JP2007241940A - Converter of radio frequency and communication procedure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide operation environment in which resources can effectively at low cost in combination with the existing reader/writer, and only a single reader/writer may be managed even in a host information system. <P>SOLUTION: This converter of the radio frequency and communication processes has: an antenna 201 for radio communication with the reader/writer 10; an antenna 205 for radio communication with an electronic tag 30; a modulation/demodulation part 202 which modulates and demodulates carrier wave for radio communication with the reader/writer 10; a modulation/demodulation part 204 which modulates and demodulates the carrier wave for radio communication with the electronic tag 30 and a conversion part 203 which receives an instruction of the reader/writer 10 by digital data demodulated by the modulation/demodulation part 202, converts the received instruction into a form suitable for the electronic tag 30, demodulates the instruction by a modulation/demodulation part 204, transmits it to the electronic tag 30, receives response data from the electronic tag 30 by the digital data demodulated by the modulation/demodulation part 204, converts the received response data into a form suitable for the reader/writer 10 and transmits the response data to the reader/writer 10 by the modulation carrier wave of the modulation/demodulation part 202. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a radio frequency that is interposed between an electronic tag reader / writer and an electronic tag that is not originally supported by the reader / writer, and enables communication between the reader / writer and the electronic tag that is not originally supported by the reader / writer. And a communication procedure conversion apparatus.

  Conventionally, reading and writing of an electronic tag requires a reader / writer whose frequency and communication procedure correspond to the electronic tag. Therefore, when using different types of electronic tags, it is necessary to prepare reader / writers for each of the electronic tags or to prepare reader / writers corresponding to each of a plurality of methods. For example, Patent Document 1 discloses a reader / writer corresponding to three types of frequencies.

JP 2001-291079 A (page 25, FIG. 2)

  As described above, conventionally, in an operating environment in which electronic tags of different methods are mixed, it is necessary to prepare a reader / writer corresponding to each method, which increases the cost of equipment required for this, and also the reader / writer. However, there is a problem that the cost for dividing the management share of the reader / writer in the higher-level information system using the system increases and the management share becomes complicated.

  In addition, in the reader / writer corresponding to each of the plurality of methods, the cost of the software installed in the reader / writer device increases, and the corresponding method is incorporated and fixed in the system, so that it lacks flexibility, and as a result, There was a problem that overspec and waste increased.

  The present invention has been made to solve the above-described problems, and can be used in combination with an existing reader / writer so that flexible operation is possible. The purpose is to provide an operational environment that can be utilized and can be managed by a single reader / writer even in a host information system.

An apparatus for converting a radio frequency and a communication procedure according to the present invention includes a first antenna for performing radio communication with a reader / writer having an antenna,
A second antenna for wireless communication with the electronic tag;
A first modem unit having a function of modulating and demodulating a carrier wave for wireless communication with the reader / writer;
A second modem unit having a function of modulating and demodulating a carrier wave for wireless communication with the electronic tag;
An instruction issued by the reader / writer is received as digital data demodulated by the first modem, and the received instruction is converted into a format suitable for the electronic tag, and a communication procedure is generated to convert the converted instruction A carrier wave for performing wireless communication with the reader / writer modulated by the second modem unit is transmitted to the electronic tag, and response data from the electronic tag is received as digital data demodulated by the second modem unit. Then, the received response data is converted into a format and communication procedure suitable for the reader / writer, and is transmitted to the reader / writer using a carrier wave for wireless communication with the reader / writer modulated by the first modem unit. A conversion unit;
It is equipped with.

  According to the conversion device for radio frequency and communication procedure according to the present invention, when an electronic tag having a different frequency or communication procedure is newly added in an existing electronic tag application system, a conversion device corresponding to the added electronic tag is prepared. However, it can be used in combination with existing reader / writers, and it eliminates the need for new reader / writer devices, software installed in reader / writer devices, and processing in higher-level information systems. It is possible to construct a flexible information system that can select and use the electronic tag.

A radio frequency and communication procedure conversion device according to the present invention will be described below with reference to the drawings.
Embodiment 1 FIG.
FIG. 1 is a block diagram showing a first embodiment of a radio frequency and communication procedure converter according to the present invention, and FIG. 2 is a block diagram showing a converter unit in FIG. 1, and FIGS. FIG. 5 is a flowchart showing the operation of the conversion device unit.

  As shown in FIG. 1, the radio frequency and communication procedure conversion device 20 according to the first embodiment has a function capable of communicating with the reader / writer 10 and the electronic tag 30 having an antenna.

  The reader / writer 10 is a reader / writer 10 that performs communication at a carrier frequency of 125 KHz, 13.56 MHz, or 2.45 GHz, for example. The electronic tag 30 is an electronic tag that performs communication at a carrier frequency such as 125 KHz, 13.56 MHz, or 2.45 GHz. Here, the carrier frequency of the reader / writer 10 and the carrier frequency of the electronic tag 30 are different. For example, the carrier frequency of the reader / writer 10 is 13.56 MHz, and the carrier frequency of the electronic tag 30 is 125 KHz.

  For example, the conversion device 20 communicates with the reader / writer 10 at a carrier frequency of 13.56 MHz, receives an instruction (command) issued by the reader / writer 10, and converts the received command into a format suitable for the electronic tag 30. Communicate with the electronic tag at a carrier frequency of 125 KHz, and transmit the converted command to the electronic tag 30. Response data from the electronic tag 30 follows the reverse procedure, and is transmitted to the reader / writer 10 via the conversion device 20 at a carrier frequency of 13.56 MHz. The reader / writer 10 that communicates at 13.56 MHz can transmit a command and receive a response as if the electronic tag 30 that communicates at 125 KHz is an electronic tag that communicates at 13.56 MHz.

  As shown in FIG. 2, the conversion device 20 includes an antenna unit (first antenna unit) 201 on the reader / writer 10 side, a modem unit (first modem unit) 202 and a converter unit 203 on the reader / writer 10 side, and an electronic tag. A modulation / demodulation unit (second modulation / demodulation unit) 204 on the 30 side and an antenna unit (second antenna unit) 205 on the electronic tag 30 side. The conversion unit 203 of the conversion device 20 includes a microprocessor, a memory, and the like, and realizes its function by executing a program recorded in the memory by the microprocessor.

  When the reader / writer 10 issues a command, performs processing in the conversion device 20 and communicates with the electronic tag 30 and returns a response to the reader / writer 10, it takes a longer time than communicating directly with the electronic tag 30 from the reader / writer 10. Cost. For this reason, the command issued by the reader / writer 10 and the response of the conversion device 20 cannot be synchronized, and the reader / writer 10 determines that the electronic tag does not exist, and an error occurs at the first time. Therefore, the conversion device 20 starts processing from the first command issuance of the reader / writer 10 and waits for the retry of the reader / writer 10 from when the response is returned to the reader / writer 10, and responds in synchronization with the retry. By returning, the operation as the conversion device 20 is enabled.

  The antenna unit 201 is for performing wireless communication with the reader / writer 10. The modem unit 202 demodulates the carrier wave modulated with the digital data received from the reader / writer 10, converts it to digital data, inputs it to the conversion unit 203, and conversely modulates it with the digital data from the conversion unit 203. The carrier wave to the reader / writer 10 is converted and transmitted to the reader / writer 10.

  Similarly, the antenna unit 205 is for performing wireless communication with the wireless tag 30. The modulation / demodulation unit 204 demodulates the carrier wave modulated with the digital data received from the electronic tag 30 and converts it to digital data, inputs the digital data to the conversion unit 203, and conversely modulates with the digital data from the conversion unit 203. Then, it is converted into a carrier wave for the electronic tag 30 and transmitted to the electronic tag 30.

  As shown in FIG. 3, the conversion unit 203 generates a data format conversion and command communication procedure, and waits to receive a command from the reader / writer 10 (step S101), and the received data is an ID read command. If so (step S102), a tag ID (A11) reading process is performed (step S103).

  In step S103 of FIG. 3, as shown in FIG. 4, the conversion unit 203 generates a read instruction of the tag ID (A11) for reading the tag ID of the electronic tag 30 and transmits it to the electronic tag 30 (step S111). The tag ID returned from the electronic tag 30 is received (step S112), the received tag ID is adjusted to the length of the tag ID (A12) that matches the reader / writer 10 (step S113), and the reader / writer 10 The adjusted tag ID is transmitted to the reader / writer 10 in synchronization with the retry operation of the ID read command (step S114).

In step S113 in FIG. 4, as shown in FIG. 5, the conversion unit 203 determines the length of the tag ID (A11) of the electronic tag 30 corresponding to the reader / writer 10 and the length of the tag ID to be returned to the reader / writer 10. If the tag ID (A11) and the length of the tag ID returned to the reader / writer 10 are the same, nothing is done, and the length of the tag ID (A11) of the electronic tag 30 is sent to the reader / writer 10. If it is shorter than the length of the tag ID to be returned, 0 bit data is added to the upper part of the tag ID (A11) so as to be the same length as the tag ID to be returned to the reader / writer 10 (step S122). If the length of the tag ID (A11) is longer than the length of the tag ID returned to the reader / writer 10, the tag is set to have the same length as the tag ID returned to the reader / writer 10. D (A11) to remove the bit data from the upper generate tags ID (A12) adjusted length of (step S123).
In this case, it should be noted that there may be a plurality of electronic tags 30 having the same unique identification number.

  According to the first embodiment, by configuring as described above, it is possible to read the ID of the electronic tag between the reader / writer 10 and the electronic tag 30 having different communication frequencies and communication protocols.

Embodiment 2. FIG.
FIG. 6 is a block diagram showing Embodiment 2 of the conversion apparatus for radio frequency and communication procedure according to the present invention. FIGS. 7, 8, 9, 10 and 11 show the conversion apparatus in FIG. It is a flowchart which shows operation | movement.

As shown in FIG. 6, in the second embodiment, the data storage unit 211 is added to the configuration of the first embodiment (see FIG. 2). By adding the data storage unit 211, an electronic tag having a readable / writable memory can be targeted.
The operations of the antennas 101 and 105 and the modems 202 and 204 of the conversion device 20 are the same as those in the first embodiment.

As shown in FIG. 7, the conversion unit 203 waits to receive a command from the reader / writer 10 (step S201), and performs each process based on the received command (step S202).
In the case of an ID read command, the tag ID (A11) is read by the operation of the flowchart of FIG. 4 (step S203).
In the case of a data read command, data read processing from the electronic tag 30 is performed (step S204).
In the case of a data write command, write data is continuously received from the reader / writer 10 and stored in the data storage unit 211, and then data is written to the electronic tag 30 (step S206).

  In step S204 in FIG. 7, as shown in FIG. 8, the conversion unit 203 generates a data read command for the electronic tag 30 and transmits it to the electronic tag 30 (step S211), and receives it from the electronic tag 30 (S212). The tag read data A21 of the response is stored in the data storage unit 211 (step S213), the length of the tag read data A21 is adjusted (step S214), and synchronized with the retry operation of the data read command from the reader / writer 10. Then, the tag read data A22 whose length has been adjusted is transmitted to the reader / writer 10 (step S215).

  In step S214 in FIG. 8, as shown in FIG. 9, the address space of the tag read data A21 returned to the reader / writer 10 is compared with the address space of the electronic tag 30 (step S221), and the result is returned to the reader / writer 10. If the address space of the tag read data A21 and the address space of the electronic tag 30 are the same or the address space of the electronic tag 30 is larger, nothing is done, and the address space of the electronic tag 30 is smaller. In this case, read data A22 whose length is adjusted by setting the data in the address space that does not exist in the electronic tag 30 out of the address space of the read data A21 that needs to be returned to the reader / writer 10 is generated (step S222).

  In step S206 in FIG. 7, as shown in FIG. 10, the length of the tag write data A23 stored in the data storage unit 211 is adjusted (step S231), and a data write command for the electronic tag 30 is generated. A data write command is transmitted to the electronic tag 30 together with the write data to perform writing (step S232). The response received from the electronic tag 30 (step S233) is transmitted to the reader / writer 10 in synchronization with the retry operation of the data write command from the reader / writer 10 (step S234).

In step S231 in FIG. 10, as shown in FIG. 11, the address space of the write data A23 received from the reader / writer 10 is compared with the address space of the electronic tag 30 (step S241), and the received write data A23 is received. If the address space of the electronic tag 30 is the same as the address space of the electronic tag 30 or the address space of the electronic tag 30 is larger, nothing is done, and if the address space of the electronic tag 30 is smaller, it is received. Data in the address space that does not exist in the electronic tag 30 in the address space of the write data A23 is deleted (step S242).
In this case, application of this conversion device requires caution.
Further, when writing to an address space that does not exist in the electronic tag 30 occurs, an error may be returned to the reader / writer 10.

  According to the configuration of the second embodiment, the reader / writer 10 and the electronic tag 30 having different communication frequencies and communication protocols are targeted for the electronic tag 30 having a readable / writable memory as well as the electronic tag 30 that only reads the ID. The ID of the electronic tag can be read and the data can be read and written between.

Embodiment 3 FIG.
FIG. 12 is a block diagram showing Embodiment 3 of the conversion apparatus for radio frequency and communication procedure according to the present invention, and FIG. 13, FIG. 14, FIG. 15, FIG. 16, FIG. It is a flowchart which shows operation | movement of the converter in FIG.

As shown in FIG. 12, in the third embodiment, a state control unit 221, a collision prevention control unit 222, and an ID storage unit 223 are added to the configuration of the second embodiment (see FIG. 7). . By adding the state control unit 221, the collision prevention control unit 222, and the ID storage unit 223, the electronic tag 30 corresponding to the collision prevention protocol can be targeted.
The operations of the antennas 101 and 105 and the modems 202 and 204 of the conversion device 20 are the same as those in the first embodiment.

  The state control unit 221 analyzes the data received from the reader / writer 10 and controls the entire control unit of the conversion device 20. In the state of executing the collision prevention protocol, control is passed to the collision prevention control unit 222. After the electronic tag 30 to be accessed is selected and data reading / writing occurs, control is passed to the conversion unit 203.

Depending on whether each of the reader / writer 10 and the electronic tag 30 supports the collision prevention function, the processing of the conversion device 20 is divided into the following four types (1) to (4).
(1) The reader / writer 10 and the electronic tag 30 do not support the collision prevention function.
This is the same as the first embodiment and the second embodiment.
(2) The reader / writer 10 does not support the collision function, and the electronic tag 30 supports the collision function.
When there are a plurality of electronic tags 30, the plurality of electronic tags 30 and the conversion device 20 can communicate with each other, but the reader / writer 10 cannot cope with them, so that the communication cannot be performed.
(3) The reader / writer 10 corresponds to the collision function, and the electronic tag 30 does not correspond to the collision function.
When there are a plurality of electronic tags 30, the conversion device 20 and the electronic tag 30 cannot communicate with each other, and therefore cannot communicate.
(4) The reader / writer 10 and the electronic tag 30 both support the collision function.
Communication is also possible when there are a plurality of electronic tags 30.
The above (2) to (4) will be described below.

When the reader / writer 10 of (2) does not support the collision function and the electronic tag 30 supports the collision function,
As shown in FIG. 13, the operation of the state control unit 221 receives and waits for a command from the reader / writer 10 (step S301), and performs processing based on the received command (step S302).
The commands transmitted from the reader / writer 10 are ID reading, data reading, and data writing.

  In the case of an ID read command, a collision prevention protocol is executed for the electronic tag 30 (step S303). At this time, if the detected electronic tag 30 is one, it is determined as the tag ID (A31). When the tag ID (A31) is confirmed (step S304), the tag ID (A31) is transmitted to the reader / writer 10 in synchronization with the retry operation of the tag ID read command from the reader / writer 10 (step S305).

  In the case of a data read command, a collision prevention protocol is executed for the electronic tag 30 (step S306). If one electronic tag 30 is detected and the tag ID (A31) is determined (step S307), tag selection of the determined electronic tag 30 is executed (step S308), and data reading processing of the electronic tag 30 is performed.

  In the case of the data write command, the write data is received from the reader / writer 10 following the data write command, stored in the data storage unit 211 (step S310), and then the collision prevention protocol is executed for the electronic tag 30 (step S311). If one electronic tag 30 is detected and the tag IDA 31 is confirmed (step S312), tag selection of the confirmed electronic tag 30 is executed (step S313), and data stored in the data storage unit 211 is written. (Step S314).

  As for the collision prevention protocol processing for the electronic tag 30 (steps S303, S306, and S311 in FIG. 13), as shown in FIG. 14, the ID storage unit 223 is cleared (step S321), and the previous ID information is deleted. . A collision prevention protocol is executed for the electronic tag 30 (step S322), and the tag IDs of the detected electronic tags 30 are sequentially stored in the ID storage unit 223 (step S323). If the number of detected electronic tags 30 is one (step S324), the tag IDA 31 is determined by regarding it as a target for future processing (step S325. If a plurality of detected electronic tags 30 or not detected, collision prevention is performed. Since the reader / writer 10 that does not support the function cannot communicate originally, the tag ID is not determined and the reader / writer 10 does not respond.

When the reader / writer 10 of (3) corresponds to the collision function and the electronic tag 30 does not support the collision function,
As shown in FIG. 15, the operation of the state control unit 221 waits for a command from the reader / writer 10 (step S401), and performs processing based on the received command (step S402).
The commands transmitted from the reader / writer 10 are ID reading, data reading, and data writing.

  In the case of a collision prevention protocol command, the collision prevention protocol is processed (step S403). In the case of the electronic tag 30 selection command, tag selection processing is performed in the ID storage unit 223 (step S404). If a tag is selected in the ID storage unit 223, the tag IDA 42 is determined.

  In the case of a data read command, if the tag ID (A21) is confirmed (step S405), data is read from the confirmed electronic tag 30 (step S406). Step S406 is as described in FIG. 8 of the second embodiment.

  In the case of a data write command, if the tag ID (A23) is confirmed (step S407), the write data is received from the reader / writer 10 following the data write command and stored in the data storage unit 211 (step S408), and thereafter Then, data writing processing is performed on the determined electronic tag 30 (step S409). Step S409 is as described in FIG. 10 of the second embodiment.

  As for the process of the collision prevention protocol in FIG. 15 (step S403), as shown in FIG. 16, the ID storage unit is cleared (step S411), and the previous ID information is erased. When the tag ID of the electronic tag 30 is read (step S412) and the tag ID is read from the electronic tag 30 (step S413), the detected tag ID of the electronic tag 30 is stored in the ID storage unit 223 (step S414) and detected. Using the tag ID, the collision prevention protocol response is executed to the reader / writer 10 in synchronization with the retry of the collision prevention protocol from the reader / writer 10 (step S415). If a plurality of electronic tags 30 are detected, the reader / writer 10 cannot read the tag ID, so that no response is returned to the reader / writer 10 and the reader / writer 10 behaves such that the electronic tag 30 does not exist. .

  As for the tag selection process (step S404) in FIG. 15, as shown in FIG. 17, the ID storage unit 223 is searched (step S421), and if there is a corresponding tag ID (step S422), it is processed in the future. (Step S423) and a response is transmitted to the reader / writer 10 (step S424).

When both the reader / writer 10 and the electronic tag 30 of the above (4) support the collision function,
As shown in FIG. 18, it waits for a command from the reader / writer 10 (step S501), and performs processing based on the received command (step S502).
The commands transmitted from the reader / writer 10 are ID reading, data reading, and data writing.

  In the case of a collision prevention protocol command, the collision prevention protocol is processed (step S503). In the case of an electronic tag 30 selection command, tag selection processing is performed in the ID storage unit 223 (step S504). Step S504 is as described with reference to FIG. 17 in the case of (3) above. If the tag ID (A42) is selected in the ID storage unit 223, the tag ID (A42) is in a definite state.

  In the case of a data read command, if the tag ID is fixed (step S505), the electronic tag 30 is selected (step S506), and the data is read from the electronic tag 30 with the selected tag ID (A21). Is performed (step S507). Step S507 is as described in FIG. 8 of the second embodiment.

  In the case of a data write command, if the tag ID is fixed (step S508), the write data is received from the reader / writer 10 following the data write command and stored in the data storage unit 211 (step S509), and then the electronic tag 30 Is selected (step S510), and data is written into the electronic tag 30 with the selected tag ID (A23) (step S511). Step S511 is as described in FIG. 10 of the second embodiment.

  As for the process of the collision prevention protocol in FIG. 18 (step S503), as shown in FIG. 19, the ID storage unit is cleared (step S521), and the previous ID information is erased. The tag ID of the electronic tag 30 is read (step S522), and the tag IDs of one or more electronic tags 30 detected during the collision protocol with the electronic tag 30 are sequentially stored in the ID storage unit 223 (step S523). If the number of saved tag IDs is one or more (step S524), a response of the collision prevention protocol is executed in synchronization with the retry of the collision prevention protocol from the reader / writer 10 using the tag ID (step S525).

  According to the configuration of the third embodiment, in addition to the tag ID reading and data reading / writing functions of one electronic tag 30, the communication frequency and the reader / writer 10 and the electronic tag 30 having a collision prevention function are targeted. Between the reader / writer 10 and the electronic tag 30 having different communication protocols, it is possible to simultaneously read the tag IDs and read / write data of the plurality of electronic tags 30.

Embodiment 4 FIG.
FIG. 20 is a block diagram showing Embodiment 4 of the radio frequency and communication procedure converting apparatus according to the present invention.

  In the first to third embodiments, the conversion device 20 is interposed in the space between the reader / writer 10 and the electronic tag 30. As shown in FIG. It may be attached to the antenna of the writer 10 to form an integrated configuration.

By using the entire conversion device 20 and the reader / writer 10 as in the fourth embodiment, the conversion device 20 can be used with the original operation feeling of the reader / writer 10 without being aware of the use of the conversion device 20. Can do.
Embodiment 5 FIG.

Embodiment 5 FIG.
FIG. 21 is a block diagram showing Embodiment 5 of the radio frequency and communication procedure converting apparatus according to the present invention.

  In the fourth embodiment, the entire conversion device 20 is attached to the reader / writer 1. However, as shown in FIG. 21, only the reader / writer 10 side antenna 201 of the conversion device 20 in FIG. The conversion device 20 may be mounted and connected to the antenna 201 via the wire 40.

  By adopting such a configuration, for example, if the antenna 201 is coiled as in the case where the carrier frequency is 125 KHz or 13.56 MHz, the wireless signal emitted from the reader / writer 20 is wired via the antenna 201. 40, and the radio signal emitted from the reader / writer 10 can be communicated with the electronic tag 31 that can be directly supported by the reader / writer 10 via the antenna 201, for example.

  When communicating with the electronic tag 30, the conversion device 20 can communicate with the electronic tag 30, and when communicating with the electronic tag 31, the reader / writer 10 can communicate with the electronic tag 31.

  The conversion device for radio frequency and communication procedure according to the present invention is a low-frequency and environment for use as a conversion device for radio frequency and communication procedure that enables communication between a reader / writer and an electronic tag that is not originally supported by the reader / writer. It is possible to effectively use it for the construction of a flexible information system that can select and use the most suitable electronic tag.

It is a block diagram which shows Embodiment 1 of the conversion apparatus of the radio | wireless frequency and communication procedure which concerns on this invention. It is a block diagram which shows the converter in FIG. 3 is a flowchart illustrating an operation of the conversion device according to the first embodiment. 3 is a flowchart illustrating an operation of the conversion device according to the first embodiment. 3 is a flowchart illustrating an operation of the conversion device according to the first embodiment. It is a block diagram which shows Embodiment 2 of the conversion apparatus of the radio frequency and communication procedure which concerns on this invention. 10 is a flowchart showing the operation of the conversion device in the second embodiment. 10 is a flowchart showing the operation of the conversion device in the second embodiment. 10 is a flowchart showing the operation of the conversion device in the second embodiment. 10 is a flowchart showing the operation of the conversion device in the second embodiment. 10 is a flowchart showing the operation of the conversion device in the second embodiment. It is a block diagram which shows Embodiment 3 of the conversion apparatus of the radio frequency and communication procedure which concerns on this invention. 10 is a flowchart showing the operation of the conversion apparatus in the third embodiment. 10 is a flowchart showing the operation of the conversion apparatus in the third embodiment. 10 is a flowchart showing the operation of the conversion apparatus in the third embodiment. 10 is a flowchart showing the operation of the conversion apparatus in the third embodiment. 10 is a flowchart showing the operation of the conversion apparatus in the third embodiment. 10 is a flowchart showing the operation of the conversion apparatus in the third embodiment. 10 is a flowchart showing the operation of the conversion apparatus in the third embodiment. It is a block diagram which shows Embodiment 4 of the conversion apparatus of the radio frequency and communication procedure which concerns on this invention. It is a block diagram which shows Embodiment 5 of the conversion apparatus of the radio frequency and communication procedure which concerns on this invention.

Explanation of symbols

10 reader / writer, 20 conversion device, 30, 31 electronic tag, 40 wired,
201, 205 antenna, 202, 204 modulation / demodulation unit, 203 conversion unit,
211 data storage unit, 221 state control unit, 222 anti-collision control unit,
223 ID storage unit, A11, A31, A41, A42, A51 tag ID,
A12 length-adjusted tag ID, A21 tag read data,
A23 Tag write data.

Claims (5)

A first antenna for performing wireless communication with a reader / writer having an antenna;
A second antenna for wireless communication with the electronic tag;
A first modem unit having a function of modulating and demodulating a carrier wave for wireless communication with the reader / writer;
A second modem unit having a function of modulating and demodulating a carrier wave for wireless communication with the electronic tag;
An instruction issued by the reader / writer is received as digital data demodulated by the first modem, and the received instruction is converted into a format suitable for the electronic tag, and a communication procedure is generated to convert the converted instruction A carrier wave for performing wireless communication with the reader / writer modulated by the second modem unit is transmitted to the electronic tag, and response data from the electronic tag is received as digital data demodulated by the second modem unit. Then, the received response data is converted into a format and communication procedure suitable for the reader / writer, and is transmitted to the reader / writer using a carrier wave for wireless communication with the reader / writer modulated by the first modem unit. A conversion unit;
An apparatus for converting between radio frequency and communication procedure, comprising: 2. A data storage unit for storing the read data responded by the read command of the reader / writer and the write data transmitted by the write command of the reader / writer via the conversion unit. Radio frequency and communication procedure conversion device. A collision prevention control unit for executing a collision protocol;
When the collision prevention protocol is executed, the collision prevention control unit executes control, and after the electronic tag to be accessed is selected and data reading / writing occurs, the conversion unit performs control. A state control unit to
An ID storage unit for storing the tag ID of the electronic tag detected by executing the collision protocol;
The radio frequency and communication procedure conversion device according to claim 2, comprising: The radio frequency and communication procedure conversion device according to claim 1, wherein the conversion device is integrated with the reader / writer. The first antenna for performing wireless communication with the reader / writer is attached to the antenna of the reader / writer, and the antenna of the reader / writer and the converter unit are communicated with each other by wire. The radio frequency and communication procedure conversion device according to 1.

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