CN101706878A

CN101706878A - Passive RFID system

Info

Publication number: CN101706878A
Application number: CN200810118906A
Authority: CN
Inventors: 王莹
Original assignee: Individual
Current assignee: Individual
Priority date: 2008-08-26
Filing date: 2008-08-26
Publication date: 2010-05-12

Abstract

The invention relates to a passive RFID system, which relates to the field of radio frequency identification, in particular to the passive RFID system. The invention provides the passive RFID system which has high safety and no mechanical abrasion and can simultaneously identify a plurality of electronic tags. The passive RFID system comprises a passive RFID tag, an antenna and an RFID card reader, wherein the passive RFID tag consists of a coupling element and a circuit, and the energy required by the radio emission and the running of an internal process of the passive RFID tag comes from electromagnetic waves generated by a reader; the antenna is used for transmitting radio-frequency signals between the tag and the reader, namely transmitting data information of the tag; the RFID reader is a device for reading (or writing) electronic tag information; and the reader is connected with a computer through a network port, and transmits the read tag information to the computer so as to perform the next step processing.

Description

A kind of passive RFID system

Technical field:

The present invention relates to field of radio frequency identification, especially relates to a kind of passive RFID system.

Background technology:

Present widely used automatic identification technology such as bar code, magnetic card, IC-card have security low, mechanical wear is arranged, can not discern the shortcoming of a plurality of electronic tags simultaneously.

Summary of the invention:

The present invention is exactly at the problems referred to above, and a kind of safe, mechanical passive RFID system that weares and teares, can discern a plurality of electronic tags simultaneously of nothing is provided.

For achieving the above object, the present invention adopts following technical scheme, the present invention includes passive RFID tags, antenna, RFID card reader; Described passive RFID tags is made up of coupling element and circuit, the electromagnetic wave that its emission electric wave and internal processor operation institute energy requirement all produce from reader; Described antenna transmits radiofrequency signal between label and reader, i.e. the data message of label; Described RFID reader is the equipment that reads (or writing) electronic labeling information; Reader links to each other with computing machine by network interface. and the label information that reads is sent on the computing machine, is for further processing.

As preferred version one, the MF RC500 inside of hardware components of the present invention comprises parallel microcontroller interface, two-way.Fifo buffer, interruption, data processing unit, status unit, safety and cryptographic control unit, mimic channel interface and antennal interface; The external interface of MF RC500 comprises data bus, address bus, control bus (comprising read-write and interruption etc.) and power supply etc.; The parallel microcontroller interface of MF RC500 detects the type of 8 bit parallel interfaces of connection automatically; It comprises an easy-to-use two-way fifo buffer and a configurable interruption output, provides very big dirigibility for connecting various MCU.

As preferred version two, hardware components of the present invention is for anti-locking system " deadlocks ", and use MAX813 realizes the hot restart of system power-on reset, button and voltage detecting etc. as house dog.

As preferred version three, single-chip microcomputer of the present invention and PC serial ports level do not match, and use MAX232 type level translator to carry out level conversion.

As preferred version one, hardware components single-chip microcomputer of the present invention adopts AT89S51, because the exploitation of AT89S51 is simple, quick. and stable.

Beneficial effect of the present invention:

Because each electronic tag of the present invention has only identifier (ID), can't revise, can't copy, and has guaranteed security.

Compare outstanding advantage of the present invention with present widely used automatic identification technology such as bar code, magnetic card, IC-card etc.: the first, safe. be suitable for the terminal of high security.Secure data area is except that the cryptoguard of electronic tag, and data division can be realized safety management with some algorithms.There is the process of authentication mutually between read write line and the label. can realize secure communication and storage, read write line has directly not open to final user physical interface, and can guarantee the security of himself: the 2nd, can discern a plurality of electronic tags simultaneously; The 3rd, there are not the machinery wearing and tearing. the life-span is long. and can work in rugged environments such as various oil stains, contamination by dust; The 4th, Touchless manipulation need not manual intervention, uses facility when finishing identification work.

Description of drawings:

Fig. 1 structural representation of the present invention;

Fig. 2 is a hardware configuration schematic diagram of the present invention;

Fig. 3 is that system workflow of the present invention is published picture.

Embodiment:

Hardware components of the present invention mainly is made up of AT89S51, MF RC500, clock circuit, house dog, MAX232 and matrix keyboard etc. among Fig. 2.The working method of system be earlier by.MCU control MF RC500 driven antenna is just carried out read-write operation to transponder (PICC) to the Mifare card, communicates by letter with PC then, and data are passed to host computer; Governor circuit adopts AT89S51, because the exploitation of AT89S51 is simple, quick, stable; Adopt the AT24C256 type of ATMEL, the data of 12C bus EEPROM storage system; For anti-locking system " deadlock ", use MAX813 to realize the hot restart of system power-on reset, button and voltage detecting etc. as house dog, adopt the RS-232 mode with communicating by letter of host computer, total system is become the power supply of 5V again by the power supply of 9V power supply by Voltage stabilizing module 7805 voltage stabilizings.Wherein the AD0-AD7 of MFRC500 (pin 13 1 pin 20) is the bi-directional data and the address multiplex bus of band application schmitt trigger, meets the AD0-AD7 (pin 39 1 pin 32) of single-chip microcomputer AT89C51.The NWPdRNW of MFRC500 (pin 10) forbids/read signal for writing of band application schmitt trigger, meets the write signal WR (pin 16) of single-chip microcomputer.The NRD/NDS of MF RC500 (pin 11) for the band application schmitt trigger read forbid that the data strobe inhibit signal meets the read signal RD (pin 17) of single-chip microcomputer.The NCS of MF RC500 (pin 19) selects inhibit signal for the sheet of band application schmitt trigger. meet the I/O mouth line P2.7 (pin 28) of single-chip microcomputer.The ALE of MFRC500 (pin 21) is the address latch enable signal of band application schmitt trigger, connects the address latch signal (pin 30) of single-chip microcomputer.The IRQ of MF RC500 (pin 2) is the interrupt request singal of band application schmitt trigger, connects the interruption 0 (pin 12) of single-chip microcomputer.

The system works flow process

Except resetting, control is to realize that by the register of read-write MF RC500 MFRC500 has 64 registers, is divided into 8 register pages or leaves, 8 every page to the overwhelming majority of MF RC500; Each register all is 8, and single-chip microcomputer is operated these registers as the outer RAM of sheet; The code that this operation is corresponding writes corresponding address and gets final product, when the RF1D of correspondence card S50 enters the effective range of reader, the energy of antenna make rfid card be coupled out self work energy, and set up and communicate by letter, MF RC500 mainly is to FIFODATA by the order of reporting, parameter and data to the operation of card, arrive 120MMAND by write order again, realize communication (see figure 3) with rfid card.

Claims

1. a passive RFID system comprises passive RFID tags, antenna, RFID card reader; It is characterized in that described passive RFID tags is made up of coupling element and circuit, the electromagnetic wave that its emission electric wave and internal processor operation institute energy requirement all produce from reader; Described antenna transmits radiofrequency signal between label and reader, i.e. the data message of label; Described RFID reader is the equipment that reads (or writing) electronic labeling information; Reader links to each other with computing machine by network interface. and the label information that reads is sent on the computing machine, is for further processing.

2. a kind of passive RFID system according to claim 1 is characterized in that MF RC500 inside comprises parallel microcontroller interface, two-way in the RFID card reader; Fifo buffer, interruption, data processing unit, status unit, safety and cryptographic control unit, mimic channel interface and antennal interface; The external interface of MF RC500 comprises data bus, address bus, control bus (comprising read-write and interruption etc.) and power supply etc.; The parallel microcontroller interface of MF RC500 detects the type of 8 bit parallel interfaces of connection automatically; It comprises an easy-to-use two-way fifo buffer and a configurable interruption output, provides very big dirigibility for connecting various MCU.

3. a kind of passive RFID system according to claim 1 is characterized in that using in the RFID card reader MAX813 to realize the hot restart and the voltage detecting of system power-on reset, button as house dog.

4. a kind of passive RFID system according to claim 1 is characterized in that single-chip microcomputer adopts AT89S51 in the RFID card reader.

5. a kind of passive RFID system according to claim 1 is characterized in that adopting in the RFID card reader MAX232 type level translator to carry out level conversion.