CN201749482U

CN201749482U - High-frequency RS485 RFID read-write device

Info

Publication number: CN201749482U
Application number: CN2010201866668U
Authority: CN
Inventors: 曹苏群; 朱全银
Original assignee: Huaiyin Institute of Technology
Current assignee: Huaiyin Institute of Technology
Priority date: 2010-05-06
Filing date: 2010-05-06
Publication date: 2011-02-16
Anticipated expiration: 2020-05-06

Abstract

The utility model discloses a high-frequency RS485 RFID read-write device which is characterized in that the read-write device transmits special radio frequency signals of 13.56 MKHz through a transmitting antenna; induction currents are generated when an target object with an electronic label enters into the working area of the transmitting antenna; the coded information of the electronic tag is transmitted through an internal transmitting antenna; the receiving antenna of the read-write device receives the modulation signal transmitted from the electronic tag; the modulation signal is transmitted to the signal acquisition module of the read-write device through an antenna tuner; effective information obtained after demodulation and decoding is transmitted to a data processing module for being correlatively processed; the data processing module identifies the information of the electronic tag according to the logic operation, so as to carry out the corresponding process and control; a command signal is transmitted for controlling the read-write device to finish different read-write operations, and finally the identification data of the electronic tag is stored in a memory module. The read-write device has the advantages of small size, low cost, low power consumption, quick speed in reading and writing, realization of noncontact read-write, storage and output of a plurality of passive tags and radio frequency tags, high anti-interference capability and good secrecy performance.

Description

A kind of RS485 high frequency rfid interrogator

Technical field

The utility model relates to read write line, is specifically related to a kind of RS485 high frequency rfid interrogator.

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 RS485 high frequency rfid interrogator is provided, the passive label radiofrequency signal that read-write 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 remote computer that meets interface standard by serial line 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 13.56MKHz characteristic frequency by read write line 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 line receives the modulation signal that sends from label, is sent to the read write line 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, makes corresponding processing and control at different settings, finally send command signal control read write line and finish different read-write operations, and with the Identity data store of label in memory module.

Read write line 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 line; 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 RC500; The U3 part is finished the access of electronic tag data based on AT24C02; Wherein, physical circuit connects as follows:

U1 part (AT89S52):

The 1st pin of AT89S52 is connected to the 31st pin of RC500; The 2nd pin of AT89S52 is connected to the 6th pin of R14 and AT24C02, another termination power of R14; The 3rd pin of AT89S52 is connected to the 5th pin of R13 and AT24C02, another termination power of R13; The 4th pin of AT89S52 is unsettled; The 5th pin of AT89S52 is unsettled; The 6th pin of AT89S52 is connected to the 4th pin of ISP; The 7th pin of AT89S52 is connected to the 5th pin of ISP; The 8th pin of AT89S52 is connected to the 6th pin of ISP; The 9th pin of AT89S52 connects R16, CD1 negative pole, R16 other end ground connection, and the CD1 positive pole connects power supply; The 10th pin of AT89S52 is connected to the 1st pin of J2; The 11st pin of AT89S52 is connected to the 2nd pin of J2; The 12nd pin of AT89S52 is connected to the 2nd pin of RC500; The 13rd pin of AT89S52 is unsettled; The 14th pin of AT89S52 is connected to R12, the negative pole of another termination of R12 LED2, and the positive pole of LED2 connects power supply; The 15th pin of AT89S52 is unsettled; The 16th pin of AT89S52 is connected to the 10th pin of RC500; The 17th pin of AT89S52 is connected to the 11st pin of RC500; The 18th pin of AT89S52 is connected to C18 and Y2, C18 other end ground connection, the 19th pin of Y2 another termination C18 and AT89S52; The 19th pin of AT89S52 is connected to C19 and Y2, C19 other end ground connection, the 18th pin of Y2 another termination C18 and AT89S52; The 20th pin ground connection (not drawing among the figure) of AT89S52; The 21st pin of AT89S52 is connected to the 1st pin of J3; The 22nd pin of AT89S52 is connected to the 2nd pin of J3; The 23rd pin of AT89S52 is connected to the 3rd pin of J3; The 24th pin of AT89S52 is connected to the 4th pin of J3; The 25th pin of AT89S52 is connected to the 5th pin of J3; The 26th pin of AT89S52 is connected to the 6th pin of J3; The 27th pin of AT89S52 is connected to the 7th pin of J3; The 28th pin of AT89S52 is connected to the 9th pin of RC500; The 29th pin of AT89S52 is unsettled; The 30th pin of AT89S52 is connected to the 21st pin of RC500; The 31st pin of AT89S52 connects power supply; The 32nd pin of AT89S52 is connected to the 20th pin of RC500; The 33rd pin of AT89S52 is connected to the 19th pin of RC500; The 34th pin of AT89S52 is connected to the 18th pin of RC500; The 35th pin of AT89S52 is connected to the 17th pin of RC500; The 36th pin of AT89S52 is connected to the 16th pin of RC500; The 37th pin of AT89S52 is connected to the 15th pin of RC500; The 38th pin of AT89S52 is connected to the 14th pin of RC500; The 39th pin of AT89S52 is connected to the 13rd pin of RC500; The 40th pin of AT89S52 is connected to VCC;

U2 part (RC500):

The 1st pin of RC500 meets C7 and Y1, C7 other end ground connection, the 32nd pin of Y1 another termination C8 and RC500; The 2nd pin of RC500 is connected to the 12nd pin of AT89S52; The 3rd pin of RC500 is unsettled; The 4th pin of RC500 is unsettled; The 5th pin of RC500 meets L3, the 1st pin of L3 another termination C11 and J4, the 8th pin of another termination of C11 RC500; The 6th pin of RC500 meets L2 and C4, C4 other end ground connection, another termination power of L2; The 7th pin of RC500 meets L4, the 3rd pin of L4 another termination C13 and J4, the 8th pin of another termination of C13 RC500; The 8th pin of RC500 connects the 2nd pin of C11, C13 and J4; The 9th pin of RC500 is connected to the 28th pin of AT89S52; The 10th pin of RC500 is connected to the 16th pin of AT89S52; The 11st pin of RC500 is connected to the 17th pin of AT89S52; The 12nd pin ground connection of RC500; The 13rd pin of RC500 is connected to the 39th pin of AT89S52; The 14th pin of RC500 is connected to the 38th pin of AT89S52; The 15th pin of RC500 is connected to the 37th pin of AT89S52; The 16th pin of RC500 is connected to the 36th pin of AT89S52; The 17th pin of RC500 is connected to the 35th pin of AT89S52; The 18th pin of RC500 is connected to the 34th pin of AT89S52; The 19th pin of RC500 is connected to the 33rd pin of AT89S52; The 21st pin that the 20th pin of RC500 is connected to the 32nd pin RC500 of AT89S52 is connected to the 30th pin of AT89S52; The 22nd pin of RC500 connects power supply; The 23rd pin of RC500 connects power supply; The 24th pin ground connection of RC500; The 25th pin of RC500 connects power supply; The 26th pin of RC500 is connected to C1, L1, C1 other end ground connection, another termination power of L1; The 27th pin of RC500 is unsettled; The 28th pin of RC500 meets C10, the 30th pin of C10 another termination R6 and RC500, the 29th pin of R6 another termination R7 and RC500, another termination of R7 C6, the 4th pin of another termination of C10 J4; The 29th pin of RC500 is connected to R6 and R7; The 30th pin of RC500 is connected to R6 and C10; The 31st pin of RC500 is connected to the 1st pin of AT89S52; The 32nd pin of RC500 is connected to and meets C8 and Y1, C8 other end ground connection, the 1st pin of Y1 another termination C7 and RC500;

U3 part (AT24C02):

The 1st pin ground connection of AT24C02; The 2nd pin ground connection of AT24C02; The 3rd pin ground connection of AT24C02; The 4th pin ground connection of AT24C02; The 5th pin of AT24C02 is connected to the 3rd pin of R13 and AT89S52, another termination power of R13; The 6th pin of AT24C02 is connected to the 2nd pin of R14 and AT89S52, another termination power of R14; The 7th pin ground connection of AT24C02; The 8th pin of AT24C02 connects power supply.

Connect input interface and output interface on the circuit of read write line of the present utility model and finish signals collecting and data output, input interface is rf input interface or other CPU interrupt control input interface, and output interface is serial output interface, PC keyboard output interface or the Wei root agreement output interface of Transistor-Transistor Logic level.

The utlity model has following advantage: 1, the acp chip of the passive label radiofrequency signal data acquisition module of this read write line is the RC500 chip, is 32 pin integrated chips, and function is strong, and is low in energy consumption, is operated in the 13.56MKHz high band; The acp chip of data processing module is the AT89S52 chip, it has 32 programmable Is/O mouth, and compatible fully with the MCS-51 instruction, and inner attaching has the RAM of 256B available, the erasable FLASH of 8KB is arranged, and serial communication port of a full duplex etc. is arranged; In this device, be stored among the eeprom chip AT24C02 through the electronic tag data after the AT89S52 processing, or export by the serial line interface of Transistor-Transistor Logic level, the chip price of the circuit of this read write line is cheap, and chip pin is few, and circuit is simple.

2, this read write line volume 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 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 line; 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 RC500; The U3 part is finished the access of electronic tag data based on AT24C02; Wherein, physical circuit connects as follows:

U1 part (AT89S52):

U2 part (RC500):

The 1st pin of RC500 meets C7 and Y1, C7 other end ground connection, the 32nd pin of Y1 another termination C8 and RC500; The 2nd pin of RC500 is connected to the 12nd pin of AT89S52; The 3rd pin of RC500 is unsettled; The 4th pin of RC500 is unsettled; The 5th pin of RC500 meets L3, the 1st pin of L3 another termination C11 and J4, the 8th pin of another termination of C11 RC500; The 6th pin of RC500 meets L2 and C4, C4 other end ground connection, another termination power of L2; The 7th pin of RC500 meets L4, the 3rd pin of L4 another termination C13 and J4, the 8th pin of another termination of C13 RC500; The 8th pin of RC500 connects the 2nd pin of C11, C13 and J4; The 9th pin of RC500 is connected to the 28th pin of AT89S52; The 10th pin of RC500 is connected to the 16th pin of AT89S52; The 11st pin of RC500 is connected to the 17th pin of AT89S52; The 12nd pin ground connection of RC500; The 13rd pin of RC500 is connected to the 39th pin of AT89S52; The 14th pin of RC500 is connected to the 38th pin of AT89S52; The 15th pin of RC500 is connected to the 37th pin of AT89S52; The 16th pin of RC500 is connected to the 36th pin of AT89S52; The 17th pin of RC500 is connected to the 35th pin of AT89S52; The 18th pin of RC500 is connected to the 34th pin of AT89S52; The 19th pin of RC500 is connected to the 33rd pin of AT89S52; The 20th pin of RC500 is connected to the 32nd pin of AT89S52; The 21st pin of RC500 is connected to the 30th pin of AT89S52; The 22nd pin of RC500 connects power supply; The 23rd pin of RC500 connects power supply; The 24th pin ground connection of RC500; The 25th pin of RC500 connects power supply; The 26th pin of RC500 is connected to C1, L1, C1 other end ground connection, another termination power of L1; The 27th pin of RC500 is unsettled; The 28th pin of RC500 meets C10, the 30th pin of C10 another termination R6 and RC500, the 29th pin of R6 another termination R7 and RC500, another termination of R7 C6, the 4th pin of another termination of C10 J4; The 29th pin of RC500 is connected to R6 and R7; The 30th pin of RC500 is connected to R6 and C10; The 31st pin of RC500 is connected to the 1st pin of AT89S52; The 32nd pin of RC500 is connected to and meets C8 and Y1, C8 other end ground connection, the 1st pin of Y1 another termination C7 and RC500;

U3 part (AT24C02):

The explanation of product running environment:

The development system environment:

Windows?XP?Professional(Build2600.xpsp_sp2_gdr.050301-1510(Service?Pack?2))

Test system environment:

Windows?2000?Server(Service?Pack?2)

Windows?XP

The exploitation programmed environment:

Visual?C++6.0

MCS-51

MCS-C51

The test program environment:

Visual Basic 6.0 and Delphi 7.0.

Claims

1. RS485 high frequency rfid interrogator 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 line; 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 RC500; The U3 part is finished the access of electronic tag data based on AT24C02; Wherein, physical circuit connects as follows:

The U1 part:

The U2 part:

The U3 part:

2. a kind of RS485 high frequency rfid interrogator according to claim 1, it is characterized in that: connect input interface and output interface on the circuit of read write line and finish signals collecting and data output, input interface is rf input interface or other CPU interrupt control input interface, and output interface is serial output interface, PC keyboard output interface or the Wei root agreement output interface of Transistor-Transistor Logic level.