body, the radio frequency reader-writer, the label energy providing module, the label moving assembly and the printing assembly are arranged in the box body; the radio frequency reader-writer is connected with the tag energy providing module;

the radio frequency reader-writer is used for controlling the tag energy providing module to generate an electromagnetic field with the strength reaching a preset threshold value; the electromagnetic field is used for providing energy for the radio frequency tag in the preset range;

the printing component is arranged facing the surface of the carrier; the printing component is used for acquiring printing information aiming at the carrier and printing the printing information on the surface of the carrier;

In accordance with another aspect of the present application, there is provided a checkout apparatus comprising: the tag energy providing module, the radio frequency reader-writer and the account settling station;

the radio frequency reader-writer and the tag energy providing module are arranged on the account settling station, and the radio frequency reader-writer is connected with the tag energy providing module;

the radio frequency reader-writer is used for controlling the tag energy providing module to generate an electromagnetic field with the intensity reaching a preset threshold value on the account table; the electromagnetic field is used for providing energy for a radio frequency tag on the account-taking station, and the radio frequency tag is arranged on a carrier;

the radio frequency reader-writer is used for sending an inquiry instruction with a time slot counting parameter of 0, selecting a target radio frequency tag corresponding to a target response signal with the strongest signal intensity to perform reading operation under the condition of receiving a response signal sent by at least one radio frequency tag in the same time slot, obtaining third tag information of the target radio frequency tag, and sending the third tag information to a checkout server.

In accordance with another aspect of the present application, there is provided a checkout system comprising: the checkout server and at least one checkout device are connected in a communication mode; and the checkout server performs checkout operation according to the third label information.

According to another aspect of the present application, there is provided a radio frequency tag reading and writing method, including:

the radio frequency reader-writer sends out a query instruction with a time slot counting parameter of 0;

under the condition that the radio frequency reader-writer receives response signals sent by at least two radio frequency tags in the same time slot, selecting a target radio frequency tag corresponding to a target response signal with the strongest signal intensity to perform reading-writing operation;

According to another aspect of the application, there is provided an apparatus comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor when executing the computer program implements a method according to one or more of the above.

According to another aspect of the application, a computer-readable storage medium is provided, on which a computer program is stored, characterized in that the program, when executed by a processor, implements a method as described in one or more of the above.

According to the embodiment of the application, the radio frequency reader-writer can control each radio frequency tag receiving the query instruction to simultaneously send the response signal to the radio frequency reader-writer through the query instruction with the time slot counting parameter of 0, under the condition, the radio frequency tag with the strongest signal is selected from the received response signals to read and write, so that the radio frequency reader-writer can accurately determine one target radio frequency tag to perform read-write operation each time, the condition that the radio frequency reader-writer performs serial reading and serial writing under the condition that a plurality of radio frequency tags obtain energy simultaneously is greatly reduced, the internal design of the radio frequency tag read-write device does not need to pay attention to the radiation distance of an electromagnetic field, an additional metal shielding shell does not need to be added in the radio frequency tag read-write device, and the design and hardware cost of the radio frequency tag read-write device are reduced.

The foregoing description is only an overview of the technical solutions of the present application, and the present application can be implemented according to the content of the description in order to make the technical means of the present application more clearly understood, and the following detailed description of the present application is given in order to make the above and other objects, features, and advantages of the present application more clearly understandable.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the alternative embodiments. The drawings are only for purposes of illustrating alternative embodiments and are not to be construed as limiting the application. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:

FIG. 1 is a block diagram of an RF tag reader/writer according to the present application;

FIG. 2 is a block diagram of another RF tag reader/writer according to the teachings of the present application;

fig. 3 shows an assembly structure diagram of a radio frequency reader-writer and microstrip line assembly provided by the present application;

fig. 4 shows an operational schematic diagram of a microstrip line assembly according to an embodiment of the present application;

FIG. 5 is a block diagram of an alternative RF tag reader/writer according to an embodiment of the present application;

FIG. 6 is a schematic diagram illustrating a top view of an RF tag reader/writer according to the present application;

FIG. 7 illustrates a rear view of a radio frequency tag reader/writer apparatus according to the present application;

FIG. 8 illustrates an assembly schematic of another microstrip line assembly and radio frequency reader/writer provided in accordance with the present application;

FIG. 9 illustrates an assembly schematic of another microstrip line assembly and radio frequency reader/writer provided in accordance with the present application;

fig. 10 is a block diagram illustrating an architecture of a radio frequency reader/writer according to an embodiment of the present application;

FIG. 11 illustrates a block diagram of a checkout device according to an embodiment of the present application;

FIG. 12 illustrates a block diagram of a checkout system according to an embodiment of the present application;

FIG. 13 is a flow chart illustrating steps of a method for reading from and writing to a radio frequency tag according to an embodiment of the present application;

FIG. 14 illustrates an exemplary system that can be used to implement various embodiments described in this disclosure.

Detailed Description

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

To enable those skilled in the art to better understand the present application, the following description is made of the concepts related to the present application:

ultra High Frequency (UHF): it is a radio wave with a frequency of 300 MHz to 3000 MHz and a wavelength of 1 m to 1 dm, and the radio wave in this band is also called a dm wave.

A radio frequency reader-writer: the radio frequency reader-writer is used for reading out the label information in the radio frequency label or writing the label information into the radio frequency label. According to different structures and technologies, the radio frequency reader-writer can comprise a reading device and a writing device, a power interface and a radio frequency interface, wherein the power interface is connected with a power supply and used for supplying power to the radio frequency reader-writer, and the radio frequency interface is connected with the transmission line assembly and used for supplying power to the transmission line assembly when the radio frequency tag reading-writing device works so as to enable the transmission line assembly to generate an electromagnetic field.

Carrier: the carrier may include a radio frequency tag, and the carrier may be tag paper, or may be other objects carrying the radio frequency tag. It should be noted that the carrier can be used as an express waybill and attached to the surface of the package. Alternatively, the carrier may be an item, such as a good for sale or presentation in a mall, supermarket, convenience store or the like.

The radio frequency tag is composed of a transmitting-receiving antenna, an alternating current-direct current conversion circuit, a demodulation circuit, a logic control circuit, a memory and a modulation circuit. Wherein, the receiving and dispatching antenna: receiving the signal from the radio frequency reader-writer and sending the required data back to the radio frequency reader-writer. AC-DC conversion circuit: the energy of the electromagnetic field is utilized and is output by the voltage stabilizing circuit to provide a stable power supply for other circuits. A demodulation circuit: and removing the carrier wave from the received signal and demodulating the original signal. The logic control circuit: and decoding the signal from the radio frequency reader-writer and sending back the signal according to the requirement of the radio frequency reader-writer. A memory: as a location for system operation and storage of identification data. A modulation circuit: and data sent by the logic control circuit is loaded to the antenna through the modulation circuit and then sent to the radio frequency reader-writer.

And (3) radio frequency identification: a method for reading information stored in a radio frequency tag by a radio frequency reader-writer and writing preset information into the radio frequency tag by the radio frequency reader-writer through non-contact data communication between the radio frequency reader-writer and the radio frequency tag. Specifically, the basic working principle of the radio frequency identification technology includes reading information: after entering an electromagnetic field, the radio frequency tag receives a radio frequency signal sent by a radio frequency reader-writer, and sends out product information stored in a chip of the radio frequency tag by virtue of energy obtained by induced current generated by the electromagnetic field; or, the radio frequency tag entering the electromagnetic field actively sends a signal with a certain frequency to the radio frequency reader-writer, and the radio frequency reader-writer reads and decodes the information to obtain tag information. Writing information: after reading the radio frequency tag, the radio frequency reader-writer sends a modulated carrier wave preset with information, an antenna of the radio frequency tag demodulates the received modulated carrier wave, and stores the information obtained after demodulation to finish writing operation.

A transmission line assembly: is a linear structure component for transmitting electromagnetic energy. Transmission line assemblies are an important component of telecommunication systems for transporting information-bearing electromagnetic waves from one point to another along a route defined by the transmission line. The field intensity in the electromagnetic field generated by the transmission line assembly is stable, the coverage range of the electromagnetic field generated by the transmission line assembly is controllable, and the transmission line assembly can stably control the range of the electromagnetic field.

In an implementation of the embodiment of the present invention, referring to fig. 1, an architecture diagram of a radio frequency tag read/write apparatus provided in the embodiment of the present application is shown, where the radio frequency tag read/write apparatus may include: when the rf tag reader/writer device operates, the rf reader/writer 20 and the server 50 may have a plurality of carriers 30 and an electromagnetic field for providing energy to the rf tags 301 disposed in the carriers 30 around the rf reader/writer 20.

In this embodiment, referring to fig. 2, the radio frequency reader/writer 20 may be in communication connection with the communication device 201 in a wired or wireless manner, and the communication device 201 may obtain, in real time, first tag information that needs to be written into the radio frequency tag 301 of the carrier 30 from the server 40, and forward the first tag information to the radio frequency reader/writer 20, so that the radio frequency reader/writer 20 writes the first tag information into the radio frequency tag of the carrier.

An air interface protocol is preset in the radio frequency reader-writer 20, the air interface protocol defines a communication rule between the radio frequency reader-writer 20 and the corresponding radio frequency tag 301, and specifically specifies a working mode and working parameters of the radio frequency reader-writer 20, and the radio frequency reader-writer 20 can realize read-write operation on the radio frequency tag 301 based on the air interface protocol.

In this embodiment, the radio frequency reader/writer 20 may send an inquiry command including a time slot count parameter of 0 according to an air interface protocol, and if there are the radio frequency tags 301 and an electromagnetic field capable of providing energy for the radio frequency tags 301 in a sending range of the inquiry command, the radio frequency tags 301 may receive the inquiry command and send response signals to the radio frequency reader/writer 20 in the same time slot according to the inquiry command with a value of 0, so that the radio frequency reader/writer 20 may select a target radio frequency tag corresponding to a target response signal with the strongest signal strength to perform read/write operations by distinguishing the strength of the response signal after receiving all the response signals. For example, when only one rf tag is in the electromagnetic field, the rf tag receives the query instruction, directly enters a working state based on the slot count parameter 0, and sends a response signal to the rf reader/writer. If two or more than two radio frequency tags exist in the electromagnetic field, the radio frequency tags receive the query instruction, directly enter a working state based on the time slot counting parameter 0, and send response signals to the radio frequency reader-writer.

Specifically, the radio frequency reader-writer performs read-write processing on a plurality of radio frequency tags which obtain energy simultaneously, which can be understood as that the radio frequency reader-writer performs inventory on the plurality of radio frequency tags, the time slot counting parameter q is used for initializing an inventory process and determining which radio frequency tags participate in the inventory process, the inventory process can be defined as the time between two inquiry commands, and when one radio frequency tag receives an inquiry command, the time slot counting parameter q included in the inquiry command specifies that the radio frequency tag should be (0, 2)^q-1) selecting a value in the time slot counting range, and placing the value in its own time slot counter, and when the radio frequency tag whose time slot counter has selected 0 should be transferred to a response state, then generating a unique random number RN16 corresponding to the radio frequency tag by a random number generator, and immediately responding a response signal including the random number RN16 to the radio frequency reader-writer; and selecting the radio frequency tag with a value of non-0 in the time slot counter to wait for the next query instruction.

In the embodiment of the present invention, when the slot count parameter is 0, the slot count range corresponding to the slot count parameter is (0, 0), and therefore, when a plurality of radio frequency tags receive an inquiry command at the same time, the radio frequency tags must select a value of 0 in the same slot count range (0, 0), so that all the radio frequency tags enter a response state, and then a random number generator generates a unique random number RN16 corresponding to the radio frequency tag, and simultaneously responds to a response signal including the random number RN16 to the radio frequency reader/writer.

The radio frequency reader-writer can analyze the signal strength of a plurality of received response signals sent by a plurality of radio frequency tags at the same time, determine a target radio frequency tag corresponding to a target response signal with the strongest signal strength at a response moment, ignore other radio frequency tags except the target radio frequency tag, and further perform read-write operation on the target radio frequency tag, thereby achieving the purpose of accurately determining one target radio frequency tag to perform read-write operation each time.

For a plurality of radio frequency tags, the response interaction process with the radio frequency reader-writer is as follows:

step 1, when the radio frequency tag receives an inquiry command comprising a time slot counting parameter of 0, selecting a value of 0 in a range of (0, 0), entering a response state, generating a random number RN16, and answering a response signal comprising the random number RN16 to the radio frequency reader-writer.

And 2, selecting the target response signal with the strongest signal intensity from all the response signals by the radio frequency reader-writer.

And 3, the radio frequency reader-writer sends an ACK command containing the RN16 corresponding to the target response signal to the radio frequency tag, and after the target radio frequency tag receives the ACK command, the operation of confirming the target radio frequency tag can be realized according to the RN16 corresponding to the target response signal in the ACK command.

And 4, transferring the confirmed target radio frequency tag to a confirmation state, and sending the tag identification information to the reader-writer.

And 5, the radio frequency reader-writer can start to perform subsequent read-write operation on the target radio frequency tag.

In another implementation of the embodiment of the present invention, further, referring to fig. 2, which shows an architecture diagram of another rf tag read/write apparatus provided in the embodiment of the present application, in practical application, the rf tag read/write apparatus may include: the box 10, the radio frequency reader-writer 20, the transmission line assembly 40 and the server 50, when the radio frequency tag reading-writing device works, a plurality of carriers 30 can be arranged in the box 10 and sequentially connected, the radio frequency tags 301 are arranged in the carriers 30, and the radio frequency reader-writer 20 and the transmission line assembly 40 are arranged in the box 10.

One end of each of the sequentially connected carriers 30 is fixedly disposed on a rotating shaft 101 of the box 10, the sequentially connected carriers 30 are wound on the rotating shaft 101, and the other end of each of the sequentially connected carriers 30 extends toward a paper outlet 102 disposed on the box 10. The carrier 30 is wound on the rotating shaft 101 and is disposed in the box body 10, so that the occupied space of the carrier 30 in the box body 10 can be effectively reduced, and along with the rotation of the rotating shaft 101, the carrier 30 can be sent out from the paper outlet 102, or the carrier 30 separated from the rotating shaft 101 can be retracted into the rotating shaft 101.

In the present embodiment, the transmission line assembly 40 may include any one of a microstrip line assembly, a stripline assembly, a parallel bifilar assembly, and a coplanar waveguide assembly.

A parallel bifilar assembly: the transmission line is composed of two parallel conductive metal wires and is used for transmitting transverse electromagnetic waves. According to the structure, the device can be divided into a symmetrical type and a coaxial type.

A stripline assembly: the strip line is a transmission line composed of two grounding metal strips and a middle rectangular section conductor strip, and because the strip line assembly is formed by combining one or more pairs of double-conductor transmission lines, and the double-conductor transmission lines are close to each other, an electromagnetic coupling phenomenon can be generated.

Coplanar waveguide assembly: a hardware structure or device for forming a waveguide transmission structure in cooperation with a carrier of conductive material. The waveguide assembly may include an input feed and an output feed, the input feed and the output feed may be disposed at different positions on the surface of the carrier, the input feed may receive electric energy provided by the radio frequency reader, and transmit the electric energy to the output feed based on the carrier of a conductive material, so that an electromagnetic field of a non-radiative property is formed near the carrier through electric energy transmission among the input feed, the carrier, and the output feed.

Microstrip line subassembly: the microwave transmission line is a microwave transmission line formed by a single conductor strip supported on a dielectric substrate, and can be used as a mechanism for guiding electromagnetic waves, so that a stable non-radiation electromagnetic field can be generated around the conductor strip under the condition of obtaining power supply of a radio frequency reader-writer. The microstrip line assembly has the advantages of small volume, light weight, wide use frequency band, high reliability and low manufacturing cost, and the electromagnetic field generated by the microstrip line assembly has stable field intensity and can stably control the range of the electromagnetic field.

In the embodiment of the present application, the transmission line assembly 40 is a microstrip line structure, and a description about the rf tag read/write apparatus is performed.

In the application, the radio frequency reader-writer can control each radio frequency tag receiving the query instruction to simultaneously send a response signal to the radio frequency reader-writer through the query instruction with the time slot counting parameter of 0, under the condition, the radio frequency tag with the strongest signal is selected from the received response signals to read and write, so that the radio frequency reader-writer can accurately determine one target radio frequency tag to perform read-write operation at each time, the condition that the radio frequency reader-writer performs serial reading and serial writing under the condition that a plurality of radio frequency tags obtain energy simultaneously is greatly reduced, the internal design of the radio frequency tag read-write device does not need to pay attention to the radiation distance of an electromagnetic field, an additional metal shielding shell does not need to be added in the radio frequency tag read-write device, and the design and hardware cost of the radio frequency tag read-write device are reduced. In addition, the method can also utilize the characteristic that the transmission line component generates a traveling wave structure with stable field intensity and relatively fixed electromagnetic field range for surface wave transmission in a working state, so that the purpose of restricting the electromagnetic field range in the radio frequency tag reading and writing device is realized. Because the electromagnetic field generated by the transmission line assembly is restricted in a very small range near the transmission line, the radio frequency tags of a plurality of carriers which are connected in sequence can be prevented from obtaining energy simultaneously, the problem of serial reading and serial writing of the radio frequency reader-writer can be further solved, the radio frequency reader-writer can perform read-write operation on a certain radio frequency tag more accurately, the radiation distance of the electromagnetic field does not need to be concerned in the internal design of the radio frequency tag read-write device, an additional metal shielding shell does not need to be added in the radio frequency tag read-write device, and the design and hardware cost of the radio frequency tag read-write device are reduced.

In an embodiment provided in this application, referring to fig. 1, the rf tag reading/writing apparatus includes: the radio frequency reader-writer 20 is used for sending an inquiry instruction with a time slot counting parameter of 0 and selecting a target radio frequency tag corresponding to a target response signal with the strongest signal intensity to perform read-write operation under the condition of receiving response signals sent by at least two radio frequency tags 301 in the same time slot; the time slot counting parameter of 0 is used to control at least two radio frequency tags 301 receiving the query instruction to send a response signal in the same time slot after receiving the query instruction.

Optionally, the radio frequency reader is specifically configured to: sending a query instruction with a time slot counting parameter of 0 according to a preset air interface protocol; under the condition that response signals containing random numbers and sent by at least two radio frequency tags in the same time slot are received, determining a target response signal with the strongest signal strength in the at least two response signals; sending a confirmation instruction comprising the target random number according to the target random number in the target response signal; the confirmation instruction is used for controlling the target radio frequency tag corresponding to the target random number to enter a working state; and performing reading operation or writing operation on the target radio frequency tag.

In this embodiment of the present application, the radio frequency reader/writer may send an inquiry instruction including a time slot count parameter of 0 according to an air interface protocol, and if there are radio frequency tags and an electromagnetic field capable of providing energy for the radio frequency tags in a sending range of the inquiry instruction, the radio frequency tags may receive the inquiry instruction and send response signals to the radio frequency reader/writer in the same time slot according to the inquiry instruction with the value of 0, so that the radio frequency reader/writer 20 may select a target radio frequency tag corresponding to a target response signal with the strongest signal strength to perform read/write operations by distinguishing the strength of the response signal after receiving all the response signals.

Specifically, the radio frequency reader-writer performs read-write processing on a plurality of radio frequency tags which obtain energy simultaneously, which can be understood as that the radio frequency reader-writer performs inventory on the plurality of radio frequency tags, the time slot counting parameter q is used for initializing an inventory process and determining which radio frequency tags participate in the inventory process, the inventory process can be defined as the time between two inquiry commands, and when one radio frequency tag receives an inquiry command, the time slot counting parameter q included in the inquiry command specifies that the radio frequency tag should be (0, 2)^q-1) selecting a random number within the time slot counting range, and placing the random number in a time slot counter of the tag, wherein the radio frequency tag selected to have a value of 0 should be transferred to a response state, and immediately responding a response signal including the random number RN16 to the radio frequency reader-writer; and selecting the radio frequency tag with a value of not 0 to wait for the next query instruction.

In the embodiment of the present invention, when the slot count parameter is 0, the slot count range corresponding to the slot count parameter is (0, 0), and therefore, when a plurality of radio frequency tags receive the query command at the same time, the radio frequency tags must select a value of 0 in the same slot count range (0, 0), so that all of the radio frequency tags enter a response state and simultaneously respond to the response signal including the random number RN16 to the radio frequency reader/writer.

In summary, according to the response signal received by the radio frequency reader, because the target radio frequency tag corresponding to the target response signal with the strongest signal strength is usually closest to the radio frequency reader, the radio frequency reader can accurately determine one target radio frequency tag to perform read-write operation each time through the query instruction including the time slot counting parameter of 0, so that the situation that the radio frequency reader reads and writes serially is greatly reduced when a plurality of radio frequency tags obtain energy simultaneously. The internal design of the radio frequency tag reading and writing device does not need to pay attention to the radiation distance of an electromagnetic field, so that an additional metal shielding shell does not need to be added in the radio frequency tag reading and writing device, and the design and hardware cost of the radio frequency tag reading and writing device is reduced.

Optionally, the apparatus further comprises: the radio frequency reader-writer is connected with the transmission line assembly; and the radio frequency reader-writer is used for controlling the transmission line assembly to generate an electromagnetic field with the strength reaching the preset threshold value in the preset range.

Wherein, the transmission line component can also be an antenna.

The microstrip line assembly is simpler in form and structure and more flexible in application.

Referring to fig. 2, the rf tag reader/writer further includes: the microstrip line assembly 40, the radio frequency reader-writer 20 is connected with the microstrip line assembly 40;

the radio frequency reader/writer 20 is configured to control the microstrip line assembly 40 to generate an electromagnetic field with strength reaching the preset threshold value in the preset range.

The microstrip line assembly 40 is connected to the radio frequency interface of the radio frequency reader/writer 20, after the microstrip line assembly 40 obtains the radio frequency interface of the radio frequency reader/writer 20 for power supply, the microstrip line assembly 40 may form a surface wave transmission traveling wave structure at the structure edge thereof, the surface wave transmission traveling wave structure is generated from the surface of the structure edge of the microstrip line assembly 40 to form a near field electromagnetic field of a preset range size, and the shape of the near field electromagnetic field is similar to a slender "iron rod", so that the purpose of high-precision electromagnetic field restriction can be achieved, the near field electromagnetic field is tightly attached to the carrier 30 passing through the structure edge of the microstrip line assembly 40, so that the radio frequency tag of the carrier 30 passing through the structure edge of the microstrip line assembly 40 obtains the energy of the electromagnetic field, and the read/write operation.

Optionally, the size of the preset range is greater than or equal to the size of the radio frequency tag, and the size of the preset range is less than or equal to the size of the carrier.

In this embodiment, referring to fig. 6, a schematic top view diagram of a radio frequency tag reading/writing apparatus provided in this embodiment is shown, where an interval between a conductor strip 401 of a microstrip line assembly 40 and a carrier 30 may be smaller than or equal to a preset distance value, and an electromagnetic field strength generated by the microstrip line assembly 40 needs to reach a preset threshold value, so as to ensure that a radio frequency tag 301 can obtain energy from an electromagnetic field. . It will be appreciated that the perpendicular distance between the conductor strip 401 of the microstrip line assembly 40 and the carrier within the predetermined range C is less than or equal to a predetermined distance value.

In the embodiment of the present application, the size of the preset range C may be greater than or equal to the size of the radio frequency tag 301, so that the radio frequency reader/writer 20 may read the radio frequency tag 301 of at least one carrier 30, and in addition, the size of the preset range C may be less than or equal to the size of the carrier 30, so as to prevent the radio frequency reader/writer 20 from reading the radio frequency tags 301 of multiple carriers 30 at the same time, which may result in serial reading and serial writing. In addition, the radio frequency tag 301 has a transceiver antenna (not shown in the figure), which can obtain an induced current generated by an electromagnetic field, so that the radio frequency tag 301 obtains energy, because the transceiver antenna has a fixed transceiver range, the radio frequency tag 301 can obtain energy from the electromagnetic field only when the intensity of the electromagnetic field reaches a certain threshold and the electromagnetic field is within a certain distance from the radio frequency tag, so that the vertical distance between the conductor strip 401 of the microstrip line assembly 40 and the carrier within the preset range C can be smaller than or equal to a preset distance value, and the intensity of the electromagnetic field generated by the microstrip line assembly 40 needs to reach the preset threshold, so that the radio frequency tag 301 can obtain energy from the electromagnetic field.

Because the electromagnetic field generated by the microstrip line component is restricted in a very small range near the microstrip line, the problem that the radio frequency tags of a plurality of carriers which are connected in sequence can obtain energy simultaneously can be further solved, the radio frequency reader can read and write a string of the radio frequency reader-writer, the radio frequency reader-writer can accurately read and write a certain radio frequency tag, and the internal design of the radio frequency tag read-write device does not need to pay attention to the radiation distance of the electromagnetic field, so that an additional metal shielding shell does not need to be added in the radio frequency tag read-write device, and the design and hardware cost of the radio frequency tag read-write device are reduced.

Optionally, referring to fig. 3, an assembly structure diagram of a radio frequency reader/writer and a microstrip line assembly provided in an embodiment of the present application is shown. Wherein, the microstrip line assembly 40 includes: substrate 403, conductor strip 401, matching load 402.

The substrate 403 includes: the antenna comprises a metal layer 4031 and a dielectric layer 4032, wherein the dielectric layer 4032 is arranged on the surface of the metal layer 4031, the conductor strip 401, the radio frequency reader-writer 20 and the matching load 402 are arranged on one surface of the dielectric layer 4032, which is far away from the metal layer 4031; one end of the conductor strip 401 is connected with a radio frequency interface of the radio frequency reader-writer 20, and the other end of the conductor strip 401 is connected with a matched load 402; the rf reader/writer 20 is configured to supply power to the conductor strip 401 through the rf interface, so that the conductor strip 401 generates an electromagnetic field with a strength reaching a predetermined threshold.

Specifically, the material of the dielectric layer 4032 may include: the conductive tape 401 may be made of a metal material, and the metal layer 4031 may be made of a material having a heat resistance level of FR-4, a plurality of materials such as Polycarbonate (PC), Polyvinyl chloride (PVC), Styrene resin (ABS), and the like. In addition, the rf reader/writer 20 may be integrated on the substrate 403 to reduce the installation space inside the rf tag reader/writer. It should be noted that the rf reader 20 may also be integrally disposed on the dielectric layer 4032, so as to reduce the installation space inside the rf tag reader.

Further, referring to fig. 7, a rear view of the rf tag reading/writing device according to an embodiment of the present application is shown, where in order to facilitate viewing of an internal structure of the rf tag reading/writing device, a rear shell of the rf tag reading/writing device is removed in fig. 7, one end of the conductor strip 401 is connected to the rf interface of the rf reader/writer 20, and the other end of the conductor strip 401 is connected to the matching load 402. Further referring to fig. 4, it shows an operation schematic diagram of a microstrip line assembly provided in this embodiment of the present application, where implementation represents an electric field, and a dotted line represents a magnetic field, and after the microstrip line assembly 40 obtains power supply from the radio frequency interface of the radio frequency reader/writer 20, one end of the conductor strip 401 serves as a feeding input, and the other end serves as a feeding output to the matching load 402, so as to form a traveling wave structure of surface wave transmission, and the traveling wave structure of surface wave transmission is generated from the surface of the conductor strip 401, forming a near-field electromagnetic field, so that it can achieve the purpose of high-precision electromagnetic field constraint.

Optionally, referring to fig. 8, which shows an assembly schematic diagram of another microstrip line assembly and a radio frequency reader/writer provided in the embodiment of the present application, the microstrip line assembly 40 further includes: rf cable 404, substrate 403 includes: a first substrate 4033 and a second substrate 4034, the conductor strip 401 comprising: a first conductor strip 4011 and a second conductor strip 4012; the first conductor strip 4011 and the radio frequency reader/writer 20 are provided on the first substrate 4033, and the second conductor strip 4012 and the matching load 403 are provided on the second substrate 4034; one end of the first conductor strip 4011 is connected to a radio frequency interface of the radio frequency reader/writer 20, one end of the first conductor strip 4011 is connected to one end of the radio frequency cable 404, the other end of the radio frequency cable 404 is connected to one end of the second conductor strip 4012, and the other end of the second conductor strip 4012 is connected to the matching load 402; the rf reader/writer 20 is configured to supply power to the first conductor strip 4011 through the rf interface, so that the second conductor strip 4012 generates an electromagnetic field with strength reaching a preset threshold.

In fig. 8, another form of microstrip line assembly is shown, wherein a conductor strip 401 may comprise: the first conductor strip 4011 and the second conductor strip 4012 are connected through a flexible radio frequency cable 404, when the microstrip line assembly works, an electromagnetic field is generated on the surface of the second conductor strip 4012, and the second conductor strip 4012 can be arranged close to the carrier, so that the energy of the electromagnetic field can be obtained through the carrier of the second conductor strip 4012. In addition, since the flexible rf cable 404 can be bent or bent, the microstrip line assembly shown in fig. 8 can be bent to the state shown in fig. 9, thereby facilitating the design of mounting components adjacent to the microstrip line assembly in the rf tag reader/writer.

Optionally, referring to fig. 2, the radio frequency tag reading/writing device further includes: a communication device 201; the rf reader 20 is specifically configured to, in a case of receiving preset communication information sent by the rf tag of the carrier, obtain, through the communication device 201, first tag information for the carrier from the server 50, and write the first tag information into the rf tag of the carrier.

In this embodiment, referring to fig. 6, when the receiving and transmitting antenna of the radio frequency tag of the to-be-printed carrier B enters the electromagnetic field induction range generated by the microstrip line assembly 40, the radio frequency tag of the to-be-printed carrier B obtains energy of an electromagnetic field through the receiving and transmitting antenna, and sends the preset communication information to the radio frequency reader/writer 20 through the receiving and transmitting antenna.

The radio frequency reader/writer 20 may determine that the to-be-printed carrier B is currently within the preset range C when receiving the preset communication information sent by the radio frequency tag of the to-be-printed carrier B. Then, the radio frequency reader/writer 20 may obtain the first label information for the carrier B to be printed from the server 50 through the communication device 201; writing the first label information into the radio frequency label of the carrier B to be printed, where the first label information may be information required by the carrier B to be printed, for example, when the carrier is an express bill, the first label information may include information of a commodity type, a price, a delivery location, a destination, and the like of an express package.

Optionally, referring to fig. 6, the radio frequency reader 20 is further configured to receive second tag information sent by the radio frequency tag of the carrier B to be printed, where the second tag information is information sent by the radio frequency tag after the radio frequency tag acquires the first tag information; under the condition that the first label information is matched with the second label information, moving the carrier B to be printed out of the preset range C; and under the condition that the first label information is not matched with the second label information, writing the first label information into the radio frequency label of the carrier B to be printed again until the first label information is matched with the second label information.

In the embodiment of the present application, in order to ensure the accuracy of writing the tag information and reduce the probability of missed writing and incorrect writing, result verification needs to be performed on the writing operation of the tag information. Specifically, after the radio frequency reader-writer 20 completes writing the first tag information, the first tag information may be stored locally in the radio frequency reader-writer 20, after the radio frequency tag of the to-be-printed carrier B acquires the first tag information, all information in the memory of the to-be-printed carrier B may be encapsulated into second tag information and sent to the radio frequency reader-writer 20, the radio frequency reader-writer 20 performs matching verification on the first tag information and the second tag information, when the first tag information and the second tag information are completely and regularly matched, it may be considered that the current writing operation for the to-be-printed carrier B is completed, the to-be-printed carrier B may be moved out of the preset range C, and writing of a next carrier is prepared.

In practical application, if the second tag information is empty or incomplete, the first tag information is not matched with the second tag information, the radio frequency reader/writer 20 may consider that the first tag information is not written into the carrier B to be printed, the radio frequency tag reader/writer device may keep the carrier B to be printed within the preset range C, and the radio frequency reader/writer 20 repeats the operation of writing the first tag information into the carrier B to be printed until the first tag information is matched with the second tag information. In addition, if the second tag information is complete and not empty, but the first tag information and the second tag information are still not matched, it is considered that the radio frequency reader-writer 20 writes the first tag information into a carrier other than the carrier B to be printed, or receives the second tag information sent by other carriers, and at this time, it can be determined that a serial reading and serial writing fault occurs in the radio frequency reader-writer 20, and a maintenance person can be dispatched to remove the fault.

Optionally, before writing the first tag information into the radio frequency tag of the carrier, encrypting the first tag information, and generating a first electronic product code; adding a first electronic product code to the first tag information; after second label information sent by a radio frequency label of the carrier is received, a second electronic product code of the second label information is obtained; and the second tag information is information sent by the radio frequency tag after the radio frequency tag acquires the first tag information.

In case the first electronic product code and the second electronic product code match, the carrier is moved out of the preset range.

And in the case that the first electronic product code and the second electronic product code do not match, rewriting the first tag information into the radio frequency tag of the carrier until the first electronic product code and the second electronic product code match.

In this embodiment of the application, since the second tag information sent by the radio frequency tag after obtaining the energy provided by the electromagnetic field may also be read by other radio frequency read-write devices near the radio frequency tag read-write device, in order to ensure privacy security of data, before the radio frequency reader-writer 20 writes the first tag information into the radio frequency tag of the carrier, the radio frequency reader-writer may further encrypt the first tag information, generate a first Electronic Product Code (EPC) corresponding to the encryption operation, store the first Electronic Product Code locally in the radio frequency reader-writer 20, or store the first Electronic Product Code in a service end through a communication device.

After the radio frequency reader-writer 20 receives the second tag information, extracting a second electronic product code in the second tag information to match the first electronic product code with the second electronic product code, and if the first electronic product code is matched with the second electronic product code, considering that the first tag information is matched with the second tag information, and determining that the writing operation is completed; and if the first tag information and the second tag information are not matched, and the write operation is determined to fail.

Specifically, the Encryption processing performed on the first tag information may be various, for example, built-in key Encryption, Data Encryption Standard (DES) Encryption, and the like. The carrier of the cryptographically generated first electronic product code is an RFID electronic tag. EPC is a new generation product coding system introduced by international bar code organization, the original product bar code is only a code for classifying products, the EPC code is a coding system which endows each single product with a globally unique code and has a 96-bit (binary) EPC coding mode. The EPC code of 96 bits can be assigned to 2.68 hundred million companies, each company can have 1600 million product categories, each product category has 680 million independent product codes, and the EPC code can be vividly assigned to a unique code for each rice grain on the earth.

Optionally, referring to fig. 2, the radio frequency tag reading/writing device further includes: the rotating shaft 101 and a rotating shaft controller (not shown in the figure), the rotating shaft controller is in communication connection with the radio frequency reader-writer 20, and the rotating shaft controller is used for controlling the rotating shaft 101 to rotate; the rotating shaft 101 is used for bearing a plurality of carriers 30 wound on the rotating shaft 101, the plurality of carriers 30 are sequentially connected, one end of the sequentially connected plurality of carriers 30 is fixedly arranged on the rotating shaft 101, and the other end of the sequentially connected plurality of carriers 30 is separated from the rotating shaft 101 and extends towards a direction facing a preset range; the rf reader is specifically configured to control the rotation shaft 101 to work through the rotation shaft controller, so as to sequentially move the plurality of carriers 30 into or out of the preset range.

Specifically, the radio frequency reader/writer 20 is configured to control the rotating shaft 101 to stop rotating through the rotating shaft controller when receiving the preset communication information; under the condition that the local first electronic product code and the second electronic product code of the radio frequency reader-writer 20 are matched, the radio frequency reader-writer 20 is used for controlling the rotation of the rotating shaft 101 through the rotating shaft controller, so that the rotating shaft 101 drives the carrier to move out of the preset range.

Specifically, one end of each of the carriers 30 connected in sequence is fixedly disposed on the rotating shaft 101 of the casing 10, the carriers 30 connected in sequence are wound around the rotating shaft 101, and the other end of each of the carriers 30 connected in sequence extends toward the paper outlet 102 disposed on the casing 10. The carrier 30 is wound on the rotating shaft 101 and is disposed in the box body 10, so that the occupied space of the carrier 30 in the box body 10 can be effectively reduced, and along with the rotation of the rotating shaft 101, the carrier 30 can be sent out from the paper outlet 102, or the carrier 30 separated from the rotating shaft 101 can be retracted into the rotating shaft 101.

Under the condition that the radio frequency reader-writer 20 receives the preset communication information, the radio frequency reader-writer 20 can control the rotating shaft 101 to stop rotating through the rotating shaft controller, and at the moment, the carrier stops in a preset range to prepare for writing operation; under the condition that the local first electronic product code and the local second electronic product code of the radio frequency reader-writer 20 are matched, the radio frequency reader-writer 20 can control the rotation of the rotating shaft 101 through the rotating shaft controller, so that the rotating shaft 101 drives the carrier to move out of the preset range until the carrier is finally moved out of the paper outlet 102 of the radio frequency tag reading-writing device. Under the condition that the local first electronic product code and the local second electronic product code of the radio frequency reader-writer 20 are not matched, the radio frequency reader-writer 20 considers that the writing operation fails, the radio frequency reader-writer 20 can control the rotating shaft 101 to stop rotating through the rotating shaft controller, and the carrier is in a preset range to perform repeated writing operation.

Optionally, referring to fig. 5, which shows an architecture diagram of another radio frequency tag read-write apparatus provided in an embodiment of the present application, where the radio frequency tag read-write apparatus further includes: a printing assembly 60; the printing assembly 60 is disposed facing the surface of the carrier 30; the printing component 60 is used for acquiring the printing information for the carrier 30 from the service end 50 and printing the printing information on the surface of the carrier 30.

The printing component 60 can establish a communication connection with the communication device 201, and the communication device 201 can acquire the printing information for the carrier 30 from the server 50 and forward the printing information to the printing component 60, so that the printing component 60 prints the printing information on the surface of the carrier 30. For example, when an express waybill carrier passes through the rf reader 20 and the microstrip line assembly 40, the rf tag included in the express waybill carrier is written with the first tag information, and then when the express waybill carrier passes through the printing assembly 60, the printing assembly 60 may print all or part of the first tag information on the surface of the express waybill carrier, thereby completing the printing of the express waybill carrier.

Printing assembly 60 can be temperature sensing radio frequency label readwrite device, and the temperature sensing printing technique is through beating printer head concora crush on the temperature sensing label, directly gives the temperature sensing carrier surface heating of outside transmission through the heat-generating body that beats on the printer head for scribble the chemical coating on temperature sensing label surface and be heated blackened, form the writing of printing, and the temperature sensing is printed and is had fast, the noise is low, prints clearly, convenient to use's advantage, can print the carrier of width 4 inches and above.

It should be noted that the printing component 60 may overlap with the positions of the rf reader 20 and the microstrip line component 40, and in addition, the printing component 60 may also be located in front of or behind the rf reader 20 and the microstrip line component 40, which is not limited in this embodiment of the application.

Optionally, the radio frequency reader is specifically configured to perform a read-write operation on the radio frequency tag based on a block write instruction in a preset air interface protocol. Because the instruction set is simplified, the radio frequency reader-writer can be realized by a simple circuit without complex functions, and the cost is convenient to reduce.

In the embodiment of the present application, an air interface protocol of the radio frequency reader may be based on an ISO18000-6C air interface protocol, and the current ISO18000-6C protocol includes three main instruction sets: a select instruction set, a inventory instruction set, an access instruction set. And defines the frequency range and frequency hopping rule of the radio frequency reader-writer. In particular, the embodiment of the application greatly simplifies the protocol. The selection instruction can be modified from an instruction of originally selecting a specific tag group to an instruction of selecting only a specific tag. Namely, under the condition that a plurality of radio frequency tags appear in the preset range, the radio frequency tag with the strongest signal is selected from the plurality of radio frequency tags to carry out read-write operation according to a selection instruction in a preset air interface protocol.

Optionally, the radio frequency reader/writer operates in a fixed frequency manner. Because the radio frequency reader-writer only works in one frequency band, the radio frequency reader-writer can be realized by a simple circuit without frequency hopping, and the cost is convenient to reduce.

In the embodiment of the application, the access instruction set can be modified to only include a block write instruction, and the instructions corresponding to other unnecessary functions are deleted. And the original frequency modulation working mode is changed into a fixed frequency working mode, so that the cost of the radio frequency reader-writer is reduced.

Since the air interface protocol is simplified, and the receiving sensitivity of the radio frequency front end part is weakened, the embodiment of the application can introduce the low-cost radio frequency reader-writer as shown in fig. 10.

Optionally, referring to fig. 10, which shows a block diagram of a structure of a radio frequency reader provided in an embodiment of the present application, the radio frequency reader 20 includes: a crystal oscillator 203, a microprocessor 204, a phase-locked loop 205, a modulation circuit 206, a carrier cancellation circuit 207, a power amplifier 208, a detection circuit 209, a forward coupling circuit 211 and a reverse coupling circuit 212; the crystal oscillator 203, the microprocessor 204, the phase-locked loop 205, the modulation circuit 206, the power amplifier 208, the forward coupling circuit 211 and the reverse coupling circuit 212 are connected in sequence; the microprocessor 204 is also connected with a modulation circuit 206 and a power amplifier 208 respectively; the forward coupling circuit 211 and the reverse coupling circuit 212 are connected to the detector circuit 209, the detector circuit 209 is connected to the carrier cancellation circuit 207, and the carrier cancellation circuit 207 is connected to the phase-locked loop 205.

The micro-processor, the phase-locked loop, the modulation circuit, the power amplifier, the forward coupling circuit and the backward coupling circuit form a radio frequency emission path, and the micro-strip line component forms a radio frequency emission path; the microprocessor, the phase-locked loop, the carrier cancellation circuit, the detection circuit, the forward coupling circuit, the reverse coupling circuit and the microstrip line component form a radio frequency receiving channel.

Under the action of the crystal oscillator 203, the microprocessor 204 controls the phase-locked loop 205 and the modulation circuit 206 to generate a first modulated carrier, and controls the power amplifier 208 to amplify and output the first modulated carrier; the amplified first modulated carrier is output to the microstrip line assembly through the forward coupling circuit 211 and the backward coupling circuit 212, and the microstrip line assembly radiates the first modulated carrier into the space within the preset range.

When the amplified first modulated carrier passes through the forward coupling circuit 211, the forward coupling circuit further outputs the first modulated carrier with preset power to the detector circuit 209.

And the radio frequency tag sends a second modulation carrier after receiving the first modulation carrier under the condition that the radio frequency tag of the carrier exists in the space in the preset range. The microstrip line assembly may then receive the second modulated carrier. The second modulated carrier wave is output to the detection circuit 209 via the back coupler 212.

In practical applications, when the microstrip line assembly radiates the first modulated carrier, the microstrip line assembly reflects the first modulated carrier, and the reflected first modulated carrier is transmitted to the detection circuit 209 through the inverse coupler 212.

The detection circuit 209 combines the first modulated carrier input by the forward coupling circuit 211, the first modulated carrier input by the backward coupler 212, and the second modulated carrier, and then outputs the combined carrier to the carrier cancellation circuit 207, and the carrier cancellation circuit 209 performs cancellation processing on the combined carrier to obtain a second modulated carrier, and then outputs the second modulated carrier to the microprocessor 204 via the phase-locked loop 205. The microprocessor 204 processes the second modulated carrier to obtain information of the radio frequency tag.

It is understood that the microprocessor 204 is configured to, under the action of the crystal oscillator 203, control the phase-locked loop 205 and the modulation circuit 206 to generate a first modulated carrier, and control the power amplifier 208 to amplify and output the first modulated carrier;

and the phase-locked loop 205 is used for generating a carrier wave of a target frequency based on the control of the microprocessor 204, processing the second carrier wave input by the carrier wave cancellation circuit and outputting the processed second carrier wave to the microprocessor 204. Wherein the target frequency is determined by the microprocessor based on the information it needs to transmit.

The modulation circuit 206 is configured to modulate a carrier wave of a target frequency input by the phase-locked loop 205 into a first modulated carrier wave based on the control of the microprocessor 204, and output the first modulated carrier wave to the power amplifier 208.

The power amplifier 208 is configured to amplify the power of the first modulated carrier and output the amplified power to the forward coupler 211 under the control of the microprocessor 204.

The forward coupler 211 is configured to output the first modulated carrier received from the power amplifier 208 to the backward coupler 212, and to couple the first modulated carrier with a predetermined power to the detector circuit 209.

The backward coupler 212 is configured to output the first modulated carrier received from the forward coupler 211 to the microstrip line assembly, output the first modulated carrier reflected by the microstrip line assembly to the detector circuit 209, and output the second modulated carrier transmitted by the microstrip line assembly to the detector circuit 209.

And a detector circuit 209 for combining the first modulated carrier input from the forward coupling circuit 211, the first modulated carrier input from the reverse coupling circuit, and the second modulated carrier, and outputting the combined carrier to the carrier cancellation circuit 207.

The detector circuit is used for carrying out demodulation processing on the received modulated carrier in the process of combining the carriers.

The carrier cancellation circuit 208 extracts the second modulated carrier from the carrier received from the detection circuit 209.

It can be understood that the first modulated carrier is a signal actively transmitted by the rf reader, and can be understood as a main carrier signal, and a signal transmitted by the rf tag can be understood as a sub-carrier signal. The carrier cancellation circuit 208 performs cancellation processing of the modulated carrier and the reverse power signal to obtain a subcarrier signal.

It should be noted that the tag reading process of the radio frequency reader-writer includes: under the action of a basic signal generated by a crystal oscillator, a microprocessor controls a phase-locked loop to send out a carrier signal of a target frequency, controls a modulation circuit to generate an amplitude keying modulation (Ask modulation) carrier, outputs the carrier signal to a space in a preset range through a microstrip line component after further amplification of a power amplifier to supply power to a radio frequency tag, and receives a subcarrier modulation signal sent by the radio frequency tag by a radio frequency reader-writer.

After further amplification by the power amplifier, a part of the modulated carrier leaks to the detector circuit through the forward coupling circuit. The carrier leaked to the detection circuit, the carrier sent by the microstrip line assembly and reflected back to the backward coupling circuit and the received subcarrier signal are combined by the detection circuit, only the subcarrier signal of the radio frequency tag is left after the combined signal passes through the carrier cancellation circuit, and the subcarrier signal of the radio frequency tag enters the microprocessor through the phase-locked loop, so that the process of reading the radio frequency tag is completed.

The label writing process of the radio frequency reader-writer comprises the following steps: the microprocessor controls the phase-locked loop to send out a carrier signal of a target frequency, controls the modulation circuit to generate an ASK modulation carrier, further amplifies the ASK modulation carrier through the power amplifier, sends the ASK modulation carrier to the space through the microstrip line assembly through the forward coupling circuit and the backward coupling circuit to supply power to the radio frequency tag, demodulates the received ASK modulation carrier after the radio frequency tag supplies power, and completes the writing of the radio frequency tag.

The radio frequency reader-writer avoids the radio frequency reader-writer in the prior art, avoids a mode of constructing a high-cost radio frequency reader-writer chip, uses a low-cost phase-locked loop and a modulation circuit to replace the phase-locked loop and the modulation circuit in the process of transmitting a carrier wave, avoids using a high-cost balun reader-writer matched with the radio frequency reader-writer chip in the process of receiving the carrier wave, utilizes a low-cost detection circuit and a carrier wave counteracting circuit to receive the carrier wave, and greatly reduces the cost of the radio frequency reader-writer as a whole.

Optionally, referring to fig. 1, the service end 50 may be a checkout server, and in a self-checkout scenario, the radio frequency reader 20 is configured to, after reading the tag information of the target radio frequency tag, send the tag information of the target radio frequency tag to the checkout server. And the checkout server performs checkout operation according to the third label information.

In the embodiment of the application, the radio frequency tag read-write device may also be applied to a self-checkout scene, where the self-checkout scene specifically means that one or more radio frequency tag read-write devices are arranged at places such as a mall and a shopping center to implement unmanned self-checkout, a radio frequency tag may be attached to the surface of a commodity, detailed information of the commodity is stored in the radio frequency tag, after the commodity is selected by a customer, the commodity may be taken to the radio frequency tag read-write device to perform one-to-one read-write checkout operation, after the tag information in the radio frequency tag of each commodity is read and written by the radio frequency reader-writer 20 of the radio frequency tag read-write device, the tag information may be sent to a checkout server, the checkout server may complete checkout operation on the commodity according to the tag information, and after the checkout operation is completed.

The payment operation of the payment server on the commodity may specifically include that after the payment server confirms that the label information of the commodity is correct, the payment server sends a payment page to a payment device, and the payment device displays the payment page on a display screen of the payment page. Specifically, the page may include a barcode generated based on the checkout link for the customer to check out the barcode, where the barcode may be a barcode or a two-dimensional code. Alternatively, the page may be used to prompt the customer to pay for the card. And after the user uses the terminal equipment to scan the bar code for payment, the checkout server confirms that checkout is finished, or after the user uses a bank card or a credit card to pay by swiping the card, the checkout server confirms that checkout is finished.

Specifically, in a self-service checkout scene, when a plurality of commodities exist, a customer has an operation of reading the commodities by a radio frequency reader-writer one by one, and radio frequency tags of the commodities are possibly in an electromagnetic field range and are close to the radio frequency reader-writer, so that in order to avoid the radio frequency reader-writer from reading the current radio frequency tag in series to other adjacent radio frequency tags, the radio frequency reader-writer can control each radio frequency tag receiving the query instruction to send a response signal to the radio frequency reader-writer at the same time through a query instruction with a time slot counting parameter of 0, under the condition, the radio frequency reader-writer can accurately determine a target radio frequency tag to perform read-write operation every time, and under the condition that the plurality of radio frequency tags obtain energy simultaneously, when the radio frequency reader-writer has a serial reading condition, and the commodity corresponding to the target radio frequency tag is closest to the radio frequency reader-writer, the commodity can be accurately determined as the radio frequency tag currently performing the reading operation by the radio frequency reader-writer.

In addition, in a self-service checkout scene, the method can also utilize the characteristic that the transmission line assembly can generate a traveling wave structure with stable field intensity and relatively fixed electromagnetic field range for surface wave transmission in a working state, so that the purpose of restricting the electromagnetic field range in the radio frequency tag reading-writing device is realized. Because the electromagnetic field generated by the transmission line assembly is restricted in a small range near the transmission line, other radio frequency tags near the radio frequency reader-writer can be prevented from obtaining energy at the same time, and the problem that the radio frequency reader-writer performs serial reading during checkout is solved.

To sum up, the radio frequency reader of the embodiment of the present application may control each radio frequency tag that receives the query instruction to simultaneously send a response signal to the radio frequency reader by using the query instruction having the time slot count parameter of 0, and in this case, the radio frequency tag with the strongest signal is selected from among the received response signals to perform reading and writing, so that the radio frequency reader may accurately determine a target radio frequency tag to perform reading and writing operations each time, thereby greatly reducing the situation that the radio frequency reader performs serial reading and serial writing under the condition that a plurality of radio frequency tags obtain energy simultaneously, so that the radio frequency reader does not need to pay attention to the radiation distance of an electromagnetic field in the internal design of the radio frequency tag reader, and therefore, an additional metal shielding shell does not need to be added in the radio frequency tag reader, and the design and hardware cost of the radio frequency tag reader is reduced.

In another embodiment provided in the present application, referring to fig. 2, the rf tag reading/writing apparatus includes: the radio frequency reader-writer comprises a box body 10, a radio frequency reader-writer 20 and a transmission line assembly 40, wherein the radio frequency reader-writer 20 and the transmission line assembly 40 are arranged in the box body 10; the radio frequency reader-writer 20 is connected with the transmission line assembly 40; the rf reader/writer 20 is configured to control the transmission line assembly 40 to generate an electromagnetic field with a strength reaching a preset threshold value in a preset range; the electromagnetic field is used for providing energy for the radio frequency tag 301 in a preset range; the rf reader/writer 20 is also configured to perform a read/write operation on the rf tag 301 when the tag paper 30 including the rf tag 301 is within a preset range.

Because the electromagnetic field generated by the microstrip line component is restricted in a very small range near the transmission line, and because the radiation range of the microstrip line is very small, under the condition that the radio frequency tags enter in a sequencing mode, only one radio frequency tag can enter at every time, so that only one radio frequency tag can be read and written, the radio frequency tags of a plurality of carriers which are connected in sequence can be prevented from obtaining energy at the same time, the problem of serial reading and serial writing of a radio frequency reader-writer is solved, the internal design of the radio frequency tag read-write device does not need to pay attention to the radiation distance of the electromagnetic field, and therefore, an additional metal shielding shell does not need to be added in the radio frequency tag read-write device, and the design and hardware cost of.

In this embodiment, referring to fig. 6, a schematic top view diagram of a radio frequency tag reading/writing apparatus provided in this embodiment is shown, where an interval between a conductor strip 401 of a microstrip line assembly 40 and a carrier 30 may be smaller than or equal to a preset distance value, and an electromagnetic field strength generated by the microstrip line assembly 40 needs to reach a preset threshold value, so as to ensure that a radio frequency tag 301 can obtain energy from an electromagnetic field. For example, the vertical distance between the conductor strip 401 of the microstrip line assembly 40 and the carrier in the preset range C is smaller than or equal to the preset distance value.

The method and the device can utilize the characteristic that the microstrip line component can generate a field intensity stable in a working state and the electromagnetic field range is relatively fixed, and the purpose of restricting the electromagnetic field range in the radio frequency tag reading and writing device is realized. Because the electromagnetic field generated by the microstrip line component is restricted in a very small range near the transmission line, the radio frequency tags of a plurality of carriers which are connected in sequence can be prevented from obtaining energy simultaneously, the problem of serial reading and serial writing of the radio frequency reader-writer can be further solved, the radio frequency reader-writer can perform read-write operation on a certain radio frequency tag more accurately, the radiation distance of the electromagnetic field does not need to be concerned in the internal design of the radio frequency tag read-write device, therefore, an additional metal shielding shell does not need to be added in the radio frequency tag read-write device, and the design and hardware cost of the radio frequency tag read-write device are reduced.

Alternatively, referring to fig. 3, the microstrip line assembly includes: substrate 403, conductor strip 401, matching load 402. The substrate 403 includes: the antenna comprises a metal layer 4031 and a dielectric layer 4032, wherein the dielectric layer 4032 is arranged on the surface of the metal layer 4031, the conductor strip 401, the radio frequency reader-writer 20 and the matching load 402 are arranged on one surface of the dielectric layer 4032, which is far away from the metal layer 4031; one end of the conductor strip 401 is connected with a radio frequency interface of the radio frequency reader-writer 20, and the other end of the conductor strip 401 is connected with a matched load 402; the rf reader/writer 20 is configured to supply power to the conductor strip 401 through the rf interface, so that the conductor strip 401 generates an electromagnetic field with a strength reaching a predetermined threshold. Specifically, reference may be made to the related description in the foregoing embodiments, and details are not repeated here.

Optionally, referring to fig. 8, which shows an assembly schematic diagram of another microstrip line assembly and a radio frequency reader/writer provided in the embodiment of the present application, the microstrip line assembly 40 further includes: rf cable 404, substrate 403 includes: a first substrate 4033 and a second substrate 4034, the conductor strip 401 comprising: a first conductor strip 4011 and a second conductor strip 4012; the first conductor strip 4011 and the radio frequency reader/writer 20 are provided on the first substrate 4033, and the second conductor strip 4012 and the matching load 403 are provided on the second substrate 4034; one end of the first conductor strip 4011 is connected to a radio frequency interface of the radio frequency reader/writer 20, one end of the first conductor strip 4011 is connected to one end of the radio frequency cable 404, the other end of the radio frequency cable 404 is connected to one end of the second conductor strip 4012, and the other end of the second conductor strip 4012 is connected to the matching load 402; the rf reader/writer 20 is configured to supply power to the first conductor strip 4011 through the rf interface, so that the second conductor strip 4012 generates an electromagnetic field with strength reaching a preset threshold. Specifically, reference may be made to the related description in the foregoing embodiments, and details are not repeated here.

Optionally, referring to fig. 2, the radio frequency tag reading/writing device further includes: a communication device 201; the rf reader 20 is specifically configured to, in a case of receiving preset communication information sent by the rf tag of the carrier, obtain, through the communication device 201, first tag information for the carrier from the server 50, and write the first tag information into the rf tag of the carrier. Specifically, reference may be made to the related description in the foregoing embodiments, and details are not repeated here.

Optionally, referring to fig. 6, the radio frequency reader 20 is further configured to receive second tag information sent by the radio frequency tag of the carrier B to be printed, where the second tag information is information sent by the radio frequency tag after the radio frequency tag acquires the first tag information; under the condition that the first label information is matched with the second label information, moving the carrier B to be printed out of the preset range C; and under the condition that the first label information is not matched with the second label information, writing the first label information into the radio frequency label of the carrier B to be printed again until the first label information is matched with the second label information. Specifically, reference may be made to the related description in the foregoing embodiments, and details are not repeated here.

And in the case that the first electronic product code and the second electronic product code do not match, rewriting the first tag information into the radio frequency tag of the carrier until the first electronic product code and the second electronic product code match. Specifically, reference may be made to the related description in the foregoing embodiments, and details are not repeated here.

Optionally, referring to fig. 2, the radio frequency tag reading/writing device further includes: the rotating shaft 101 and a rotating shaft controller (not shown in the figure), the rotating shaft controller is in communication connection with the radio frequency reader-writer 20, and the rotating shaft controller is used for controlling the rotating shaft 101 to rotate; the rotating shaft 101 is used for bearing a plurality of carriers 30 wound on the rotating shaft 101, the plurality of carriers 30 are sequentially connected, one end of the sequentially connected plurality of carriers 30 is fixedly arranged on the rotating shaft 101, and the other end of the sequentially connected plurality of carriers 30 is separated from the rotating shaft 101 and extends towards a direction facing a preset range; the rf reader is specifically configured to control the rotation shaft 101 to work through the rotation shaft controller, so as to sequentially move the plurality of carriers 30 into or out of the preset range. Specifically, reference may be made to the related description in the foregoing embodiments, and details are not repeated here.

Optionally, referring to fig. 5, the radio frequency tag reading/writing device further includes: a printing assembly 60; the printing assembly 60 is disposed facing the surface of the carrier 30; the printing component 60 is used for acquiring the printing information for the carrier 30 from the service end 50 and printing the printing information on the surface of the carrier 30. Specifically, reference may be made to the related description in the foregoing embodiments, and details are not repeated here.

Optionally, the radio frequency reader is specifically configured to perform a read-write operation on the radio frequency tag based on a block write instruction in a preset air interface protocol. Because the instruction set is simplified, the radio frequency reader-writer can be realized by a simple circuit without complex functions, and the cost is convenient to reduce. Specifically, reference may be made to the related description in the foregoing embodiments, and details are not repeated here.

Optionally, the radio frequency reader/writer operates in a fixed frequency manner. Because the radio frequency reader-writer only works in one frequency band, the radio frequency reader-writer can be realized by a simple circuit without frequency hopping, and the cost is convenient to reduce. Specifically, reference may be made to the related description in the foregoing embodiments, and details are not repeated here.

Optionally, referring to fig. 10, which shows a block diagram of a structure of a radio frequency reader provided in an embodiment of the present application, the radio frequency reader 20 includes: a crystal oscillator 203, a microprocessor 204, a phase-locked loop 205, a modulation circuit 206, a carrier cancellation circuit 207, a power amplifier 208, a detection circuit 209, a forward coupling circuit 211 and a reverse coupling circuit 212; the crystal oscillator 203, the microprocessor 204, the phase-locked loop 205, the modulation circuit 206, the power amplifier 208, the forward coupling circuit 211 and the reverse coupling circuit 212 are connected in sequence; the microprocessor 204 is also connected with a modulation circuit 206 and a power amplifier 208 respectively; the forward coupling circuit 211 and the reverse coupling circuit 212 are connected to the detector circuit 209, the detector circuit 209 is connected to the carrier cancellation circuit 207, and the carrier cancellation circuit 207 is connected to the phase-locked loop 205. The micro-processor, the phase-locked loop, the modulation circuit, the power amplifier, the forward coupling circuit and the backward coupling circuit form a radio frequency emission path, and the micro-strip line component forms a radio frequency emission path; the microprocessor, the phase-locked loop, the carrier cancellation circuit, the detection circuit, the forward coupling circuit, the reverse coupling circuit and the microstrip line component form a radio frequency receiving channel. Specifically, reference may be made to the related description in the foregoing embodiments, and details are not repeated here.

Optionally, the radio frequency reader/writer 20 is configured to send an inquiry instruction including a time slot count parameter of 0, and select a target radio frequency tag corresponding to a target response signal with the strongest signal strength to perform a read/write operation when receiving response signals sent by at least two radio frequency tags 301 in the same time slot; the time slot counting parameter of 0 is used to control at least two radio frequency tags 301 receiving the query instruction to send a response signal in the same time slot after receiving the query instruction. Specifically, reference may be made to the related description in the foregoing embodiments, and details are not repeated here.

Optionally, the radio frequency reader is specifically configured to: sending a query instruction with a time slot counting parameter of 0 according to a preset air interface protocol; under the condition that response signals containing random numbers and sent by at least two radio frequency tags in the same time slot are received, determining a target response signal with the strongest signal strength in the at least two response signals; sending a confirmation instruction comprising the target random number according to the target random number in the target response signal; the confirmation instruction is used for controlling the target radio frequency tag corresponding to the target random number to enter a working state; and performing reading operation or writing operation on the target radio frequency tag. Specifically, reference may be made to the related description in the foregoing embodiments, and details are not repeated here.

The radio frequency reader of the embodiment of the application can control each radio frequency tag receiving the query instruction to simultaneously send a response signal to the radio frequency reader by the query instruction including the time slot counting parameter of 0, and in this case, even if response signals sent by a plurality of radio frequency tags are received, the radio frequency tag with the strongest signal can be selected from the received response signals for reading and writing, therefore, the radio frequency reader-writer can accurately determine a target radio frequency tag to perform reading and writing operations each time, the situation that the radio frequency reader-writer performs serial reading and serial writing under the condition that a plurality of radio frequency tags obtain energy simultaneously is greatly reduced, so that the internal design of the radio frequency tag reading and writing device does not need to pay attention to the radiation distance of the electromagnetic field, therefore, an additional metal shielding shell is not required to be added in the radio frequency tag reading and writing device, and the design and hardware cost of the radio frequency tag reading and writing device is reduced. Optionally, the radio frequency reader is configured to, after reading the tag information of the target radio frequency tag, send the tag information of the target radio frequency tag to a checkout server.

The checkout operation of the commodity by the checkout server specifically may include that after the checkout server confirms that the label information of the commodity is correct, the checkout link is sent to a display screen near the radio frequency reader-writer, and the display screen may generate a two-dimensional code according to the checkout link to display the two-dimensional code for a customer to check out the code. Or prompt the customer to pay for the account by swiping a card, etc.

The method and the device can utilize the characteristics that the transmission line component can generate a field intensity stability in a working state, and the electromagnetic field range is relatively fixed, and the traveling wave structure of surface wave transmission realizes the purpose of restricting the electromagnetic field range in the radio frequency tag reading and writing device. Because the electromagnetic field generated by the transmission line assembly is restricted in a very small range near the transmission line, the radio frequency tags of a plurality of carriers which are connected in sequence can be prevented from obtaining energy at the same time, the problem of serial reading and serial writing of a radio frequency reader-writer is solved, and the radiation distance of the electromagnetic field is not required to be concerned in the internal design of the radio frequency tag read-write device, so that an additional metal shielding shell is not required to be added in the radio frequency tag read-write device, and the design and hardware cost of the radio frequency tag read-write device are reduced.

Referring to fig. 2, the label printer may specifically include: the system comprises a box body 10, a radio frequency reader-writer 20, a tag energy providing module 40 and a tag moving assembly; the tag moving assembly may be the rotating shaft 101 and the rotating shaft controller (not shown) in fig. 5, and the rf reader 20, the tag moving assembly and the tag energy providing module 40 are disposed in the case 10; the radio frequency reader-writer 20 is connected with a tag energy providing module 40; the radio frequency reader-writer 20 is configured to control the tag energy providing module 40 to generate an electromagnetic field with strength reaching a preset threshold; the electromagnetic field is used for providing energy for the radio frequency tag 301 in a preset range; the radio frequency reader-writer 20 is further configured to send an inquiry instruction including a time slot counting parameter of 0, and select a target radio frequency tag corresponding to a target response signal with the strongest signal strength to perform a read-write operation when receiving response signals sent by at least two radio frequency tags 301 in the same time slot; the label moving assembly is used for sequentially moving the plurality of carriers corresponding to the plurality of radio frequency labels into or out of a preset range; the time slot counting parameter of 0 is used to control at least two radio frequency tags 301 receiving the query instruction to send a response signal in the same time slot after receiving the query instruction.

In an implementation case of the embodiment of the present application, when the slot count parameter is 0, the slot count range corresponding to the slot count parameter is (0, 0), and therefore, when a plurality of radio frequency tags receive an inquiry command at the same time, the radio frequency tags must select a value of 0 in the same slot count range (0, 0), so that all of the radio frequency tags enter a response state and simultaneously respond to a response signal including the random number RN16 to the radio frequency reader/writer.

Optionally, the tag energy providing module 40 is a transmission line assembly, and the radio frequency reader 20 is connected to the transmission line assembly; the rf reader/writer 20 is configured to control the transmission line assembly to generate an electromagnetic field with a strength reaching the preset threshold value in a preset range.

In another implementation of the embodiment of the present application, the tag printer may utilize the characteristic that the transmission line assembly can generate a traveling wave structure with stable field strength and relatively fixed electromagnetic field range for surface wave transmission in a working state, so as to achieve the purpose of restricting the electromagnetic field range in the printer.

In summary, according to the response signal received by the radio frequency reader, because the target radio frequency tag corresponding to the target response signal with the strongest signal strength is usually closest to the radio frequency reader, the radio frequency reader can accurately determine one target radio frequency tag to perform read-write operation each time through the query instruction including the time slot counting parameter of 0, so that the situation that the radio frequency reader reads and writes serially is greatly reduced when a plurality of radio frequency tags obtain energy simultaneously. The internal design of the radio frequency tag reading and writing device does not need to pay attention to the radiation distance of an electromagnetic field, so that an additional metal shielding shell does not need to be added in the radio frequency tag reading and writing device, and the design and hardware cost of the radio frequency tag reading and writing device is reduced. In addition, the method and the device utilize the characteristic that the transmission line assembly can generate a traveling wave structure with stable field intensity and relatively fixed electromagnetic field range for surface wave transmission in a working state, and achieve the purpose of restricting the electromagnetic field range in the printer. Because the electromagnetic field generated by the transmission line assembly is constrained in a very small range near the transmission line, the radio frequency tags of a plurality of carriers which are connected in sequence can be prevented from obtaining energy at the same time, the problem of serial reading and serial writing of a radio frequency reader is solved, the radiation distance of the electromagnetic field is not required to be concerned for the internal design of the printer, an additional metal shielding shell is not required to be added in the printer, and the design and hardware cost of the printer is reduced.

Referring to fig. 5, the electronic surface sheet printer may specifically include: the system comprises a box body 10, a radio frequency reader-writer 20, a label energy providing module 40, a label moving assembly and a printing assembly 60; the label moving assembly can be a rotating shaft 101 and a rotating shaft controller in fig. 5, and the box body 10, the radio frequency reader-writer 20, the label energy providing module 40, the label moving assembly and the printing assembly 60 are arranged in the box body; the radio frequency reader-writer 20 is connected with a tag energy providing module 40; the radio frequency reader-writer 20 is configured to control the tag energy providing module 40 to generate an electromagnetic field with strength reaching a preset threshold; the electromagnetic field is used for providing energy for the radio frequency tag in a preset range; the radio frequency reader-writer 20 is further configured to send an inquiry instruction including a time slot counting parameter of 0, and select a target radio frequency tag corresponding to a target response signal with the strongest signal strength to perform a read-write operation when receiving response signals sent by at least two radio frequency tags 301 in the same time slot; the tag moving assembly is used for sequentially moving the plurality of carriers 30 corresponding to the plurality of radio frequency tags 301 into or out of a preset range; the printing assembly 60 is disposed facing the surface of the carrier; the printing component 60 is used for acquiring printing information aiming at the carrier 30 and printing the printing information on the surface of the carrier 30; the time slot counting parameter of 0 is used to control at least two radio frequency tags 301 receiving the query instruction to send a response signal in the same time slot after receiving the query instruction.

Specifically, the printing component 60 may establish a communication connection with the communication device 201, and the communication device 201 may obtain the printing information for the carrier 30 from the server 50, and forward the printing information to the printing component 60, so that the printing component 60 prints the printing information on the surface of the carrier 30. For example, when an express waybill carrier passes through the rf reader 20 and the transmission line assembly 40, the rf tag included in the express waybill carrier is written with the first tag information, and then when the express waybill carrier passes through the printing assembly 60, the printing assembly 60 may print all or part of the first tag information on the surface of the express waybill carrier, thereby completing the printing of the express waybill carrier.

In this application embodiment, printing component 60 can be thermal printer, and thermal printing technique is through beating printer head concora crush on the temperature sensing label, directly gives the temperature sensing carrier surface heating of outside transmission through the heat-generating body that beats on the printer head for scribble and be heated the blackish on the chemical coating on temperature sensing label surface, form the writing of printing, and thermal printing has fast, the noise is low, prints clearly, convenient to use's advantage, can print the carrier of width 4 inches and above.

In another implementation of the embodiment of the present application, the electronic surface sheet printer may utilize the characteristic that the transmission line assembly may generate a traveling wave structure transmitted by a surface wave with a stable field strength and a relatively fixed electromagnetic field range in a working state, so as to achieve the purpose of constraining the electromagnetic field range in the printer.

To sum up, the embodiment of the present application utilizes the characteristic that the transmission line assembly can generate a field intensity stable in a working state and the electromagnetic field range is relatively fixed, and the traveling wave structure of the surface wave transmission realizes the purpose of restricting the electromagnetic field range in the printer. Because the electromagnetic field generated by the transmission line assembly is constrained in a very small range near the transmission line, the radio frequency tags of a plurality of carriers which are connected in sequence can be prevented from obtaining energy at the same time, the problem of serial reading and serial writing of a radio frequency reader is solved, the radiation distance of the electromagnetic field is not required to be concerned for the internal design of the printer, an additional metal shielding shell is not required to be added in the printer, and the design and hardware cost of the printer is reduced.

In one embodiment provided herein, referring to fig. 11, a block diagram of a checkout device according to an embodiment of the present application is shown, the device comprising: a tag energy providing module 40, a radio frequency reader/writer 20 and a checkout station 80; the radio frequency reader-writer 20 and the tag energy providing module 40 are arranged on the settlement table 80, and the radio frequency reader-writer 20 is connected with the tag energy providing module 40; the radio frequency reader-writer 20 is configured to control the tag energy providing module 40 to generate an electromagnetic field with strength reaching a preset threshold value on the account table 80; the electromagnetic field is used for providing energy for a radio frequency tag 301 on the checkout stand 80, and the radio frequency tag 301 is arranged on the carrier 30; the radio frequency reader/writer 20 is configured to send an inquiry instruction including a time slot count parameter of 0, select a target radio frequency tag corresponding to a target response signal with the strongest signal strength to perform a reading operation when receiving a response signal sent by at least one radio frequency tag 301 in the same time slot, obtain third tag information of the target radio frequency tag, and send the third tag information to the checkout server 501. The checkout server 501 performs a checkout operation based on the third tag information.

In the embodiment of the present application, the checkout apparatus may be applied to a self-checkout scenario, specifically, one or more checkout devices are arranged at places such as shopping malls, shopping centers and the like to realize unmanned self-checkout, wherein, the carrier 30 may be a commodity, the surface of the commodity may be attached with a radio frequency tag 301, the radio frequency tag 301 stores the detailed information of the commodity, after the customer selects the commodity, the commodities can be placed on the checkout stand of the checkout device one by one, the read-write checkout operation of the radio frequency reader-writer 20 on the radio frequency tags is carried out, after the radio frequency reader-writer 20 reads and writes the tag information in the radio frequency tag 301 of each commodity, the tag information may be sent to the checkout server 501, the checkout server 501 may complete checkout operation on the commodity according to the tag information, and after the checkout operation is completed, the customer may take the commodity away.

The checkout operation of the checkout server 501 on the commodity may specifically include that after the checkout server 501 confirms that the received tag information of the commodity is correct, the checkout link is sent to the radio frequency reader/writer 20, the radio frequency reader/writer 20 generates the two-dimensional code 701 according to the checkout link and displays the two-dimensional code in the nearby display screen 70, and the display screen 70 may prompt a customer to perform code scanning checkout. In addition, when the card swiping device is present, the display screen 70 may prompt the customer to perform card swiping payment and the like.

In addition, in the embodiment of the present application, the checkout apparatus may use the transmission line assembly 40, and the specific transmission line structure is described in the above embodiment and will not be described in detail here.

In summary, the query instruction with the time slot counting parameter of 0 is utilized, and one target radio frequency tag is accurately determined to perform read-write operation each time, so that the situation that the radio frequency reader-writer is subjected to serial read and serial write is greatly reduced. The internal design of the settlement device does not need to pay attention to the radiation distance of the electromagnetic field, and the design and hardware cost of the settlement device are reduced.

In another embodiment provided by the present application, the tag energy providing module is a transmission line assembly, and the radio frequency reader is connected to the transmission line assembly; the radio frequency reader-writer is used for controlling the transmission line assembly to generate an electromagnetic field with the strength reaching the preset threshold value in the preset range of the checkout stand.

Specifically, the related description of the transmission line component may refer to the above embodiments, and is not repeated here.

In a self-checkout scenario, referring to fig. 11, the present application may also utilize the characteristic that the transmission line assembly 40 may generate a traveling wave structure with stable field strength and a relatively fixed electromagnetic field range in the operating state, so as to achieve the purpose of restricting the electromagnetic field range in the checkout stand 80 of the checkout apparatus. Specifically, the transmission line assembly 40 may be tightly attached to the working surface of the checkout stand 80, and by setting the size of the transmission line assembly 40, the range of the electromagnetic field generated by the transmission line assembly 40 may be restricted to the checkout range 801 of the checkout stand 80, so that when checkout is performed, only the rf tag of one commodity obtains the energy of the electromagnetic field, and the rf reader/writer 20 may process one commodity at a time. Because the electromagnetic field generated by the transmission line assembly 40 is restricted in a small range near the transmission line, other radio frequency tags near the radio frequency reader-writer 20 can be prevented from obtaining energy at the same time, and the problem that the radio frequency reader-writer 20 generates serial reading during checkout is solved.

It should be noted that, on the working surface of the checkout station 80, the checkout range 801 may be marked by a marking line or a marking map, so that the customer can directly see the checkout range 801 of the checkout station 80, which is convenient for the customer to perform the subsequent operation of placing the merchandise for checkout. In addition, when the customer places the commodity and performs payment, the radio frequency tag 301 of the commodity needs to be placed in close contact with the payment range 801, so that the probability that the radio frequency tag 301 acquires electromagnetic field energy is improved.

It should be noted that the transmission line assembly 40 is described with reference to the above embodiments, and will not be described in detail herein.

In addition, the radio frequency reader of the embodiment of the present application may be further configured to send an inquiry instruction including a time slot count parameter of 0, select a target radio frequency tag corresponding to a target response signal with the strongest signal strength to perform a reading operation when receiving a response signal sent by at least one radio frequency tag 301 in the same time slot, obtain third tag information of the target radio frequency tag, and send the third tag information to the checkout server 501. The above specific processing manner of the rf reader can be referred to the description of the above embodiments, and will not be described in detail here.

In summary, the size of the transmission line assembly is set, so that the range of the electromagnetic field generated by the transmission line assembly can be restricted to the checkout range of the checkout stand, and when checkout is performed, only the radio frequency tag of one commodity obtains the energy of the electromagnetic field, so that the radio frequency reader-writer can process one commodity at a time. Because the electromagnetic field generated by the transmission line assembly is restricted in a small range near the transmission line, other radio frequency tags near the radio frequency reader-writer can be prevented from obtaining energy at the same time, and the problem that the radio frequency reader-writer performs serial reading during checkout is solved.

In one embodiment provided herein, referring to fig. 12, a block diagram of a checkout system according to an embodiment of the present application is shown, the system comprising: a checkout server 501 and at least one checkout device as shown in fig. 11, wherein at least one checkout device is connected with the checkout server 501 in a communication way.

In the embodiment of the application, under the condition that a plurality of checkout devices exist in a self-checkout scene, each checkout device can be controlled to simultaneously send a response signal to the radio frequency reader-writer through an inquiry instruction with a time slot counting parameter of 0, under the condition, the radio frequency tag with the strongest signal is selected from the received response signals to read and write, so that the radio frequency reader-writer can accurately determine a target radio frequency tag to perform read-write operation each time, the condition that the radio frequency reader-writer of one checkout device serially reads the radio frequency tags of commodities of other checkout devices is greatly reduced, and the commodity corresponding to the target radio frequency tag is closest to the radio frequency reader-writer and can be accurately determined as the radio frequency tag currently performing the reading operation by the radio frequency reader-writer.

In a self-checkout scene, the size of the transmission line assembly is set for each checkout device, so that the range of an electromagnetic field generated by the transmission line assembly can be restricted in the checkout range of a checkout station of each checkout device, and when the checkout device performs checkout, only the radio frequency tag of one commodity obtains the energy of the electromagnetic field, so that the radio frequency reader-writer can process one commodity at a time. Because the electromagnetic field generated by the transmission line assembly is restricted in a small range near the transmission line, the radio frequency tag of the commodity which is read to other checkout devices in series by the radio frequency reader-writer of one checkout device can be avoided.

Referring to fig. 13, a flowchart illustrating steps of a radio frequency tag read-write method according to an embodiment of the present application is shown, where the radio frequency tag read-write method may include:

in step 110, the rf reader sends out an inquiry command including a slot count parameter of 0.

And step 120, selecting the target radio frequency tag corresponding to the target response signal with the strongest signal strength to perform read-write operation when the radio frequency reader-writer receives the response signals sent by at least two radio frequency tags in the same time slot.

The specific contents of step 110 to step 120 may refer to the related descriptions in the above-mentioned rf tag reading/writing device, and are not described herein again.

In addition, the method may further include:

the radio frequency reader-writer selects a target radio frequency tag corresponding to a target response signal with the strongest signal strength to perform reading operation, third tag information of the target radio frequency tag is obtained, and the third tag information is sent to a checkout server so that the checkout server can perform checkout operation according to the third tag information.

In summary, according to the radio frequency tag reading and writing method provided by the embodiment of the present application, for the response signal received by the radio frequency reader, because the target radio frequency tag corresponding to the target response signal with the strongest signal strength is usually closest to the radio frequency reader, the radio frequency reader can accurately determine one target radio frequency tag to perform reading and writing operations each time through the query instruction including the time slot counting parameter of 0, so that the situation that the radio frequency reader reads and writes serially is greatly reduced under the condition that a plurality of radio frequency tags obtain energy simultaneously. The internal design of the radio frequency tag reading and writing device does not need to pay attention to the radiation distance of an electromagnetic field, so that an additional metal shielding shell does not need to be added in the radio frequency tag reading and writing device, and the design and hardware cost of the radio frequency tag reading and writing device is reduced.

For the device embodiment, since it is basically similar to the method embodiment, the description is simple, and for the relevant points, refer to the partial description of the method embodiment.

Embodiments of the disclosure may be implemented as a system using any suitable hardware, firmware, software, or any combination thereof, in a desired configuration. Fig. 14 schematically illustrates an exemplary system (or apparatus) 1600 that can be used to implement various embodiments described in this disclosure.

For one embodiment, fig. 14 shows an exemplary system 1600 having one or more processors 1602, a system control module (chipset) 1604 coupled to at least one of the processor(s) 1602, a system memory 1606 coupled to the system control module 1604, a non-volatile memory (NVM)/storage 1608 coupled to the system control module 1604, one or more input/output devices 1610 coupled to the system control module 1604, and a network interface 1612 coupled to the system control module 1606.

The processor 1602 may include one or more single-core or multi-core processors, and the processor 1602 may include any combination of general-purpose or special-purpose processors (e.g., graphics processors, application processors, baseband processors, etc.). In some embodiments, the system 1600 can function as a browser as described in embodiments herein.

In some embodiments, system 1600 may include one or more computer-readable media (e.g., system memory 1606 or NVM/storage 1608) having instructions and one or more processors 1602, which in conjunction with the one or more computer-readable media, are configured to execute the instructions to implement modules to perform the actions described in this disclosure.

For one embodiment, the system control module 1604 may include any suitable interface controllers to provide any suitable interface to at least one of the processor(s) 1602 and/or any suitable device or component in communication with the system control module 1604.

The system control module 1604 may include a memory controller module to provide an interface to the system memory 1606. The memory controller module may be a hardware module, a software module, and/or a firmware module.

System memory 1606 may be used, for example, to load and store data and/or instructions for system 1600. For one embodiment, system memory 1606 may include any suitable volatile memory, such as suitable DRAM. In some embodiments, system memory 1606 may include double data rate type four synchronous dynamic random access memory (DDR4 SDRAM).

For one embodiment, the system control module 1604 may include one or more input/output controllers to provide an interface to the NVM/storage 1608 and input/output device(s) 1610.

For example, NVM/storage 1608 may be used to store data and/or instructions. The NVM/storage 1608 may include any suitable non-volatile memory (e.g., flash memory) and/or may include any suitable non-volatile storage device(s) (e.g., one or more Hard Disk Drives (HDDs), one or more Compact Disc (CD) drives, and/or one or more Digital Versatile Disc (DVD) drives).

NVM/storage 1608 may include storage resources that are physically part of the device on which system 1600 is installed or may be accessed by the device and not necessarily part of the device. For example, the NVM/storage 1608 may be accessed over a network via the input/output device(s) 1610.

Input/output device(s) 1610 can provide an interface for system 1600 to communicate with any other suitable devices, input/output devices 1610 can include communication components, audio components, sensor components, and the like. Network interface 1612 can provide an interface for system 1600 to communicate over one or more networks, and system 1600 can wirelessly communicate with one or more components of a wireless network according to any of one or more wireless network standards and/or protocols, such as access to a wireless network based on a communication standard, such as WiFi, 2G, or 3G, or a combination thereof.

For one embodiment, at least one of the processor(s) 1602 may be packaged together with logic for one or more controllers (e.g., memory controller modules) of the system control module 1604. For one embodiment, at least one of the processor(s) 1602 may be packaged together with logic for one or more controllers of the system control module 1604 to form a System In Package (SiP). For one embodiment, at least one of the processor(s) 1602 may be integrated on the same die with logic for one or more controllers of system control module 1604. For one embodiment, at least one of the processor(s) 1602 may be integrated on the same die with logic for one or more controllers of system control module 1604 to form a system on a chip (SoC).

In various embodiments, system 1600 may be, but is not limited to being: a browser, a workstation, a desktop computing device, or a mobile computing device (e.g., a laptop computing device, a handheld computing device, a tablet, a netbook, etc.). In various embodiments, system 1600 may have more or fewer components and/or different architectures. For example, in some embodiments, system 1600 includes one or more cameras, keyboards, Liquid Crystal Display (LCD) screens (including touch screen displays), non-volatile memory ports, multiple antennas, graphics chips, Application Specific Integrated Circuits (ASICs), and speakers.

Wherein, if the display includes a touch panel, the display screen may be implemented as a touch screen display to receive an input signal from a user. The touch panel includes one or more touch sensors to sense touch, slide, and gestures on the touch panel. The touch sensor may not only sense the boundary of a touch or slide action, but also detect the duration and pressure associated with the touch or slide operation.

The present application further provides a non-volatile readable storage medium, where one or more modules (programs) are stored in the storage medium, and when the one or more modules are applied to a terminal device, the one or more modules may cause the terminal device to execute instructions (instructions) of method steps in the present application.

In one example, an apparatus is provided, comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, wherein the processor implements a method as in an embodiment of the present application when executing the computer program.

There is also provided in one example a computer readable storage medium having stored thereon a computer program, characterized in that the program, when executed by a processor, implements a method as one or more of the embodiments of the application.

Although certain examples have been illustrated and described for purposes of description, a wide variety of alternate and/or equivalent implementations or calculations may be made to achieve the same objectives without departing from the scope of practice of the present application. This application is intended to cover any adaptations or variations of the embodiments discussed herein. Therefore, it is manifestly intended that the embodiments described herein be limited only by the claims and the equivalents thereof.

Claims

1. A radio frequency tag reader/writer, comprising:

2. The apparatus of claim 1, wherein the radio frequency reader is specifically configured to:

sending a query instruction with a time slot counting parameter of 0 according to a preset air interface protocol;

under the condition that response signals containing random numbers and sent by at least two radio frequency tags in the same time slot are received, determining a target response signal with the strongest signal strength in the at least two response signals;

sending a confirmation instruction comprising the target random number according to the target random number in the target response signal; the confirmation instruction is used for controlling the target radio frequency tag corresponding to the target random number to enter a working state;

and performing reading operation or writing operation on the target radio frequency tag.

3. The apparatus of claim 1, further comprising:

the radio frequency reader-writer is connected with the transmission line assembly;

and the radio frequency reader-writer is used for controlling the transmission line assembly to generate an electromagnetic field with the strength reaching the preset threshold value in the preset range.

4. The apparatus of claim 3, wherein the transmission line assembly comprises: any one of a microstrip line assembly, a stripline assembly, a parallel bifilar assembly, and a coplanar waveguide assembly.

5. The device according to any one of claims 1 to 4, wherein the radio frequency reader/writer is configured to, after reading the tag information of the target radio frequency tag, send the tag information of the target radio frequency tag to a checkout server, so that the checkout server performs a checkout operation.

6. The apparatus of claim 4, wherein in the case that the transmission line assembly is the microstrip line assembly, the microstrip line assembly comprises:

a substrate, a conductor strip, a matching load;

the substrate includes: the conductor strip, the radio frequency reader-writer and the matched load are respectively arranged on one surface of the dielectric layer, which is far away from the metal layer;

one end of the conductor strip is connected with a radio frequency interface of the radio frequency reader-writer, and the other end of the conductor strip is connected with the matched load;

and the radio frequency reader-writer is used for supplying power to the conductor strip through the radio frequency interface so as to enable the conductor strip to generate an electromagnetic field with the strength reaching the preset threshold value.

7. The apparatus of claim 6, wherein the microstrip-line assembly further comprises: a radio frequency cable, the substrate comprising: a first substrate and a second substrate, the conductor strip comprising: a first conductor strip and a second conductor strip;

the first conductor strip and the radio frequency reader-writer are arranged on the first substrate, and the second conductor strip and the matching load are arranged on the second substrate; one end of the first conductor strip is connected with a radio frequency interface of the radio frequency reader-writer, one end of the first conductor strip is connected with one end of the radio frequency cable, the other end of the radio frequency cable is connected with one end of the second conductor strip, and the other end of the second conductor strip is connected with the matching load;

the radio frequency reader-writer is used for supplying power to the first conductor strip through the radio frequency interface so as to enable the second conductor strip to generate an electromagnetic field with the strength reaching the preset threshold value.

8. The apparatus of any one of claims 1-7, further comprising: a communication device;

the radio frequency reader-writer is specifically used for acquiring first label information from a server through the communication device; and writing the first tag information into the target radio frequency tag.

9. The apparatus of any of claims 1-7, wherein the radio frequency reader is further configured to,

receiving second label information sent by the target radio frequency label; the second tag information is information sent by the target radio frequency tag after the target radio frequency tag acquires the first tag information;

under the condition that the first label information is matched with the second label information, moving the carrier corresponding to the target radio frequency label out of the preset range;

and under the condition that the first label information is not matched with the second label information, rewriting the first label information into the target radio frequency label until the first label information is matched with the second label information.

10. The apparatus of claim 9, wherein the radio frequency reader is specifically configured to,

before the first label information is written into the target radio frequency label, encrypting the first label information and generating a first electronic product code;

adding the first electronic product code to the first tag information;

after second label information sent by the target radio frequency label is received, a second electronic product code of the second label information is obtained; the second tag information is information sent by the target radio frequency tag after the target radio frequency tag acquires the first tag information;

under the condition that the first electronic product code is matched with the second electronic product code, moving the carrier corresponding to the target radio frequency tag out of the preset range;

and under the condition that the first electronic product code and the second electronic product code are not matched, rewriting the first label information into the target radio frequency label until the first electronic product code and the second electronic product code are matched.

11. The apparatus of claim 9 or 10, further comprising:

the rotating shaft controller is in communication connection with the radio frequency reader-writer and is used for controlling the rotating shaft to rotate; the rotating shaft is used for bearing a plurality of carriers wound on the rotating shaft, and the carriers are connected in sequence;

one ends of the sequentially connected carriers are fixedly arranged on the rotating shaft, and the other ends of the sequentially connected carriers are separated from the rotating shaft and extend towards the direction facing the preset range;

the radio frequency reader-writer is specifically configured to control the rotation shaft to work through the rotation shaft controller, so as to move the plurality of carriers into or out of the preset range in sequence.

12. The apparatus according to any of claims 1 to 7, wherein the radio frequency reader is specifically configured to perform a read/write operation on the radio frequency tag based on a block write command in the preset air interface protocol.

13. The device of any one of claims 1-7, wherein the radio frequency reader operates in a fixed frequency manner.

14. The apparatus of any one of claims 1-7, wherein the radio frequency reader comprises: the device comprises a crystal oscillator, a microprocessor, a phase-locked loop, a modulation circuit, a carrier cancellation circuit, a power amplifier, a detection circuit and a coupling circuit, wherein the coupling circuit comprises a forward coupling circuit and a reverse coupling circuit;

the crystal oscillator, the microprocessor, the phase-locked loop, the modulation circuit, the power amplifier, the forward coupling circuit and the reverse coupling circuit are sequentially connected; the microprocessor is also connected with the modulation circuit and the power amplifier respectively;

the forward coupling circuit and the reverse coupling circuit are respectively connected with the detection circuit, the detection circuit is connected with the carrier cancellation circuit, and the carrier cancellation circuit is connected with the phase-locked loop;

the microprocessor is used for controlling the phase-locked loop and the modulation circuit to generate a modulation carrier wave and controlling the power output of the power amplifier under the action of the crystal oscillator;

the phase-locked loop is used for generating a high-frequency carrier signal;

the power amplifier is used for amplifying the carrier power of the modulated carrier;

the coupling circuit is used for carrying out forward power and reverse power coupling extraction operation on the modulated carrier;

the detection circuit is used for demodulating the received modulated carrier;

the carrier cancellation circuit is used for realizing cancellation processing of the modulated carrier and the reverse power signal to obtain a subcarrier signal.

15. The apparatus of any one of claims 1-8, further comprising:

a printing assembly;

the printing assembly is arranged facing to the surface of the carrier corresponding to the radio frequency label;

the printing component is used for acquiring printing information aiming at the carrier from a server side and printing the printing information on the surface of the carrier.

16. A label printer, comprising:

the device comprises a box body, a radio frequency reader-writer, a tag energy providing module and a tag moving assembly; the radio frequency reader-writer, the tag moving assembly and the tag energy providing module are arranged in the box body; the radio frequency reader-writer is connected with the tag energy providing module;

17. The label printer as in claim 16, wherein said label energy providing module is a transmission line assembly, said rf reader connected to said transmission line assembly;

the radio frequency reader-writer is used for controlling the transmission line assembly to generate an electromagnetic field with the strength reaching the preset threshold value in a preset range.

18. An electronic sheet printer, comprising:

19. The electronic surface sheet printer of claim 18, wherein the tag energy providing module is a transmission line assembly, the rf reader being connected to the transmission line assembly;

20. A checkout device, comprising: the tag energy providing module, the radio frequency reader-writer and the account settling station;

21. The apparatus of claim 20, wherein the tag energy providing module is a transmission line assembly, and the rf reader is connected to the transmission line assembly;

the radio frequency reader-writer is used for controlling the transmission line assembly to generate an electromagnetic field with the strength reaching the preset threshold value in the preset range of the account settling station.

22. A checkout system, comprising: a checkout server and at least one checkout device according to any of claims 20 to 21, the at least one checkout device being communicatively coupled to the checkout server; and the checkout server performs checkout operation according to the third label information.

23. A radio frequency tag reading and writing method is characterized by comprising the following steps:

24. An apparatus comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor implements the method of claim 23 when executing the computer program.

25. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the method of claim 23.