CN202025340U

CN202025340U - Low-frequency RFID read-write device of USB1.1 interface

Info

Publication number: CN202025340U
Application number: CN2011200375199U
Authority: CN
Inventors: 丁瑾; 朱全银
Original assignee: Huaiyin Institute of Technology
Current assignee: Huaiyin Institute of Technology
Priority date: 2011-02-14
Filing date: 2011-02-14
Publication date: 2011-11-02
Anticipated expiration: 2021-02-14

Abstract

The utility model discloses a low-frequency RFID (radio frequency identification) read-write device of a USB1.1 interface. The read-write device utilizes a sending antenna to send radio frequency signals in a specific frequency of 125kHz, and induced current is generated when a target attached with an e-tag enters into the working area of the sending antenna; a receiving antenna of the read-write device receives modulating signals sent by the tag, then the modulating signals are transmitted to a signal acquisition module of the read-write device through an antenna regulator, and effective information obtained through demodulating and decoding the modulating signals is sent to a data processing module for related processing; and the data processing module identifies the identity of the tag according to logical operation, so as to conduct corresponding processing and control, and at last gives out instruction signals to control the read-write device to complete different read-write operations and stores the identity data of the tag into a memory chip or outputs the identity data through a USB1.1 output interface or a Wigan protocol interface. The read-write device has the advantages of small volume, low cost, low power consumption, high read-write speed, strong anti-interference ability, and good confidentiality, and can realize non-contact read-write, storage, and output of a plurality of passive tags and radio-frequency tags.

Description

A kind of USB1.1 interface low frequency RF ID read-write equipment

Technical field

The utility model relates to read write line, is specifically related to a kind of USB1.1 interface low frequency RF ID read-write equipment.

Background technology

The RFID technology is to begin a kind of automatic identification technology of rising and moving to maturity gradually the nineties in 20th century.It utilizes radiofrequency signal to realize the non-contact information transmission by the space coupling, and the information of passing through to be transmitted reaches the purpose of identification.Basic rfid system is made up of electronic tag, read write line, antenna and background host computer system.RFID has been thought to realize a kind of major technique of general calculation entironment by most of people, it is application scenarios widely, and cheap cost is disposed the simplicity of implementing, and has attracted user, researchist and IT vendor more and more.

Summary of the invention

The purpose of this utility model is: a kind of USB1.1 interface low frequency RF ID read-write equipment is provided, read the passive label radiofrequency signal that receives from external antenna, export to single-chip microcomputer after treatment, the signal that single-chip microcomputer receives gets the identity information of outgoing label after treatment, export to the computing machine that has USB HOST interfacing equipment or have USB interface by the USB1.1 interface, use as various computer data acquiring or management information system based on electronic tag.

Technical solution of the present utility model is: the radiofrequency signal that is sent the 125KHz characteristic frequency by read-write equipment by emitting antenna, when entering the emitting antenna perform region, the destination object that adheres to electronic tag produces induction current, be activated thereby obtain energy, make electronic tag that self coded message is sent by built-in radio-frequency antenna; The receiving antenna of read-write equipment receives the modulation signal that sends from label, is sent to the read-write equipment signal acquisition module through the antenna adjustments device, behind the demodulation sign indicating number effective information is delivered to data processing module and carries out relevant treatment; Data processing module is discerned the identity of this label according to logical operation, make corresponding processing and control at different settings, finally send command signal control read-write equipment and finish different read-write operations, and the Identity data store of label is exported in storer or by USB1.1 output interface, Wei root protocol interface.

Read-write equipment of the present utility model comprises U1 part, U2 part and U3 part, and U1 part, U2 part and U3 partly are interconnected to constitute the circuit of read-write equipment; The U1 part is finished the processing of input signal and the output of control signal based on AT89S52; The U2 part is finished the read-write and the processing of radiofrequency signal generation, transmission and electronic tag signal based on U2270B; The U3 part is finished the USB1.1 interface output of electronic tag data based on PDUSBD12; Wherein, physical circuit connects as follows:

U1 part (AT89S52):

The 1st pin of AT89S52 is connected to the 2nd pin of U2270B and the end of R3, another termination power of R3; The 2nd pin to the 5 pins of AT89S52 are unsettled; The 6th pin of AT89S52 is connected to the 4th pin of J3; The 7th pin of AT89S52 is connected to the 5th pin of J3; The 8th pin of AT89S52 is connected to the 6th pin of J3; The 9th pin of AT89S52 is connected to the 20th pin of PDUSBD12 and the 3rd pin of J3; The 10th pin of AT89S52 is unsettled; The 11st pin of AT89S52 is unsettled; The 14th pin of the 12nd pin PDUSBD12 of AT89S52 and the end of R11, another termination power of R11; The 13rd pin of AT89S52 is connected to the 6th pin of U2270B and the end of R4, another termination power of R4; The 14th pin and the 15th pin of AT89S52 are unsettled; The 16th pin of AT89S52 is connected to the 16th pin of PDUSBD12; The 17th pin of AT89S52 is connected to the 15th pin of PDUSBD12; The 18th pin of AT89S52 is connected to C5 and Y2, C5 other end ground connection, the 19th pin of Y2 another termination C6 and AT89S52; The 19th pin of AT89S52 is connected to C6 and Y2, C6 other end ground connection, the 18th pin of Y2 another termination C5 and AT89S52; The 21st pin of AT89S52 is connected to the 1st pin of J1; The 22nd pin of AT89S52 is connected to the 2nd pin of J1; The 23rd pin of AT89S52 is connected to the 3rd pin of J1; The 24th pin of AT89S52 is connected to the 4th pin of J1; The 25th pin of AT89S52 is connected to the 5th pin of J1; The 26th pin of AT89S52 is connected to the 6th pin of J1; The 27th pin of AT89S52 is connected to the 7th pin of J1; The 28th pin of AT89S52 is connected to the 11st pin of PDUSBD12; The 29th pin of AT89S52 is unsettled; The 30th pin of AT89S52 is connected to the 10th pin of PDUSBD12; The 31st pin of AT89S52 connects power supply; The 32nd pin of AT89S52 is connected to the 9th pin of PDUSBD12; The 33rd pin of AT89S52 is connected to the 8th pin of PDUSBD12; The 34th pin of AT89S52 is connected to the 7th pin of PDUSBD12; The 35th pin of AT89S52 is connected to the 6th pin of PDUSBD12; The 36th pin of AT89S52 is connected to the 4th pin of PDUSBD12; The 37th pin of AT89S52 is connected to the 3rd pin of PDUSBD12; The 38th pin of AT89S52 is connected to the 2nd pin of PDUSBD12; The 39th pin of AT89S52 is connected to the 1st pin of PDUSBD12;

U2 part (U2270B):

The 1st pin ground connection of U2207B; The 2nd pin of U2207B is connected to the 1st pin of R3 and AT89S52, another termination power of R3; The 3rd pin ground connection of U2207B; The 4th pin of U2207B is connected to CIN, another termination of CIN C4, R5, R10, C4 other end ground connection, R5 other end ground connection, another termination of R10 D5 negative pole, the D5 positive pole connects the 1st pin of R7, R8, C2 and J2, another termination of R7 D2, D4 positive pole, another termination of R8 D1, D3 negative pole, the 8th pin of another termination of C2 D1 positive pole and U2207B, the D2 negative pole connects the 9th pin of C3, R6 and U2207B, the D3 positive pole connects D4 negative pole and R1, R2, C1, the 15th pin of another termination of R1 U2207B, C1 other end ground connection, another termination power of R2, the 2nd pin of another termination of C3 and R6 J2; The 5th pin of U2207B connects power supply; The 6th pin of U2207B is connected to the 13rd pin of R4 and AT89S52, another termination power of R4; The 7th pin ground connection of U2207B; The 8th pin of U2207B meets D1 positive pole and C2; The 9th pin of U2207B meets D2 negative pole and C3, R6; The 10th pin of U2207B connects power supply; The 11st pin of U2207B connects power supply; The 12nd pin of U2207B connects power supply; The 13rd pin ground connection of U2207B; The 14th pin of U2207B connects power supply; The 15th pin of U2207B is connected to R1, another termination C1, R2, D3 positive pole and the D4 negative pole of R1; The 16th pin of U2207B is connected to CHP, the other end ground connection of CHP;

U3 part (PDUSBD12):

The 1st pin of PDUSBD12 is connected to the 39th pin of AT89S52; The 2nd pin of PDUSBD12 is connected to the 38th pin of AT89S52; The 3rd pin of PDUSBD12 is connected to the 37th pin of AT89S52; The 4th pin of PDUSBD12 is connected to the 36th pin of AT89S52; The 5th pin ground connection of PDUSBD12; The 6th pin of PDUSBD12 is connected to the 35th pin of AT89S52; The 7th pin of PDUSBD12 is connected to the 34th pin of AT89S52; The 8th pin of PDUSBD12 is connected to the 33rd pin of AT89S52; The 9th pin of PDUSBD12 is connected to the 32nd pin of AT89S52; The 10th pin of PDUSBD12 is connected to the 30th pin of AT89S52; The 11st pin of PDUSBD12 is connected to the 28th pin of AT89S52; The 12nd pin of PDUSBD12 is connected to the end of R20, another termination power of R20; The 14th pin of PDUSBD12 is connected to the 12nd pin of AT89S52 and the end of R21, another termination power of R21; The 15th pin of PDUSBD12 is connected to the 17th pin of AT89S52; The 16th pin of PDUSBD12 is connected to the 16th pin of AT89S52; The 18th pin of PDUSBD12 is connected to the end of R19, another termination power of R19; The 19th pin of PDUSBD12 is connected to the end of R17 and R18, another termination power of R17, the other end ground connection of R18; The 20th pin of PDUSBD12 is connected to the 9th pin of AT89S52; The 21st pin of PDUSBD12 connects the negative pole of LED2, and the positive pole of LED2 connects the end of R16, another termination power of R16; The 22nd pin of PDUSBD12 connects the end of Y3 and C13, the other end ground connection of C13, the end of another termination C12 of Y3 and the 23rd pin of PDUSBD12, the other end ground connection of C12; The 24th pin of PDUSBD12 connects power supply; The 25th pin of PDUSBD12 connects the end of R12, the end of another termination R15 of R12 and the 2nd pin of J4, the other end ground connection of R15; The 26th pin of PDUSBD12 connects the end of R13, the end of another termination R14 of R13 and the 3rd pin of J4, the other end ground connection of R14; The 27th pin of PDUSBD12 connects the positive pole of CD2 and the end of C11, the other end ground of the negative pole of CD2 and C11; The 28th pin of PDUSBD12 connects the end of R11, the other end ground connection of R11.

Wherein, connect input interface and output interface on the circuit of the present utility model and finish signals collecting and data output, input interface is a rf input interface, and output interface comprises USB1.1 output interface, Wei root agreement output interface.

The utlity model has following advantage: 1, the acp chip of the passive label radiofrequency signal data acquisition module in the read-write equipment is the U2270B chip, is 32 pin integrated chips, and function is strong, and is low in energy consumption, is operated in the 125KHz low-frequency range; The acp chip of data processing module is the AT89S52 chip, and it has 32 programmable Is/O mouth, and compatible fully with the MCS-51 instruction, and inner attaching has the RAM of 256B available, and the erasable FLASH of 8KB etc. is arranged; In this device, be stored in the AT89S52 chip, also can pass through USB1.1 output interface, the output of Wei root protocol interface through the electronic tag data after the AT89S52 processing; The USB1.1 transport module uses the PDUSBD12 device, and the conversion that this USB1.1 transmission equipment can be finished also-go here and there makes the signal of handling be transferred in the computing machine by USB interface and handles; The chip price of this read-write equipment circuit is cheap, and chip pin is few, and circuit is simple.

2, the volume of this read-write equipment is little, and cost is low, and is low in energy consumption, and read or write speed is fast, realize contactless read-write and the storage and the output of a plurality of passive label radio-frequency (RF) tag, and antijamming capability is strong, and security performance is good.

Description of drawings

Fig. 1 is circuit theory diagrams of the present utility model

Embodiment

Further specify technical solution of the present utility model below in conjunction with accompanying drawing.

As shown in Figure 1, read-write equipment comprises U1 part, U2 part and U3 part, and U1 part, U2 part and U3 partly are interconnected to constitute the circuit of read-write equipment, and wherein, physical circuit connects as follows:

U1 part (AT89S52):

U2 part (U2270B):

U3 part (PDUSBD12):

The explanation of product running environment:

The development system environment:

Windows?XP?Professiona1(Build?2600.xpsp_sp2_gdr.050301-1510(Service?Pack?2))

Exploitation programmed environment: Keil C51 programming language

Claims

1. USB1.1 interface low frequency RF ID read-write equipment, it is characterized in that: the radiofrequency signal that sends 125KHz by read-write equipment by the external emitting antenna of J2, when the destination object that adheres to electronic tag enters the emitting antenna perform region, read-write equipment receives the modulation signal that sends from label by the J2 external antenna, be sent to read write line U2270B signal acquisition module through the antenna adjustments device, through receiving circuit information delivered to single chip computer AT 89S52 and carry out data processing; Corresponding processing is made in different settings at scm software, and the identity data of label is exported by the USB1.1 output interface J4 of PDUSBD12 formation or by Wei root protocol interface J3.

2. a kind of USB1.1 interface low frequency RF ID read-write equipment according to claim 1 is characterized in that: read write line comprises U1 part, U2 part and U3 part, and U1 part, U2 part and U3 partly are interconnected to constitute the circuit of read-write equipment; The U1 part is finished the processing of input signal and the output of control signal based on AT89S52; The U2 part is finished the read-write and the processing of radiofrequency signal generation, transmission and electronic tag signal based on U2270B; The U3 part is finished the USB1.1 interface output of electronic tag data based on PDUSBD12; Wherein, physical circuit connects as follows:

U1 part (AT89S52):

U2 part (U2270B):

U3 part (PDUSBD12):

3. a kind of USB1.1 interface low frequency RF ID read-write equipment according to claim 2, it is characterized in that: connect input interface and output interface on the circuit of read-write equipment and finish signals collecting and data output, input interface is a rf input interface, and output interface comprises USB1.1 output interface, Wei root agreement output interface.