CN103927567A - System for realizing low-frequency multi-RFID label positioning - Google Patents
System for realizing low-frequency multi-RFID label positioning Download PDFInfo
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- CN103927567A CN103927567A CN201410156101.8A CN201410156101A CN103927567A CN 103927567 A CN103927567 A CN 103927567A CN 201410156101 A CN201410156101 A CN 201410156101A CN 103927567 A CN103927567 A CN 103927567A
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Abstract
The invention provides a system for realizing low-frequency multi-RFID label positioning, which comprises a 485 bus circuit, a CPU circuit and a Reader chip circuit which are mutually connected, and also comprises an antenna switching circuit, at least two antennas and RFID labels which correspond to the at least two antennas in a one-to-one manner, wherein the antenna switching circuit is respectively connected with the CPU circuit and the Reader chip circuit, the at least two antennas are both connected with the antenna switching circuit, and the antenna switching circuit responds to an output signal of a control port of the CPU circuit to switch the antenna corresponding to the RFID label to be positioned to an antenna connection port of the Reader chip circuit. The system only adopts one CPU circuit and one Reader chip circuit to realize the positioning of the plurality of RFID labels, the whole system only has one CPU, a complex communication protocol is not required to be designed, the circuit structure is simple, the stability is high, the realization is easy, and the cost is low.
Description
Technical field
The invention belongs to REID field, relate to a kind of system of identifying a plurality of low frequency RF ID.
Background technology
RFID is the abbreviation of Radio Frequency Identification, is a kind of technology of utilizing radio communication to realize contactless automatic identification, is utilize alternating magnetic field or electromagnetic field to realize contactless data transmission and reach the target of identifying object.
Different by frequency of operation, rfid system is divided into low frequency, high frequency, ultrahigh frequency and microwave several types.Low frequency rfid system because cost is low, data volume is few, distance is short, being most widely used in practice.
As shown in Figure 1, a set of complete rfid system is comprised of four parts such as cpu circuit, Reader chip circuit, antenna and RFID label T, its operating principle is for the unlimited electric wave energy being controlled Reader chip circuit by cpu circuit and go out characteristic frequency through antenna transmission is to label T, in order to drive label T that the ID Code of Inner portion is sent, now Reader chip circuit just receives this ID Code.The feature of label is to exempt from by battery, contact-free, exempts to swipe the card, thus be not afraid of dirty, and wafer password to be that the world is unique cannot copy, safe, the life-span is long.
In existing application, in order to obtain the information of a plurality of labels, need many cover rfid systems.As shown in Figure 2, each label T need to correspondingly configure an antenna, a Reader chip circuit and a cpu circuit, circuit structure more complicated.Between a plurality of CPU, also need to design related protocol and communicate coordination.Therefore be, that hardware cost or software cost are all very high.
Summary of the invention
Object of the present invention is just to overcome the deficiencies in the prior art, and a kind of simple in structure, system of being easy to many RFID of low frequency tag location of realizing is provided, and what this system was used is the radio-frequency technique that RFID technology medium frequency is 125KHz.
The object of the invention is to be achieved through the following technical solutions:
A kind of system that realizes many RFID of low frequency tag location, comprise 485 bus circuits, a cpu circuit and a Reader chip circuit, 485 bus circuits are connected with cpu circuit is two-way, cpu circuit is connected with Reader chip circuit is two-way, it is characterized in that described system also comprises an antenna switching circuit, at least two antennas and with described at least two antennas RFID label one to one, described antenna switching circuit is connected with Reader chip circuit with cpu circuit respectively, described at least two antennas are all connected with antenna switching circuit, the control signal of antenna switching circuit response cpu circuit is switched to the antenna corresponding to RFID label of needs location in the antenna connection terminal mouth of Reader chip circuit.
System of the present invention only adopts a cpu circuit and a Reader chip circuit to realize many RFID tag location, and whole system only has a CPU, does not need to design complicated communication protocol, and whole system circuit structure is simple, and stability is high, is easy to realize, and cost is low.The present invention can be widely used in the RFID asset management system, is a kind of concrete application of technology of Internet of things, has very high popularizing value.
Accompanying drawing explanation
Fig. 1 is a set of complete rfid system structural drawing;
Fig. 2 is traditional many RFID tag location system construction drawing;
Fig. 3 is many RFID of low frequency tag location system construction drawing of the present invention;
Fig. 4 is the CPU structural drawing of embodiment 1;
Fig. 5 is the antenna switching circuit structural drawing of embodiment 1;
Fig. 6 is the Reader chip circuit structure figure of embodiment 1;
Fig. 7 is the 485 bus circuit structural drawing of embodiment.
Embodiment
embodiment 1
The radio-frequency technique that the present invention is based on industrial 485 buses and 125KHz provides a kind of system that realizes many RFID of low frequency tag location, its structure as shown in Figure 3, comprise 485 bus circuits, a cpu circuit, a Reader chip circuit, an antenna switching circuit, n antenna and n with antenna RFID label (n >=2) one to one.485 bus circuits are connected with cpu circuit, and cpu circuit is connected with Reader chip circuit, and antenna switching circuit is connected with Reader chip circuit with cpu circuit respectively, and n antenna is all connected with antenna switching circuit.
Antenna switching circuit by n and antenna one to one relay form, the input end of relay connects respectively the control port that cpu circuit is corresponding, the output terminal of relay connects respectively the antenna connection terminal mouth of Reader chip circuit by corresponding antenna.
embodiment 2
The example of orientating as with 5 RFID labels, as shown in Fig. 4 ~ Fig. 7, cpu chip U1 adopts the PIC16F886 of MICROCHIP, antenna switching circuit is comprised of 5 relay U5 ~ U9, difference respective antenna J1 ~ J5, what relay adopted COSMO often opens single-pole single-throw (SPST) light coupling relay KAQY212S, and RFID read-write chip U2 adopts EM4095, the SN65HVD3082E of 485 chip U3 employing Ti.
RC1 ~ RC5 pin of PIC16F886 chip U1 provides corresponding control port to be connected with 1 pin of 5 relay U5 ~ U9 respectively, 3 pin of 5 relay U5 ~ U9 connect respectively the t1 port of RFID read-write chip U2, and 4 pin connect respectively the T2 port of RFID read-write chip by corresponding antenna J1 ~ J5.
Because each label has unique No. ID, in actual applications, a label represents an object, under reading state not, control pin (RC1-RC5) is low level, now 3 of solid-state relay, 4 bipods disconnect, and antenna (J1-J5) can not produce radiofrequency signal, and now CPU can not read label information.If CPU need to read the label corresponding with antenna, need corresponding control pin to set high level, now solid-state relay conducting, electric capacity in corresponding antenna and circuit produces LC vibration, discharge radiofrequency signal, corresponding label has obtained certain energy the radiofrequency signal of sending from antenna, activates the processor chips of label inside, thereby by radiofrequency signal, produces certain data interaction with antenna.CPU, by the output signal of demodulation Reader chip, can realize reading label.By asynchronous control solid-state relay folding, can realize the asynchronous generation LC vibration of antenna, thereby realize asynchronous the reading of label.
Claims (5)
1. a system that realizes many RFID of low frequency tag location, comprise 485 bus circuits, a cpu circuit and a Reader chip circuit, 485 bus circuits are connected with cpu circuit, cpu circuit is connected with Reader chip circuit, it is characterized in that described system also comprises an antenna switching circuit, at least two antennas and with described at least two antennas RFID label one to one, described antenna switching circuit is connected with Reader chip circuit with cpu circuit respectively, described at least two antennas are all connected with antenna switching circuit, the output signal of antenna switching circuit response cpu circuit control port is switched to the antenna corresponding to RFID label of needs location in the antenna connection terminal mouth of Reader chip circuit.
2. the system that realizes many RFID of low frequency tag location as claimed in claim 1, it is characterized in that described antenna switching circuit by with described at least two antennas one to one relay form, the input end of relay connects respectively the control port that cpu circuit is corresponding, and the output terminal of relay connects respectively the antenna connection terminal mouth of Reader chip circuit by corresponding antenna.
3. the system that realizes many RFID of low frequency tag location as claimed in claim 2, it is characterized in that described relay is for often opening single-pole single-throw (SPST) light coupling relay, 1 pin of light coupling relay connects respectively the control port that cpu circuit is corresponding, 3 pin connect respectively the t1 port of Reader chip circuit, and 4 pin connect respectively the T2 port of Reader chip circuit by corresponding antenna.
4. the system that realizes many RFID of low frequency tag location as claimed in claim 3, is characterized in that described light coupling relay adopts KAQY212S chip.
5. the system that realizes many RFID of low frequency tag location as described in as arbitrary in claim 1-4, is characterized in that described cpu circuit adopts PIC16F886 chip, and RC1 ~ RC5 pin of PIC16F886 chip provides described control port.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410156101.8A CN103927567A (en) | 2014-04-17 | 2014-04-17 | System for realizing low-frequency multi-RFID label positioning |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410156101.8A CN103927567A (en) | 2014-04-17 | 2014-04-17 | System for realizing low-frequency multi-RFID label positioning |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108665694A (en) * | 2017-03-29 | 2018-10-16 | 北京泛辰信安科技有限公司 | A method of electric power terminal device is monitored based on intelligent perception technology |
| CN108665693A (en) * | 2017-03-29 | 2018-10-16 | 北京泛辰信安科技有限公司 | One kind realizing intelligent monitoring electric power terminal device based on double interfaces ESAM modules |
| CN113420573A (en) * | 2020-09-23 | 2021-09-21 | 阿里巴巴集团控股有限公司 | Phased array system and phase setting method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108665694A (en) * | 2017-03-29 | 2018-10-16 | 北京泛辰信安科技有限公司 | A method of electric power terminal device is monitored based on intelligent perception technology |
| CN108665693A (en) * | 2017-03-29 | 2018-10-16 | 北京泛辰信安科技有限公司 | One kind realizing intelligent monitoring electric power terminal device based on double interfaces ESAM modules |
| CN113420573A (en) * | 2020-09-23 | 2021-09-21 | 阿里巴巴集团控股有限公司 | Phased array system and phase setting method |
| CN113420573B (en) * | 2020-09-23 | 2023-12-15 | 阿里巴巴集团控股有限公司 | Phased array system and phase setting method |
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Application publication date: 20140716 |