CN101458876B - Wireless communication transceiving module for communication principle experiment teaching system - Google Patents
Wireless communication transceiving module for communication principle experiment teaching system Download PDFInfo
- Publication number
- CN101458876B CN101458876B CN2008100722962A CN200810072296A CN101458876B CN 101458876 B CN101458876 B CN 101458876B CN 2008100722962 A CN2008100722962 A CN 2008100722962A CN 200810072296 A CN200810072296 A CN 200810072296A CN 101458876 B CN101458876 B CN 101458876B
- Authority
- CN
- China
- Prior art keywords
- circuit
- input end
- processor
- shift register
- output
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Mobile Radio Communication Systems (AREA)
Abstract
A wireless communication transceiver module for communication principle experiment teaching system relates to a digital signal wireless communication transceiver module, which is suitable for short distance wireless communication, has strong interference resistance and high data speed. The wireless communication transceiver module comprises an emission module and a receiving module, wherein the emission module is provided with a digital signal source, a NRZ signal collection circuit, a processor, a coding circuit, an emission circuit and an emission antenna, and the receiving module comprises a receiving antenna, a receiving circuit, a decoding circuit, a processor, a NRZ signal recovery circuit and a terminal display circuit.
Description
Technical field
The present invention relates to a kind of digital signal wireless communication transceiver module, especially relate to a kind of digital signal wireless communication transceiver module that is used for undergraduate education communication theory experiment course teaching system.
Background technology
From early stage infrared communication technology, the short-distance wireless communication technology that comprises UWB, Zigbee, RFID and bluetooth etc. till now moves to maturity just day by day, using paces constantly accelerates, various short-distance wireless communication technologies will be played the part of more and more important role in robotization control and household's IT application field, play an increasingly important role.
Along with development of Communication Technique, Principle of Communication has become course very important in the colleges and universities, communication theory experiment just becomes the important tool of auxiliary this subject theory study, realization that by experiment can the firsthand experience communication system and the wherein work characteristics and the meaning of each link.The communication theory experiment tutoring system generally is to adopt the separate modular structural design, and each standalone module can be installed and make up easily, becomes the open architecture test platform, helps system experimentation and unit experiment, also is convenient to carry out the secondary experimental development.
Colleges and universities' communication theory experiment content generally includes: the ideal communication channel simulated experiment, FM/AM/PAM modulation experiment, digital baseband signal experiment sign indicating number types such as (compile/translate experiment) RZ/CMI/HDB3/AMI, digital modulation experiment (2ASK/2FSK/2PSK/2DPSK etc.), the digital demodulation experiment, the phaselocked loop experiment, the Extraction of Bit Synchronization Signal experiment, frame synchronizing signal is extracted experiment, analog signal digital experiment (PCM/ADPCM//Δ M/CVSD), the telephone communication experiment, the Computer Data Communication experiment, the analog communication system experiment, experiment of digital communication system ensemble and compunication emulation experiment etc.
At present, in the communication theory experiment tutoring system, the part experimental system can provide QPSK modulation experiment, but substantially all is based on the experiment of mobile communication system, wherein relates to the deeper content of CDMA geometric ratio undergraduate course Principle of Communication.The experiment that minority relates to radio communication mainly contains following a few class:
1.FM frequency modulation transmitting-receiving experiment.Frequency modulation transmitting-receiving experiment is many, and input signal is the sine wave signal of audiorange in the High-Frenquency Electronic Circuit experimental system, and the knowwhy that relates to is mixing in the electronic circuit substantially, and knowledge such as filtering are related less with the Principle of Communication course.
2.QPSK frequency modulation transmitting-receiving experiment.Frequency modulation transmitting-receiving experiment exists in the mobile communication experimental system that has, can carry out QPSK modulation and emission, itself be equivalent to a CDMA mobile phone, the experimental project that carries out mainly is relevant CDMA and handset call, the experiment of aspects such as interface, compare difficulty and gap is highly all arranged with the undergraduate course communication theory experiment.
3. radio remote control switch experiment.The experiment of this class has two kinds of infrared receiving/transmission and 315M (or 433M), and what finish all is that wireless remote control gauge tap or LED show etc.Sending of signal generally is switch, with the circuit state of wireless situation control receiving end.
4.RFID experiment module.The experiment of rfid interrogator provides rfid card sheet and read write line and operation system interface, shows the card content, by the programming experiment card data is read and write.
During the communication theory experiment teaching, often tens systems carry out the experiment of digital signal wireless transmission simultaneously in a laboratory, each organize signal each other interference and the high data rate of signal source signal NRZ be the key factor that limiting module operate as normal and experiment are carried out smoothly.For this reason, design originally utilizes single-chip microcomputer to gather the NRZ signal, encode and geocoding by single-chip microcomputer again, thereby above-mentioned two difficult points have successfully been overcome, both obtained output data, and can use existing chip and module to reach the purpose of the emission wireless signal that slows down again smoothly according to radiating circuit requirement speed.Simultaneously, owing to adopted geocoding, therefore solved the mutual interference problem of the signal in the laboratory.Receiving circuit is then checked geocoding, solves behind the valid data and does the sampling judgement with bit synchronization signal, can recover original NRZ signal.Send even carry out signal with identical carrier wave like this,, just can accurately receive coherent signal as long as geocoding has nothing in common with each other.Simultaneously, because the adding of single-chip microcomputer has been arranged, make and to carry out abundant more processing to data.
So far do not see relevant with single-chip microcomputer to the NRZ signal as information parameter collection and processing, be used in combination existing chip, module again and successfully be applied to the report of the digital communication radio receiving transmitting module of communication theory experiment system.
Summary of the invention
The object of the present invention is to provide a kind of short-distance wireless communication that is suitable for, antijamming capability is stronger, the radio communication transceiver module that is used for the communication theory experiment tutoring system that data rate is higher.
The present invention is provided with transmitter module and receiver module; Transmitter module is provided with derived digital signal, NRZ signal acquisition circuit, processor, coding circuit, radiating circuit and emitting antenna, and receiver module is provided with receiving antenna, receiving circuit, decoding circuit, processor, NRZ signal recovery circuitry and terminal display circuit; The input termination derived digital signal output terminal of NRZ signal acquisition circuit, the input end of the output termination coding circuit of NRZ signal acquisition circuit, the input end on the output terminal sending and receiving radio road of coding circuit, antenna is penetrated in the sending and receiving of radiating circuit output terminal.The input termination receiving antenna of receiving circuit, the input end of the output termination decoding circuit of receiving circuit, the input end of the output termination NRZ signal recovery circuitry of decoding circuit, the input end of the output termination processor of NRZ signal recovery circuitry, the output termination terminal display of processor.
The NRZ signal acquisition circuit can be provided with shift register, counter and not gate, the input termination derived digital signal of shift register (derived digital signal comprises information code NRZ and bit synchronization signal BS derived digital signal), the input end of the output termination processor of shift register, the output terminal of shift register also connects the input end of counter through not gate.Counter preferably is provided with output buffer, the input end of the output termination processor of output buffer.
Coding circuit can be provided with coding chip, charactron and wire jumper, the NRZ signal output part of the input termination processor of coding chip, and the geocoding termination wire jumper of coding chip, the coded signal output terminal of coding chip is through the input end on charactron sending and receiving radio road.
Decoding circuit can be provided with decoding chip, charactron and wire jumper, and the output terminal of decoding chip connects the input end of NRZ signal recovery circuitry, the address decoder termination wire jumper of decoding chip through charactron.
The NRZ signal recovery circuitry can be provided with shift register, counter, trigger and not gate, the data input pin of shift register connects the output terminal of receiving circuit, the data output end of shift register connects the input end of the input end sum counter of processor respectively, the data output end of counter connects the input end of trigger, the output termination terminal display of trigger through not gate.
Processor in transmitter module and the receiver module can be single-chip microcomputer, the preferred 89S52 type of the model of single-chip microcomputer.
In the NRZ signal acquisition circuit, shift register is for sealing in and going out the formula shift register, and the model of shift register is selected 74HC595 for use, and the model of counter is selected 74LS160 for use, and the model of not gate is selected 74LS04 for use.
In coding circuit, the preferred PT2262 of the model of coding chip.
In decoding circuit, the preferred PT2272 of the model of decoding chip.
In the NRZ signal recovery circuitry, shift register is gone here and there out the formula shift register for incorporating into, and the model of shift register is selected 74LS165 for use, and the model of counter is selected 74LS160 for use, and the model of trigger is selected 74LS74 for use, and the model of not gate is selected 74LS04 for use.
Below in conjunction with principle of work beneficial effect of the present invention is described: when the present invention is applied in communication theory experiment system, can be exactly with 24 bit data collections and input single-chip microcomputer, through string and after handling, the bit rate of NRZ signal reduces by 8 times, convenience is provided for the signal Processing of back, make single-chip microcomputer have time enough to carry out data processing and storage, and program is very terse understandable.Because the present invention uses SI PO shift register, be beneficial to register and read in stable NRZ signal, and guarantee the data rate height.Adding communication theory experiment system of the present invention compares with domestic like product, the system of having filled up lacks the blank of digital communication radio receiving transmitting module, compare with external existing wireless communications module then have more size reasonable, simple in structure, be beneficial to teaching and use and low cost and other advantages.Application of the present invention is for the course of containing of way of extensive experimentation system, and the developing students ' visual field more closely combines the communication theory experiment course with modern communications, significant.The present invention is that a cover relates to also/also multi-door subject knowledge such as string conversion and scm software technology of data acquisition, channel encode-decode, wireless receiving and dispatching, antenna, sampling judgement, string, comprehensive stronger transceiver module.The present invention simultaneously have antijamming capability strong, receive and send messages that capacity is big, the speed advantages of higher, and NRZ ' signal that receiving end obtains is in full accord with the NRZ signal of signal source transmission.The present invention is in conjunction with the characteristics of NRZ signal and the processing power of single-chip microcomputer, adopts NRZ signal acquisition circuit and sampling judgement output circuit, to input signal speed from kHz more than 100 to the 1MHz frequency range, all can carry out data acquisition.NRZ signals collecting/restoring circuit has solved two-forty transmission of Information problem, and the coding/decoding circuit has solved the anti-interference problem in the signal wireless transmission course.Chnnel coding of the present invention and decoding circuit can adopt coding/decoding chip PT2262/PT2272.The design coding is stable, be subjected to external environment influence little, the pulsewidth of each digit pulse all is stable and accurate, its geocoding end can provide a large amount of addresses (as 531441 addresses can be provided among the embodiment, adopt the mode of 8 bit address, 4 bit data, 6561 kinds of address modes can be provided altogether), the number of student in the laboratory fully satisfies the needs of experimental teaching.In addition, of the present invention simple in structure, cost of manufacture is low, be easy to and existing experimental system cooperation.
Description of drawings
Fig. 1 is the schematic block circuit diagram of the embodiment of the invention.
Fig. 2 is that the transmitter module circuit of the embodiment of the invention is formed schematic diagram.
Fig. 3 is the NRZ signal acquisition circuit theory of constitution figure among Fig. 2.
Fig. 4 is the coding circuit theory of constitution figure among Fig. 2.
Fig. 5 is that the receiver module circuit of the embodiment of the invention is formed schematic diagram.
Fig. 6 is the NRZ signal recovery circuitry theory of constitution figure among Fig. 5.
Fig. 7 is the decoding circuit theory of constitution figure among Fig. 5.
Receipts/signalling contrast the synoptic diagram that adopts oscillograph to detect when Fig. 8 uses for the embodiment of the invention.
Embodiment
The invention will be further described below in conjunction with drawings and Examples.
Referring to Fig. 1, transmitter module is provided with derived digital signal 1, NRZ signal acquisition circuit 2, coding circuit 3, radiating circuit 4 and emitting antenna E1.Receiver module is provided with receiving antenna E2, receiving circuit 5, decoding circuit 6, NRZ signal recovery circuitry 7 and terminal display circuit 8.The signal of derived digital signal 1 is gathered by NRZ signal acquisition circuit 2, encoded then circuit 3 coded datas, and coded data is sent by emitting antenna E1 by radiating circuit 4.Receiving circuit 5 receives the signal of being launched by emitting antenna E1 through receiving antenna E2, the signal output part of receiving circuit 5 connects the data input pin of decoding circuit 6, through decoding circuit 6 decoded datas, decoded data output termination NRZ signal recovery circuitry 7 signal input parts, the signal output part of NRZ signal recovery circuitry 7 connects terminal display circuit 8.
Referring to Fig. 2～4, in Fig. 2, transmitter module of the present invention is provided with NRZ signal acquisition circuit, single-chip microcomputer U1 (89S52 type), coding circuit, radiating circuit and emitting antenna E1, the NRZ signal acquisition circuit connects information code NRZ and bit synchronization signal BS derived digital signal, the signal output part of NRZ signal acquisition circuit connects the signal input part of coding circuit, the signal input part on the signal output part sending and receiving radio road of coding circuit, radiating circuit is by transmission antennas transmit wireless signal ripple.In Fig. 3, the NRZ signal acquisition circuit is provided with SI PO shift register U2 (74HC595 type), counter U3 (74LS160 type), 2 not gate M1 and M2A (being the 74LS04 type).Its principle of work is: the information code NRZ and relevant two points of bit synchronization signal BS from derived digital signal access Acquisition Circuit that with lead with speed are 170.5kHz respectively.With BS is clock, the NRZ signal of serial is shifted successively enters shift register, by counter BS is counted, produce a carry signal per 8 times, with the store clock of carry signal as shift register, after the 8th data arrive this 8 bit data is placed on the output buffer TC, simultaneously as the outer interruption 0 (INT0) of single-chip microcomputer U1, single-chip microcomputer U1 has no progeny in outside receiving data is read in pin INTOP3.2.So carry out 3 times, can be exactly with 24 bit data collections and input single-chip microcomputer U1.Through such string and after handling, the bit rate of NRZ signal reduces by 8 times, convenience is provided for the signal Processing of back, make single-chip microcomputer U1 have time enough to carry out data processing and storage, and program is very terse understandable.Using not gate is to be beneficial to register to read in stable NRZ signal.In Fig. 4, coding circuit is provided with coding chip U4 (PT2262 type), 4 LED charactrons and wire jumper etc.Its principle of work is: the NRZ signal is from P2.4, P2.5, P2.6 and the output of 2.7 pins of single-chip microcomputer U1, and this moment, data were divided into 6 groups, and 4 every group, by D3, D2, D1 and D0 pin input coding chip U4 (PT2262 type).Geocoding end at coding chip U4 (PT2262 type) adopts the wire jumper connected mode, and every cover system utilizes the wire jumper connection that the address end of encoding and decoding chip U4 (PT2262 type) is consistent.Coded signal constitutes a complete code word by address code, numeric data code and synchronous code, exports the data input pin of radiating circuit to from the DOUT pin.Added certain time-delay between every group of data, data by the time intuitively shown by 4 LED charactrons, and have certain hour to be convenient at interval observe.
Referring to Fig. 5～7, in Fig. 5, receiver module of the present invention is provided with receiving antenna E2, receiving circuit, decoding circuit, single-chip microcomputer U11 (89S52 type), NRZ signal recovery circuitry and terminal display circuit.Receiving antenna E2 receives the wireless signal ripple that the emitting antenna E1 by transmitter module is launched, the wireless signal ripple reaches the input end of receiving circuit, the signal output part of receiving circuit connects the data input pin of decoding circuit, the data output end of decoding circuit connects NRZ signal recovery circuitry signal input part, the signal output part of NRZ signal recovery circuitry connects single-chip microcomputer U11 input end, single-chip microcomputer U11 output termination end display circuit.In Fig. 6, the NRZ signal recovery circuitry is provided with to incorporate into goes here and there out shift register U10 (74LS165 type), counter U7 (74LS160 type), trigger U9 (74LS74 type), 2 not gate M9A and M10A (being the 74LS04 type) etc.Its principle of work is the inverse process of the NRZ Acquisition Circuit of transmitter module.With the clock of BS as counter U7 (74LS160 type) and trigger U9 (74LS74 type), with after the BS negate as the clock of shift register U10, it is stable to be beneficial to output.With after the Q3 negate of counter U7 (74LS160 type) as the outer interruption 1 (INT1) of single-chip microcomputer U11, put several signals as shift register U10 (74LS165 type) parallel after the carry signal TC negate.The negative edge of the Q3 of counter U7 (74LS160 type) is than the Zao one-period of carry signal, therefore after the Q3 negative edge, single-chip microcomputer U11 receives outer interruption 1, parallel data is outputed to the INT1P3.3 port, after the negative edge of carry signal TC is come, these data are loaded onto among the shift register U10 (74LS165 type), and export from the Q7 pin serial-shift of U10 (74LS165 type) with the speed of 170.5kHz.The serial signal of output is sampled judgement guaranteeing that symbol width is identical and be the triggering of BS rising edge through trigger U9 (74LS74 type), thereby recovers the NRZ signal.In Fig. 7, decoding circuit is provided with decoding chip U8 (PT2272 type), 4 LED charactrons and wire jumper etc.Its principle of work is: receiving circuit is imported decoding chip U8 (PT2272 type) with the data that receive by the DIN pin, the address decoder end of decoding chip U8 (PT2272 type) adopts wire jumper to connect, and is consistent with the address end of the coding chip U4 (PT2262 type) of transmitter module.The signal that decoding chip U8 (PT2272 type) obtains with address code after relatively checking for twice at pin VT output high level, this moment, corresponding data pins D0, D1, D2 and D3 also exported high level.The negate of VT end signal is taken decoded data as outer look-at-me away by pin P3.2 (INT0) notice single-chip microcomputer U11, and D0, D1, D2 and D3 connect P1.3, P1.2, P1.1P and 1.0 pins of single-chip microcomputer U11.
The transmitter module of the embodiment of the invention and the single-chip microcomputer of receiver module all adopt the 89S52 type, and emitting antenna E1 and receiving antenna E1 all adopt the telescopic antenna of taking from 315M automobile remote-control device.The software design of single-chip microcomputer and transmit/receive antenna shape, size etc. can be chosen according to actual request for utilization.
As shown in Figure 8, adopt the oscillograph testing result: the NRZ signal source that NRZ ' signal that receiver obtains and transmitter are gathered is in full accord.
Claims (7)
1. be used for the radio communication transceiver module of communication theory experiment tutoring system, it is characterized in that being provided with transmitter module and receiver module; Transmitter module is provided with derived digital signal, NRZ signal acquisition circuit, processor, coding circuit, radiating circuit and emitting antenna, the input termination derived digital signal output terminal of NRZ signal acquisition circuit, the input end of the output termination processor of NRZ signal acquisition circuit, the input end of the output termination coding circuit of processor, the input end on the output terminal sending and receiving radio road of coding circuit, antenna is penetrated in the sending and receiving of radiating circuit output terminal; Receiver module is provided with receiving antenna, receiving circuit, decoding circuit, processor, NRZ signal recovery circuitry and terminal display circuit, the input termination receiving antenna of receiving circuit, the input end of the output termination decoding circuit of receiving circuit, the input end of the output termination NRZ signal recovery circuitry of decoding circuit, the input end of the output termination processor of NRZ signal recovery circuitry, the output termination end display circuit of processor;
Described NRZ signal acquisition circuit is provided with shift register, counter and not gate, the input termination derived digital signal of shift register, the input end of the output termination processor of shift register, the output terminal of shift register also connects the input end of counter through not gate, described counter is provided with output buffer, the input end of the output termination processor of output buffer.
2. the radio communication transceiver module that is used for the communication theory experiment tutoring system as claimed in claim 1, it is characterized in that coding circuit is provided with coding chip, charactron and wire jumper, the NRZ signal output part of the input termination processor of coding chip, the geocoding termination wire jumper of coding chip, the coded signal output terminal of coding chip is through the input end on charactron sending and receiving radio road.
3. the radio communication transceiver module that is used for the communication theory experiment tutoring system as claimed in claim 1, it is characterized in that decoding circuit is provided with decoding chip, charactron and wire jumper, the output terminal of decoding chip connects the input end of NRZ signal recovery circuitry, the address decoder termination wire jumper of decoding chip through charactron.
4. the radio communication transceiver module that is used for the communication theory experiment tutoring system as claimed in claim 1, it is characterized in that the NRZ signal recovery circuitry is provided with shift register, counter, trigger and not gate, the data input pin of shift register connects the output terminal of decoding circuit, the data output end of shift register connects the input end of the input end sum counter of processor respectively, the data output end of counter connects the input end of trigger, the output termination terminal display of trigger through not gate.
5. the radio communication transceiver module that is used for the communication theory experiment tutoring system as claimed in claim 1, the processor that it is characterized in that transmitter module is a single-chip microcomputer, the processor of receiver module is a single-chip microcomputer.
6. the radio communication transceiver module that is used for the communication theory experiment tutoring system as claimed in claim 1, the shift register that it is characterized in that the NRZ signal acquisition circuit is for sealing in and going out the formula shift register.
7. the radio communication transceiver module that is used for the communication theory experiment tutoring system as claimed in claim 4, the shift register that it is characterized in that the NRZ signal recovery circuitry is gone here and there out the formula shift register for incorporating into.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100722962A CN101458876B (en) | 2008-12-05 | 2008-12-05 | Wireless communication transceiving module for communication principle experiment teaching system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100722962A CN101458876B (en) | 2008-12-05 | 2008-12-05 | Wireless communication transceiving module for communication principle experiment teaching system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101458876A CN101458876A (en) | 2009-06-17 |
| CN101458876B true CN101458876B (en) | 2010-08-11 |
Family
ID=40769715
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008100722962A Expired - Fee Related CN101458876B (en) | 2008-12-05 | 2008-12-05 | Wireless communication transceiving module for communication principle experiment teaching system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101458876B (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103095622B (en) * | 2011-11-01 | 2016-12-28 | 上海华虹集成电路有限责任公司 | A kind of bpsk signal restoring circuit being applicable to ISO14443 agreement |
| CN104794952A (en) * | 2015-05-14 | 2015-07-22 | 北京交通大学 | Teaching experiment system and teaching experiment method of transponder system |
| CN105761589A (en) * | 2016-04-15 | 2016-07-13 | 河南师范大学 | Multifunction digital circuit teaching demonstration instrument |
| CN109003492B (en) * | 2018-07-25 | 2021-01-05 | 厦门大学附属心血管病医院(厦门市心脏中心) | Topic selection device and terminal equipment |
| CN109859584A (en) * | 2019-02-19 | 2019-06-07 | 北京工业大学 | A kind of experimental method and platform of communication/high-frequency circuit and system |
| CN109830098A (en) * | 2019-03-11 | 2019-05-31 | 攀枝花学院 | Infrared encoder and infrared communication device based on FPGA |
-
2008
- 2008-12-05 CN CN2008100722962A patent/CN101458876B/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN101458876A (en) | 2009-06-17 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101458876B (en) | Wireless communication transceiving module for communication principle experiment teaching system | |
| CN201721467U (en) | Novel portable comprehensive test instrument for dispatching train | |
| CN201277062Y (en) | Mine water trouble monitoring and intelligent early-warning system | |
| CN202551346U (en) | System for positioning underground locomotive of coal mine based on ZigBee and geographic information system (GIS) | |
| CN101404559B (en) | Short-distance wireless communication anti-interference simple encoding and decoding method for single-chip | |
| CN101609604A (en) | The control method of infrared learning | |
| CN202189458U (en) | Automatic meter reading system | |
| CN202195859U (en) | Real-time water level long-distance measuring control device | |
| CN105427569A (en) | Intelligent meter reading system and meter reading method thereof | |
| CN202798743U (en) | Dual-time-service concentrator | |
| CN201742420U (en) | Portable general detecting equipment | |
| CN101241360A (en) | Universal monitoring system collection end control system | |
| CN2924672Y (en) | Pulse coding-decoding communication interface system with two-way data communication function | |
| CN104598946B (en) | A kind of method of testing of the minimum triggering power of the RFID label tag based on virtual instrument | |
| CN201965746U (en) | Remote control encoding circuit based on FPGA (Field Programmable Gate Array) | |
| CN202735421U (en) | Metering automation intelligent terminal testing device | |
| CN204650809U (en) | The teaching experiment system of responder system | |
| CN201035138Y (en) | Bluetooth down-hole radio locating base station | |
| CN203070277U (en) | System for data transmission by reusing USB interface | |
| CN209311586U (en) | A kind of artillery command information system communication equipment complex detection device | |
| CN202856782U (en) | Automatic receiving/transmitting and converting device for HART communication signals | |
| CN201826897U (en) | Mine safety monitoring system based on ZigBee and GSM | |
| CN212519049U (en) | Alarm transmission system for monitoring vibration of wind driven generator | |
| CN202615592U (en) | Handheld meter reading machine for remote transmission meter | |
| CN203310506U (en) | Portable weight measurement scanner |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100811 Termination date: 20121205 |