CN2904118Y - High-speed remote-passive RF tag reader-writer - Google Patents
High-speed remote-passive RF tag reader-writer Download PDFInfo
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- CN2904118Y CN2904118Y CN 200620054988 CN200620054988U CN2904118Y CN 2904118 Y CN2904118 Y CN 2904118Y CN 200620054988 CN200620054988 CN 200620054988 CN 200620054988 U CN200620054988 U CN 200620054988U CN 2904118 Y CN2904118 Y CN 2904118Y
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Abstract
The utility model discloses a high speed remote passive RF label reader-writer. The technical scheme of the utility model is to change an structure of second mixing circuit, usually used at a microwave receiver, into a structure of direct zero-IF demodulation circuit so that the utility model can rapidly demodulate direct the electronic label signal from the echo signal of the electronic label and thereby bypass the complexity and difficulty of the second mixing technology usually adopted by the microwave receiver and at the same time improve the receiving reliability of an system. Because the zero-IF demodulation and RF transmitting channel all adopts an same signal source (PLL), such a saving can both be easy to be realized and lower the cost. Moreover, such a saving can improve the system reliability.
Description
Technical field
The utility model relates to a kind of electronic label read/write, particularly a kind of high-speed remote-passive RF tag reader-writer.
Background technology
Radio frequency label read-write system claims again rfid system, generally is comprised of read write line, electronic tag and antenna. The electronic tag in this field is divided into passive label (Passive tags) and active label (Active tags) two kinds at present. Initiatively label self is with powered battery, and read/write distance is far away, and volume is larger simultaneously, and to compare cost higher with passive label, is also referred to as active label. The required energy of elect magnetic field acquisition work that passive label is produced by reader, cost is very low and have very long service life, and less also lighter than active label, reading/writing distance is then nearer, is also referred to as passive label. Wireless radio frequency is identified the operating frequency that employed frequency is called as rfid system, basically is divided into 3 scopes: low frequency (30kHz-300kHz), high frequency (3MHz-30MHz) and hyperfrequency (300MHz-3GHz). Common operating frequency has low frequency (125kHz, 134.2kHz) and high frequency (13.56MHz) and hyperfrequency (900MHz, 2.4GHz) etc. The utility model is to belong to the wireless radio frequency identification of hyperfrequency (UHF) passive type (RFID) technical field.
But the technical indicator of existing passive radio frequency electronic label read/write is
(1) reading/writing distance: 10cm～6m;
(2) read or write speed: reading 32bits is more than the 20ms, and writing 32bits is more than the 50ms;
(3) transmitting power adjustment: by hardware, the artificial adjustment, more complicated, difficulty is large;
(4) transmitting power flatness:＞0.5dBm;
(5) traffic rate:＜19200bps;
(6) data-interface: model is RS-232 or RJ-45.
At reading/writing distance, read or write speed, reliability, antijamming capability and intelligent product and all Shortcomings easy to use.
The utility model content
The technical problems to be solved in the utility model provides that a kind of reading/writing distance is far away, read or write speed is fast, reliability and the strong passive radio frequency electronic label read/write of antijamming capability.
In order to solve the problems of the technologies described above, the utility model provides a kind of high-speed remote-passive RF tag reader-writer, its special character, comprise antenna, circulator, the radio frequency transmission channel, the radio frequency reception passage, field programmable gate array, single-chip microcomputer, serial line interface, combined communication interface and phaselocked loop frequency synthesizer, described radio frequency radiating circuit is by low-noise amplifier, modulator and power amplifier are composed in series successively, described radio frequency reception passage is by demodulator, pulse amplifier and comparison shaping circuit are composed in series successively, described circulator comprises three ports and with described antenna, described power amplifier be connected demodulator and connect, described field programmable gate array is with described low-noise amplifier, described comparison shaping circuit and the single-chip microcomputer of being connected connect, described single-chip microcomputer connects with described power amplifier, described phaselocked loop frequency synthesizer is with described modulator, described demodulator and described single-chip microcomputer connect, described serial line interface connects with single-chip microcomputer, and described combined communication interface connects with described field programmable gate array and described single-chip microcomputer.
In order better to solve the problems of the technologies described above, the type of system's output interface of the high-speed remote-passive RF tag reader-writer that the utility model provides is two kinds or two or more. Wherein field programmable gate array comprises command register, command interpretation state machine, impulse generator, Echo Processing logic device, echo latching logic device, Clock dividers and verification logic device. Described command register connects with described single-chip microcomputer; Can the generation state shift and be connected described command interpretation state machine with redirect and connect with described command register; Described command interpretation state machine is with connecting with described impulse generator; Impulse generator connects with described radio frequency transmission channel; Described Echo Processing logic device one end connects with described radio frequency reception passage, and an other end connects with echo latching logic buffer. Can provide the verification logic device of CRC to connect with single-chip microcomputer. Described phaselocked loop frequency synthesizer connects with impulse generator and command interpretation state machine by Clock dividers. Described read write line can activate the electronic tag that enters the microwave scope. Described radio frequency transmitting power is by computer software control. The signal ground current potential separates with the power supply earth potential. The modulation signal that returns from label directly is demodulated into baseband signal. CRC and parity check mistake are adopted in described electronic tag communication simultaneously. Comprise that also antenna connects testing circuit.
Adopt high-speed remote-passive RF tag reader-writer of the present utility model, technique effect is to have realized that read-write capability realizes that at a machine read or write speed is fast, and antijamming capability is strong. Read-write object is the passive electronic label, and not only size is little, lightweight, long service life, price are low, and has avoided replacing battery or charging and because the trouble of the use dispute that battery causes of active electronic tag. Ability with remote reading tag data, maximum distance reach 15 meters. Quick identification label is than the fast several times of the read or write speed of general read write line. Owing to take to make up design, make not only that circuit is compact, whole hardware platform device is few, volume is little, low price, and the circuit hear rate reduces, reliability is higher, and it is stronger to adapt to the working environment ability. Use more conveniently, multiple output interface, radio-frequency power software control, antenna connect and detect and the prompting of duty acousto-optic, all provide very big convenience for the user. The utility model can be designed as has the intelligent characteristic product, can directly be connected use with industrial control unit (ICU).
The utility model can be used for article identification and data acquisition, utilizes the superperformance that the utlity model has, and will extensively be applied in following field. Warehouse logistics management: electronic tag can substitute existing bar coded sticker, and has better characteristic, and the drifting management of flowing with warehousing management and mail, parcel, aviation luggage etc. for commodity all has wide application prospects; Transportation management: highway, railway transport administration, container transportation and management etc.; Customs's management of being open to the custom: customs is open to the custom, turns goods and materials and the vehicle management of pass; Motor vehicle management: the departments such as public security, traffic are to monitoring and the management of various motor vehicles; The toll on the road and bridge: owing to the utlity model has the ability of remote high speed reading tag data, the toll on the road and bridge can not stopped and be carried out, and is particularly useful for expressway tol lcollection; Parking lot management: realize management and charge automation; Entrance guard management: comprise Vehicle And Personnel's turnover management; Explained hereafter flow process: in whole production process, monitor parts; Product false proof: utilize label built-in storage writing protection function, authenticity of products is differentiated.
Description of drawings
Fig. 1 is the utility model structure chart;
Fig. 2 is the utility model electric function structured flowchart;
Fig. 3 is the utility model pattern, information coding and order sequential chart;
Fig. 4 is the split circuit of the utility model signal ground current potential and power supply potential;
Fig. 5 is the direct zero intermediate frequency demodulator circuit of the utility model;
Fig. 6 is the utility model field programmable gate array building-block of logic;
Fig. 7 is the utility model power output control circuit;
Fig. 8 is that the utility model antenna connects testing circuit;
Fig. 9 is that the utility model self adaptation on-line software is processed block diagram;
Figure 10 is the utility model label write-protect software control block diagram;
Figure 11 is the utility model interface schematic diagram.
The specific embodiment
Accompanying drawings embodiment of the present utility model.
See also shown in Fig. 1 and 2, the utility model structurally comprises by antenna 29, circulator 1, the radio frequency transmission channel that is formed by low-noise amplifier 6, modulator 7, power amplifier 8, by demodulator 2, pulse amplifier 3, relatively the radio frequency reception passage, field programmable gate array (FPGA) 5, single-chip microcomputer (MCU) 9, the serial line interface 10 that form of shaping circuit 4, make up communication interface 11 and phaselocked loop (PLL) frequency synthesizer 12 etc. and form.
The effect of circulator 1 be with microwave transmit with microwave receiving signal isolation with separate, guarantee that microwave transmits can flow to antenna 29 and not enter the radio frequency reception passage by circulator 1 that the microwave signal of antenna 29 receptions can enter the radio frequency reception passage. The effect of radio frequency transmission channel is that the command code that will mail to label is modulated on the tranmitting frequency by modulator 7, and carries out microwave power by power amplifier 8 and amplify. The effect of radio frequency reception passage be to label by antenna reception to echo-signal process, comprise by demodulator carry out the zero intermediate frequency demodulation, by pulse amplifier 3 amplify process and relatively shaping circuit compare shaping processing etc. Field programmable gate array 5 is finished the digital control function of whole read write line, it bear the generation of label echo detection, decoding and buffer memory, modulation waveform ASK sequence and transmission, CRC (CRC) verification and with the task such as single-chip microcomputer 9 swap datas. Single-chip microcomputer 9 is processing centers of whole read write line, it want that the explanation of completing user PC machine message packet, serial communication, MCU Instruction control word produce, electronic tag data reads with write, field programmable gate array 5 data storages and download, radio-frequency power control, the control of phaselocked loop frequency etc. Serial communication interface 10 and combined communication interface 11 are finished the data communication of read write line and external equipment. Wherein, serial communication interface 10 is actually the RS-232 serial line interface of standard, and combined communication mouth 11 is that a kind of combination represents, in fact comprises Wei root mouth, RS-485 mouth and external trigger mouth. Phaselocked loop frequency synthesizer 12 provides various frequency standards for whole read write line.
Read-write object of the present utility model, namely electronic tag is the novel passive electronic label that adopts the Sahara RW9000 of U.S. SCS company series and the SENSE of our company 9000 series, its technology is carried out the ISO-18000 industry standard. Their operating frequency is ISM wave band (902～928MHz); The card memory size is 1 kilobit (kBits) (wherein 928Bits is user's application); Read or write speed: average every 32bits reads minimum about 1.4 milliseconds (ms) consuming time, writes the minimum 30ms consuming time of average every 32bits; Adopt the multiple-unit access instruction, only to the label of proprietary application system identify, read-write operation; Possess the anti-collision communications protocol, can operate simultaneously a plurality of labels; Adopt the frequency hopping technology, have very strong antijamming capability. The base material of label and packing forms have papery basic unit, the band self-adhesive encapsulation of soft film basic unit, polyvinyl chloride (PVC) basic unit, ABS encapsulation, pottery to encapsulate etc. They can be pasted on respectively the surface of the objects such as papery, plastic and glass, adopt the special stand Pasting in the metal surface.
During operation, first with the read write line power supply opening, single-chip microcomputer 9 at first passes through single-chip microcomputer---and field programmable gate array bus (address bus 59 and data/address bus 63) downloads executive software for field programmable gate circuit 5, makes field programmable gate array 5 normal operations. When the user sends order or request by serial communication interface 10 or combined communication interface 11, the order that produces the operation label of single-chip microcomputer 9 certificates, notice field programmable gate array 5 produces amplitude keying (ASK) waveform signal, mailing to the radio frequency transmission channel goes, modulated RF modulator 7, again through radio-frequency power amplifier 8, circulator 1, by antenna 29 to the space radiation microwave. Electronic tag 51 is subject to the excitation that read write line is sent microwave energy, starts working. After it receives the order of read write line, namely beam back the microwave signal of response command to read write line according to order request, received and circulator 1 by read write line enters the radio frequency reception passage by antenna 29, amplify, compare reshaper 4 shapings through demodulator 2 demodulation, pulse amplifier 3, obtain the baseband signal (DATA) of label 51, these baseband signals obtain the label echo data again after the processing such as field programmable gate array 5 samplings, digital filtering, relevant judgement, deposit in its memory, and notice single-chip microcomputer 9. Single-chip microcomputer 9 is issued the user through serial communication interface 10 or combined communication interface 11 after doing further processing from field programmable gate array 5 taking-up label informations, answers user's order or request. In addition, field programmable gate array 5 also by the power supply of radio-frequency power supply port (RF_PW) 21 control radio-frequency power amplifiers 8, makes read write line be controlled to aerial radiation electric wave; Field programmable gate array (FPGA) 5 reception antennas 29 connect the information of testing circuit (RF_JC) 22B, judge and indicate antenna 29 connection status by antenna indicator lamp (ANT) 101. Single-chip microcomputer 9 is also controlled the power output of radio-frequency power amplifier 8 by (APC); Send phaselocked loop control data (PLL_DATA) to phaselocked loop frequency synthesizer 12, adjust the frequency of phaselocked loop frequency synthesizer 12, and detect the correctness that frequency is verified in indication (PLL_DET) by phaselocked loop; Single-chip microcomputer 9 is sent echo comparison reference (REF) to the comparison shaping circuit 4 of radio frequency reception passage, for its relatively shaping.
See also shown in Figure 3ly, according to the ISO-18000 standard, in order to improve rapidity, reliability, the security of communicating by letter between electronic tag and the read write line, the communication protocol design of the utility model between read write line and label taked following measures.
It at first is arouse machine processed, the effect that wakes up is the tag activation that will enter in the reading and writing device antenna active region, the label that only is waken up could communicate with read write line, prevents the interference of other label outside the system, guarantees the reliable and accurate of read write line and native system label information exchange. Next is pattern and information coding design, the coding of the information pattern that the utility model adopts and " 0 " in order and the response and " 1 " information. The design of specific command code, the specific command code type of the utility model setting have " waking up " order, " reading " order, " writing " order, " write-protect " order, " inquiry write-protect " order etc., and its pattern and sequential are as shown in Figure 3. That these command codes have adopted is novel, distinguished special format and algorithm, has greatly increased reliability, security, high efficiency when reading and writing passive radio frequency electrical subtab. The rapid answer communication mechanism, the utility model can detect real-time to each information bit of the response message of label, fast response; In case the information of discovery mistake, at once termination recovers again, thereby has improved the information exchange speed between read write line and the label. Many label communication mechanism adopt binary system linear search tree algorithm, realize a plurality of electronic tags are carried out fast operating simultaneously. The data error-check has adopted the combined dual error-check of special CRC (CRC) and even-odd check, guarantees correctness and the reliability of electronic tag data, improves recognition accuracy. Information security, the utility model increases the special function codes such as write-protect, and the part tag storage information of appointment is implemented protection, prevents that significant data from being rewritten, and guarantees data security.
Modulation and the reception of emission and echo-signal and the effect of demodulation in order to strengthen command code adopt following scheme.
See also shown in Figure 4ly, the signal ground current potential separates with the power supply earth potential. Because high low signal amplifies simultaneously, not only the circuit working load is heavy, and the interference that causes by power supply is very large, and altogether the time, circuit is unstable at signal and power supply, and control circuit is easy to cause erroneous judgement. After having adopted the earthy split circuit of signal ground current potential and power supply, make the receive path circuit working stable, echo is clean, clear. Wherein, reg+5vr sends into the U3A3 pin of operational amplifier (U3A) (model is MAX4020) through resistance R 3, resistance R 4 dividing potential drops after electric capacity R9, the electric capacity R10 filtering. U3A1 pin current potential equals U3A4 pin current potential; Because resistance R 3 is identical with resistance R 4 sizes, so the DC potential of U3A1 pin equals 1/2 of reg+5vr place current potential, and the ac potential of U3A1 pin equals power supply ground, and reason is the alternating current bypass that electric capacity R9, electric capacity R10, electric capacity R4, electric capacity R6 form. Adopting foregoing circuit to make with the relevant signal ground power supply ground relevant with following power supply of signal separates fully.
See also shown in Figure 5ly, adopt circuit shown in it can realize direct zero intermediate frequency demodulation scheme. Directly the zero intermediate frequency demodulation scheme can directly demodulate the signal of electronic tag rapidly from the echo-signal of electronic tag, has avoided the complexity and difficulties of the secondary mixing technology of common microwave receiver employing, thereby has improved the reliability that system receives.
Its course of work is as follows, the information that tag reflection returns is sent into circulator after dual-mode antenna receives, circulator will be received and dispatched the reception signal after signal separates, be the signal that electronic tag returns, send into the orthogonal demodulation circuit that is formed by chip U73 (model is BP2C), chip U79 (model is RMS-2H), chip U70 (model is QCN-12) and chip U71 (model is RMS-2H) etc. Wherein chip U79, chip U70 are frequency mixer. Mixed frequency signal by the frequency mixer generation: difference frequency is FLO-F
RFBe F frequentlyLO+F
RF Because local oscillation signal (FLO) and the radiofrequency signal (F of radio frequency transmission channelRF) all take from same signal source, namely the phaselocked loop frequency synthesizer 12, and the signal that electronic tag returns and the radiofrequency signal of transmission channel be frequency together, therefore, difference frequency (that is intermediate frequency) FLO-F
RF=0, the modulated signal that label returns then directly is demodulated into baseband signal. With frequency FLO+F
RFMuch larger than the operating frequency of mixing and be cut.
Because the zero intermediate frequency solution is in harmonious proportion the radio frequency transmission channel with getting a signal source, namely saves a signal source, both be easy to realize, save again cost, improve simultaneously the reliability of system.
Such as Fig. 2, shown in Figure 6, it is XC2S50TQ144 that field programmable gate array 5 is selected model, its principal character is, 50,000 programmable gate, up to the block RAM resource of 32Kbit, up to 784 CLB logical resources, have 121 programmable Is/O resource, abundant internal wiring resource, its internal logic structure is as shown in Figure 6. Data/address bus 63 provides data message for command register 52, command register 52 is used for depositing the order that single-chip microcomputer 9 is sent here with and will be sent, command interpretation state machine 53 is according to the order in the command register 52, the generation state shifts and redirect, generates order data and gives ASK impulse generator 54; ASK impulse generator 54 produces and sends corresponding ASK modulation waveform to the radio frequency transmission channel according to command interpretation state machine 53 order datas. The address information that address decoder 55 translating address buses 59 provide, 56 pairs of label echo signals of Echo Processing logic device are sampled and are compared, and judge the echo data state, decode echo data, by echo latching logic device 57 buffer memorys. Simultaneously command interpretation state machine 53 produces interrupt signal, is read by single-chip microcomputer 9, does further processing. Verification logic 58 provides corresponding fast hardware CRC computing for single-chip microcomputer 9. Clock source is that the outside crystal oscillator of 40MHz provides. 59 pairs of clock sources of clock frequency division logic 13 carry out frequency division, for field programmable gate array 5 logics provide the clock signal of 0.1 microsecond (us), 1us and 90us, are used for the generation of the sequential in the various situations.
The model that single-chip microcomputer is selected is C8051F126, and its principal character is high speed 8051 kernels, instruction pipeline structure; 256 byte RAM, 8K byte XRAM, 128K byte FLASH, 64 * 4 byte Cache; 8 I/O mouths (P0～P7), thereby the general I/O pin of abundant (totally 64) is arranged; Dual uart serial ports, two 12 DAC digital to analog converters, 10 ADC analog-digital converters and 8 ADC analog-digital converters; 3.3V operating voltage.
System's output interfaces such as RS-232, RS-485 and Wiegand (Wei root) partly are provided in communication interface, RS-485 and Wiegand interface have been Duoed than general read write line, especially the Wiegand interface can be convenient, fast, neatly with various industrial control equipment seamless links, greatly increased range of application and application scenario.
System's output interfaces such as RS-232, RS-485 and Wei Gen (Wiegand) partly are provided in communication interface, RS-485 and Wiegand interface have been Duoed than general read write line, especially the Wiegand interface can be convenient, fast, neatly with various industrial control equipment seamless links, greatly increased range of application and application scenario.
See also shown in Figure 7ly, adjust not too conveniently in actual use because the radio frequency transmitting power is artificial, adjust also more complicated and difficulty, the utility model has increased the way by software control radio frequency transmitting power, brings convenience to use. U2 (model is PF01411) is power amplifier (PA), and radio frequency (RF) input signal is by the U21 pin input of U2, and the U24 pin is exported, and the U22 pin is the power control end, and control signal is from CPU. The DC potential that changes the U22 pin can change the power output of power amplifier (PA). Radio frequency power output (RFOut) obtains by test with the relation of power control input voltage amplitude, makes form and corresponding curve, and software is sent the controlling value of power control input by tabling look-up according to the radio frequency power output actual needs.
For preventing that power amplifier level output no-load, protection radio frequency power tube are not damaged, the utility model is set up antenna and is connected testing circuit. When antenna does not connect or bad connection, system's light warning then, the radio frequency power tube stops to launch radio-frequency power automatically.
See also shown in Figure 8ly, be not damaged for preventing function amplification level output no-load, protection radio frequency power tube, the utility model is set up antenna and is connected testing circuit. When antenna does not connect or bad connection, system's light warning then, the radio frequency power tube stops to launch radio-frequency power automatically. When earthing type antenna 29 is connected with read write line when good through capacitance C99, the current potential that D99 is ordered is 0 volt; And do not connect antenna 29 or during with the antenna bad connection when read write line, and when namely inductance L 99 is infinitely great, there is not pressure drop on the resistance R 99, the current potential that D99 is ordered then is+5 volts. The D99 point directly links to each other with field programmable gate array 5, and field programmable gate array 5 can be made accordingly antenna and connect whether no good, the judgement of reporting to the police and whether exporting.
As shown in figure 11, the built-in buzzer of read write line, read write line is whenever read the electronic tag signal, then sends sound, reminding user. Three light emitting diodes (LED) are set: red light 61 indication power supplys; Amber light 62 marker antennas connect; Green light 60 designation datas. This acousto-optic prompting mode provides great convenience for system integration test and field trial.
According to user's different demands that identification is used to radio frequency, three kinds of models of the utility model design are to adapt to the different application scope. The first is suitable for read-only application, and read write line only reads and is attached to the lip-deep electronic tag numbering of object with timing or triggering mode work; The second is suitable for the readable application of writing, and read write line only just carries out work after receiving control command, can carry out read or write to any memory cell on the electronic tag. The third is suitable for authorizing the readable application of writing, and read write line only just carries out work after receiving control command, and any memory cell on the electronic tag is authorized read-write operation.
Read write line comprises the self adaptation on-line software in the present embodiment, and its treatment step sees also shown in Figure 9. The purpose that adopts software control is the situation that adopts serial ports to carry out communication in order to adapt to read write line and PC machine. In order to improve the read or write speed of read write line, should use the highest communication speed. But because existing electromagnetic field environment differs, if adopt fixedly baud rate, then possibly in the large place of environmental disturbances can't communication; And in the little place of environmental disturbances, then lose time. Adopt the self adaptation on-line mode, then can according to site environment, select high as far as possible baud rate to carry out serial communication. When the principle that realizes software control is the read write line start, set baud rate 2400bps, PC also carries out online with same baud rate and read write line, after the online success, both sides select more higher leveled baud rate further online, until till can't be online, both sides remodify baud rate and are 2400bps afterwards, then carry out onlinely with maximum baud rate that can UNICOM, and carry out work with this baud rate. If occur the communication fault in the course of work, then again online, select high as far as possible communication baud rate under the current environment, thereby the assurance system is always with maximum baud rate work.
See also shown in Figure 10ly, the label write-protect is in some purposes, and the partial data of label inside can not at will be changed. In order to prevent that these data from arbitrarily being changed, to provide writing protection function is carried out in the label segment zone, can be implemented in and to read in some situation but cannot write.
The technical indicator that high-speed remote-passive RF tag reader-writer in the present embodiment can reach is listed in the table below:
| Sequence number | Content | Index |
| 1 | Operating frequency | ISM 902～928MHz (or 2.4GHz frequency range) |
| 2 | Mode of operation | Fixed frequency or frequency hopping work, frequency interval 500KHz |
| 3 | Read/write | Write electronic tag data is readable |
| 4 | Power bracket | Software control :+22dBm～+ 32dBm (instantaneous peak value) |
| 5 | Power flatness | ＜0.5dBm |
| 6 | The range of sensitivity | |
| 7 | Reading/writing distance | Maximum reading/writing distance 〉=10M (power peak is arranged on 30.8dBm, when supporting with RW9520 smart card and G900V1365 antenna) |
| 8 | Read or write speed | The average reading speed of single deck tape-recorder: every 32bits is less than the average writing speed of 10ms: every 32bits, and less than 30mS |
| 9 | Card-reading mode | Timing or signal trigger |
| 10 | Many card identifications | Adopt the anti-collision technology, have many card identifications, can process simultaneously label at most: more than 100 |
| 11 | Dynamic Recognition | Adapt to electronic tag and read write line speed of related movement:＞120Km/h |
| 12 | Many communication interfaces | RS232、RS485、Wiegand26/34 |
| 13 | Traffic rate | Reach as high as 57600bps |
| 14 | Antennal interface | One or more N-types or SMA type transmitting-receiving bidirectional interface |
| 15 | The data error detection | CRC and even-odd check [F1] |
| 16 | Data security mechanism | Write-protect and inquiry write-protect are set, can carry out the legitimacy check to electronic tag. |
| 17 | Anti-interference mechanism | Wide spectrum intelligence frequency-hopping mode |
| 18 | Prompting | Built-in buzzer, read write line are whenever read the electronic tag letter |
| Number, then send sound. | ||
| 19 | Indication | Light emitting diode (LED): red light indication power supply, the amber light marker antenna connects, the green light designation data. |
| 20 | Operating temperature | -40℃～+80℃ |
| 21 | Storage temperature | -45℃～+95℃ |
| 22 | Damp and hot | 95％(30℃) |
| 23 | Operating voltage | DC+5V/3A |
| 24 | Volume | 260×175×41mm |
Claims (9)
1, a kind of high-speed remote-passive RF tag reader-writer, it is characterized in that: comprise antenna, circulator, the radio frequency transmission channel, the radio frequency reception passage, field programmable gate array, single-chip microcomputer, serial line interface, combined communication interface and phaselocked loop frequency synthesizer, described radio frequency transmission channel is by low-noise amplifier, modulator and power amplifier are composed in series successively, described radio frequency reception passage is by demodulator, pulse amplifier and comparison shaping circuit are composed in series successively, described circulator comprises three ports and with described antenna, described power amplifier be connected demodulator and connect, described field programmable gate array is with described low-noise amplifier, described comparison shaping circuit and the single-chip microcomputer of being connected connect, described single-chip microcomputer connects with described power amplifier, described phaselocked loop frequency synthesizer is with described modulator, described demodulator and described single-chip microcomputer connect, described serial line interface connects with single-chip microcomputer, and described combined communication interface connects with described field programmable gate array and described single-chip microcomputer.
2, high-speed remote-passive RF tag reader-writer according to claim 1 is characterized in that: the type of system's output interface of this read write line is two kinds or two or more.
3, high-speed remote-passive RF tag reader-writer according to claim 1 is characterized in that: this read write line can will directly be demodulated into baseband signal from the modulation signal that extraneous electronic tag returns.
4, high-speed remote-passive RF tag reader-writer according to claim 3 is characterized in that: this read write line is communicated by letter with described electronic tag and is adopted simultaneously CRC and parity check mistake.
5, high-speed remote-passive RF tag reader-writer according to claim 1 is characterized in that: described field programmable gate array comprises command register, command interpretation state machine, impulse generator, Echo Processing logic device, echo latching logic device, Clock dividers and verification logic device; Described command register connects with described single-chip microcomputer; Can the generation state shift and be connected described command interpretation state machine with redirect and connect with described command register; Described command interpretation state machine connects with described impulse generator; The ASK impulse generator connects with described radio frequency transmission channel; Described Echo Processing logic device one end connects with described radio frequency reception passage, and an other end connects with echo latching logic buffer; Can provide the verification logic device of CRC to connect with single-chip microcomputer; Described phaselocked loop frequency synthesizer connects with impulse generator and command interpretation state machine by Clock dividers.
6, high-speed remote-passive RF tag reader-writer according to claim 1 is characterized in that: this read write line can activate the electronic tag that enters the microwave scope.
7, high-speed remote-passive RF tag reader-writer according to claim 1 is characterized in that: the radio frequency transmitting power of this read write line is by computer software control.
8, high-speed remote-passive RF tag reader-writer according to claim 1 is characterized in that: the signal ground current potential of this read write line separates with the power supply earth potential.
9, high-speed remote-passive RF tag reader-writer according to claim 1 is characterized in that: this read write line comprises that also antenna connects testing circuit.
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| CN 200620054988 CN2904118Y (en) | 2006-02-16 | 2006-02-16 | High-speed remote-passive RF tag reader-writer |
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| CN 200620054988 CN2904118Y (en) | 2006-02-16 | 2006-02-16 | High-speed remote-passive RF tag reader-writer |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102324945A (en) * | 2011-05-26 | 2012-01-18 | 大连理工大学 | Wireless wakening circuit with address filtering function |
| CN101706880B (en) * | 2009-11-20 | 2012-04-25 | 惠州市恒睿电子科技有限公司 | Receiver of ultra high frequency radio frequency identification reader |
| CN104715276A (en) * | 2015-03-30 | 2015-06-17 | 江苏物联网研究发展中心 | Modulation depth variable RFID signal generating device |
| CN105680913A (en) * | 2016-03-08 | 2016-06-15 | 李齐营 | Long distance identification apparatus |
| CN107092950A (en) * | 2008-03-27 | 2017-08-25 | 通用电气医疗集团生物科学生物方法公司 | Prevent unauthorized operation be associated disposable biological process component can gamma sterilization RFID system |
| CN107832649A (en) * | 2017-11-03 | 2018-03-23 | 锐捷网络股份有限公司 | A kind of label technique for taking inventory and equipment |
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2006
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107092950A (en) * | 2008-03-27 | 2017-08-25 | 通用电气医疗集团生物科学生物方法公司 | Prevent unauthorized operation be associated disposable biological process component can gamma sterilization RFID system |
| CN107092950B (en) * | 2008-03-27 | 2021-04-09 | 环球生命科技咨询美国有限责任公司 | Gamma sterilizable RFID system to prevent unauthorized operation of associated disposable bioprocess components |
| CN101706880B (en) * | 2009-11-20 | 2012-04-25 | 惠州市恒睿电子科技有限公司 | Receiver of ultra high frequency radio frequency identification reader |
| CN102324945A (en) * | 2011-05-26 | 2012-01-18 | 大连理工大学 | Wireless wakening circuit with address filtering function |
| CN104715276A (en) * | 2015-03-30 | 2015-06-17 | 江苏物联网研究发展中心 | Modulation depth variable RFID signal generating device |
| CN104715276B (en) * | 2015-03-30 | 2017-10-03 | 江苏物联网研究发展中心 | The variable RFID signal generation device of modulation depth |
| CN105680913A (en) * | 2016-03-08 | 2016-06-15 | 李齐营 | Long distance identification apparatus |
| CN107832649A (en) * | 2017-11-03 | 2018-03-23 | 锐捷网络股份有限公司 | A kind of label technique for taking inventory and equipment |
| CN107832649B (en) * | 2017-11-03 | 2020-12-18 | 锐捷网络股份有限公司 | Label inventory method and equipment |
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