CN202126695U

CN202126695U - Handheld radio frequency identification reader with group reading function

Info

Publication number: CN202126695U
Application number: CN2011201923260U
Authority: CN
Inventors: 马保国; 黄之杰; 胡勇; 辛后居
Original assignee: XUHOU AIR FORCE COLLEGE OF PLA
Current assignee: XUHOU AIR FORCE COLLEGE OF PLA
Priority date: 2011-06-09
Filing date: 2011-06-09
Publication date: 2012-01-25
Anticipated expiration: 2021-06-09

Abstract

The utility model discloses a handheld radio frequency identification reader with a group reading function and relates to the technical field of RFID (radio frequency identification). The radio frequency identification handheld reader consists of a read-write head and a handheld computer connected with the read-write head; the read-write head comprises a radio frequency transmitting and receiving chip, a radio frequency matching network circuit and a transmitting and receiving antenna, wherein the radio frequency matching network circuit is connected with the radio frequency transmitting and receiving chip, and the transmitting and receiving antenna is connected with the radio frequency matching network circuit. The handheld radio frequency identification reader has the advantages that the small-sized ultrahigh frequency transmitting and receiving chip with a microcomputer is combined with the handheld computer to realize the group reading function, and the radio frequency identification handheld reader saves electricity and has low cost.

Description

Has group RF identification handhold read-write device of reading function

Technical field

The utility model relates to the electronic label technology field, specifically is a kind of RF identification handhold read-write device that the crowd reads function that has, and belongs to a kind of RFID read-write equipment.

Background technology

RF identification (Radio Frequency Identification; RFID) technology is a kind of non-contact automatic identification technology that utilizes twireless radio-frequency communication to realize; Compare with the bar codes technique that extensively adopts at present, RFID has characteristics such as capacity is big, decipherment distance is far away, penetration capacity is strong, pollution resistance is strong.The RFID technology developed comparative maturity and obtained extensive commercialization; The comparatively ripe rfid system of development mainly is 125kHz and 13.56MHz system; But 125kHz and 13.56MHz system generally can only read label is single; And can the ultra-high frequency RFID technology that population of tags is read be relatively lagged behind among the 800/900MHz, especially the ultrahigh frequency RFID in the handheld device does not all have the crowd to read function, can only read single label.

Summary of the invention

Can not the problem read of crowd in order to solve the handhold read-write device, the utility model provides a kind of RF identification handhold read-write device that the crowd reads function that has, and this read write line crowd simultaneously read a plurality of labels.

The utility model is realized with following technical scheme: a kind of have the crowd and read the RF identification handhold read-write device of function; Comprise read/write head and the HPC that is connected with read/write head; Said read/write head comprises rf chip; The radio frequency matching network circuit that is connected with rf chip, the dual-mode antenna that is connected with the radio frequency matching network circuit.

The beneficial effect of the utility model is: adopts ultrahigh frequency transceiving chip small-sized and that have a microprocessor to combine, can realize that the crowd reads function with HPC, and power saving, cheap.

Description of drawings

Below in conjunction with accompanying drawing and embodiment the utility model is described further.

Fig. 1 is the utility model theory diagram;

Fig. 2 is the radio frequency matching network circuit diagram;

Fig. 3 is the anti-collision algorithms process flow diagram;

Fig. 4 is the Manchester coding process flow diagram of present embodiment;

Fig. 5 is the FM0 decoding process process flow diagram of present embodiment.

Embodiment

As shown in Figure 1, have group RF identification handhold read-write device of reading function and form with the HPC that is connected with read/write head by read/write head.Read/write head is connected with HPC (PDA), matching coding, decoding, and anti-collision algorithms software composition can group read write line of reading.Said read/write head comprises rf chip, the radio frequency matching network circuit that is connected with rf chip, the dual-mode antenna that is connected with the radio frequency matching network circuit.Said PDA has UART mouth, RS-232 mouth and the Ethernet interface of communicating by letter with host computer, and wherein Ethernet interface is the wireless ethernet mouth.Operation for ease becomes the hand-held gun type with the shaped design of handhold read-write device, and the place of anterior protrusion is used to be provided with dual-mode antenna.

In the present embodiment; Adopt rf chip nRF9E5 to be connected,, accomplish read-write label through dual-mode antenna by PDA configuration and control rf chip nRF9E5 with HPC (PDA); Wherein, Dual-mode antenna adopts annular differential antennae, and is furnished with the radio frequency matching network circuit, can reduce the volume of read head.Rf chip nRF9E5 has two I/O port P0 and the P1s identical with single-chip microcomputer 8051; These two ports are two-way IO mouths that CMOS drives; Its direction is controlled by DIR and ALT position, and rf chip nRF9E5 mainly passes through P0 and P1 mouth with communicating by letter of PDA, and ANT1 is that antenna is connected pin with ANT2; Adopt PCB annular differential antennae, can further reduce the volume of read/write head.

As shown in Figure 2, between chip nRF9E5 antenna connection pin and antenna, add a radio frequency matching network circuit and can improve emission efficiency.Described radio frequency matching network circuit comprises shunt capacitance C14 and inductance L 1 between the sky wire pin ANT1 that is connected in parallel on rf chip nRF9E5, ANT2; ANT1 and ANT2 pin are respectively through a capacity earth; The ANT1 pin be connected in series an inductance L 3 and capacitor C 3 back ground connection, the ANT2 pin is connected in series an inductance L 2, capacitor C 15, capacitor C 16 back ground connection; Receive an end of sending out antenna, the other end ground connection of dual-mode antenna between capacitor C 15 and the capacitor C 16.

As shown in Figure 3, anti-collision algorithms: to the requirement of read write line certain applications, accomplish anti-collision as shown in Figure 4 and read the card number flow process according to ISO/IEC18000-6B.At first read write line sends GROUP SELECT instruction, and the label that gets into the place is internal counter clear " 0 ", and returns UID.If the return data mistake is then sent the RESEND instruction, after continuous 2 RESEND instruction, return data is mistake still, thinks that then there are many cards in on-site, sends the FAIL instruction, carries out anti-collision.If return data is correct, then send DATA READ instruction, make this label leave the ID state, do not carrying out anti-collision procedure, send the SUCCESS instruction then, continue Card Reader.If continuous 5 times do not have echo corresponding, think that then the place do not have card, finish the anti-collision Card Reader.

The software design of present embodiment read write line: comprising serial communication modular, command process module, Echo Processing module and data coding/decoding module.

Read/write head is under the PDA monitoring, to carry out work, forms the master-slave communication pattern between the two.Read/write head receives the instruction that PDA sends, and is confirmed the concrete operations of read/write head by decoding module.Operation is divided into two big types, and one type is to the read/write head operation, comprises the frequency of operation pattern that is provided with (fixed frequency and jump frequency), after finishing dealing with information is returned to the PDA machine; Another kind of is to tag operational, reads card number comprising anti-collision, reads label and writing labels etc.; After this operational order sends through the Manchester scrambler; Wait for echo, return data is through getting into the Echo Processing module behind the FM0 demoder, data correctly then T return to PDA.

Encoder design: adopt the Manchester coding, the Manchester coding adopts level to change in 1 position window to come presentation logic " 1 " (negative edge) and logical zero (rising edge).The Manchester coding characteristic, " 10 " representative data " 1 ", " 01 " representative data " 0 ".According to its characteristics, cataloged procedure is following: at first fetch data, ring shift left is judged encoding operation according to shift-out bit, moves to left after 8 times, takes off data, repeats aforesaid operations, up to having sent all data, end-of-encode.Its concrete operations flow process is as shown in Figure 4.

Decoder design: adopt the decoding of FM0 coded system, its decode procedure is to judge the represented data of this window according to the sampled point in the rising edge of section start or negative edge and the position window.Setting a position window time span is T, and a kind of situation is that a window section start is a negative edge, and the sampling at this window 3/4T place is sampled as 1 position window and representes data " 0 ", is sampled as 0 position window and representes data " 1 "; Another kind of situation is that a window section start is a rising edge, and the sampling at this window 3/4T place is sampled as 1 position window and representes data " 1 ", is sampled as 0 position window and representes data " 0 ".Its concrete operations flow process is as shown in Figure 5.

Claims

1. one kind has the RF identification handhold read-write device that the crowd reads function; Comprise read/write head and the HPC that is connected with read/write head; It is characterized in that: said read/write head comprises rf chip; The radio frequency matching network circuit that is connected with rf chip, the dual-mode antenna that is connected with the radio frequency matching network circuit.

2. according to claim 1 have the crowd and read the RF identification handhold read-write device of function; It is characterized in that: described radio frequency matching network comprises shunt capacitance C14 and inductance L 1 between the sky wire pin ANT1 that is connected in parallel on rf chip nRF9E5, ANT2; ANT1 and ANT2 pin are respectively through a capacity earth; The ANT1 pin be connected in series an inductance L 3 and capacitor C 3 back ground connection, the ANT2 pin is connected in series an inductance L 2, capacitor C 15, capacitor C 16 back ground connection; Receive an end of sending out antenna, the other end ground connection of dual-mode antenna between capacitor C 15 and the capacitor C 16.

3. according to claim 1 and 2 have the crowd and read the RF identification handhold read-write device of function, and it is characterized in that: described dual-mode antenna is annular differential antennae.

4. according to claim 1 have the crowd and read the RF identification handhold read-write device of function, and it is characterized in that: this read-write equipment is the hand-held gun type.

5. according to each describedly has the crowd and read the RF identification handhold read-write device of function in the claim 1, it is characterized in that: described HPC has UART mouth, RS-232 mouth and the Ethernet interface of communicating by letter with host computer.

6. according to each describedly has the crowd and read the RF identification handhold read-write device of function in the claim 5, it is characterized in that: said Ethernet interface is the wireless ethernet mouth.