CN201097457Y - Railway signal monitoring network system based on ZigBee - Google Patents
Railway signal monitoring network system based on ZigBee Download PDFInfo
- Publication number
- CN201097457Y CN201097457Y CNU2007200311434U2007200311434U CN200720031143U CN201097457Y CN 201097457 Y CN201097457 Y CN 201097457Y CN U2007200311434U2007200311434 U CNU2007200311434U2007200311434 U CN U2007200311434U2007200311434U CN 200720031143 U CN200720031143 U CN 200720031143U CN 201097457 Y CN201097457 Y CN 201097457Y
- Authority
- CN
- China
- Prior art keywords
- wireless
- railway signal
- detector
- signal monitoring
- network
- 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
- Train Traffic Observation, Control, And Security (AREA)
Abstract
The utility model relates to a wireless railway signal monitoring network system based on ZigBee, which comprises a wireless railway signal monitoring network module, a wireless railway signal monitoring gateway, and a railway signal monitoring controller, wherein the wireless railway signal monitoring network module comprises a signal equipment detector, a portable service alarm device, a wireless communication module and a wireless repeaters, so as to finish railway signal information data collection and network transmission. The wireless railway signal monitoring gateway is connected with the signal controller by wire and connected into a wireless communication network by the wireless communication module. The wireless railway signal monitoring gateway collects the data in the network and also receives the check and inquiry from the controller. The signal controller receives the wireless signal information collected by the wireless railway signal monitoring gateway, and outputs corresponding processed information according to the different signal type. The system has the advantages of self-adaptive property, convenient installation and maintenance, and low cost.
Description
Technical field
The utility model relates to the railway signal monitoring network system, a kind of wireless railway signal monitoring network system based on ZigBee of more specifically saying so.
Background technology
Railway signal monitoring system mainly relies on wired mode or power line carrier mode transmission of monitoring information in the prior art.Wired mode transmission of monitoring information need be at a large amount of cable of outdoor laying, thus the cost height, and monitoring project is single.Power line carrier mode transmission of monitoring information poor reliability and operation inconvenience.Railway signal monitoring system does not all possess electronic patrol function and train proximity sensing function in the prior art, and monitoring project is difficult to satisfy the instructions for use of existing railway signal maintenance system.
Summary of the invention
The utility model is for avoiding above-mentioned existing in prior technology weak point, providing a kind of facility, moderate cost, reliable operation are installed, possess the wireless railway signal monitoring network system based on ZigBee of electronic patrol function and train proximity sensing function.
The technical scheme that its technical problem that solves the utility model adopts is:
The utility model is based on the railway signal monitoring network system of ZigBee, and its system forms and comprises wireless railway signal monitoring network module, wireless monitor gateway and monitor controller:
Described wireless railway signal monitoring network module comprises signalling arrangement detector, portable maintenance warning device, wireless communication module and wireless repeater, finishes the collection and networking transmission of railway signal information data, wherein:
A, described signalling arrangement detector comprise track circuit compensation capacitance device detector, track switch breach detector, alarm for burnout of filaments detector, terrestrial information transponder detector, are used for signalling arrangement current region state is caught;
B, described portable maintenance warning device are used to accept send the instruction of the signal controller of electronic patrol and train proximity sensing;
C, described wireless communication module adopt the ZigBee communication module, link to each other with signalling arrangement detector and portable maintenance warning device, with ZigBee protocol construction cordless communication network, realize the networked wireless transmission of data;
D, described wireless repeater are realized the amplification forwarding capability of wireless signal by wireless communication module access to wireless communication network;
Described wireless railway signal monitoring gateway and described signal controller wired connection, and by a wireless communication module access to wireless communication network; By wireless railway signal monitoring gateway the data in the network are collected, accept patrolling and examining and inquiring about of self-controller simultaneously.Receive the wireless signal information that wireless railway signal monitoring gateway is collected by described signal controller,, export corresponding process information according to different signal types.
Signal controller is supported a plurality of bus loops, every loop all serve as reasons wireless monitor gateway and cordless communication network module and the common sub-network system that constitutes of described signal controller in this loop.
Track circuit compensation capacitance device detector, track switch breach detector, alarm for burnout of filaments detector, terrestrial information transponder detector adopt magnetic-inductive device, obtain the induced electricity energy from corresponding signalling arrangement lead-in wire, and the induced electricity energy is sent in electric capacity or the battery stores, be used to do the power supply of relevant ZigBee communication module.
Portable maintenance warning device comprises wireless communication module, single-chip microcomputer, battery and alarm.Portable maintenance warning device can the basis signal controller instruction send the train proximity sensing in good time.Portable maintenance warning device is patrolled and examined in the process the signal inspection personnel, transmits its positional information at the ZigBee wireless network to signal controller, and signal controller is noted down above-mentioned information, realizes electronic patrol.
Compared with prior art, the utility model beneficial effect is embodied in:
1, based on the wireless network architecture of up-to-date ZigBee technology
The ZigBee technology be specially at the wireless sensor network exploitation a kind of closely, low complex degree, low-power consumption, low data rate, two-way wireless communication technology cheaply.The utility model has adopted up-to-date ZigBee wireless communication technology, build the railway signal monitoring network system, compare with traditional wired railway signal monitoring, system installs, the complexity of debugging reduces greatly, to the destruction and the also existence hardly of transformation of original signalling arrangement.The monitoring transformation of the signalling arrangement that has come into operation for numerous domestic has very strong specific aim and practicality.
2, adaptivity flexibly
The railway signal monitoring network system that the utility model is built has the healthy and strong network system, has powerful adaptivity.Controller can be controlled route, and additions and deletions detector node can be adjusted by the basis signal equipment scale network size arbitrarily, and not increase of the complexity of installing and being provided with, and has avoided traditional wired railway signal monitoring system scale less, the drawback that flexibility is weak.
3, cheap cost
The utility model adopts the ZigBee technology to have characteristics such as low rate, low-power consumption, low cost, make current system cost drop to degree far below the wired railway signal monitoring system of tradition, and the price of ZigBee module is still in further reduction, system cost of the present utility model will be very cheap, is easy to marketing.
4, low-power consumption
The utility model can adopt the EM2420 chip of Ember company, has comprised in 802.15.4 and the ZigBee compatible system indispensable assembly in single chip, supports synchronized sleep and wakes up, has effectively reduced power consumption.Track circuit compensation capacitance device detector, track switch breach detector, alarm for burnout of filaments detector, terrestrial information transponder detector adopt magnetic-inductive device, obtain the induced electricity energy from corresponding signalling arrangement lead-in wire, and the induced electricity energy is sent in electric capacity or the battery stores, be used to do the power supply of relevant ZigBee communication module.So kill two birds with one stone, promptly monitored the state of above-mentioned signalling arrangement, avoided the replacing battery again.Wireless repeater only depends on accurate No. 5 batteries of two feast-brand marks with regard to sustainable work 6 months to 2 years, thereby has prolonged each detector node maintenance cycle, has saved corresponding man power and material.
5, information gathering promptly and accurately and transmission
The utility model can in time be caught the fault message of the said equipment by adopting high-quality track circuit compensation capacitance device detector, track switch breach detector, alarm for burnout of filaments detector, terrestrial information transponder detector; By in its wireless network transmissions, taking 8bit data mode transmission, and timed sending, patrol and examine and three kinds of transmission meanss of the output of reporting to the police are carried out co-ordination, can make information data carry out Network Transmission in the very first time; Based on the Network Transmission of ZigBee agreement, comprise strict data check, fully guaranteed the accuracy of data, effectively avoided the wrong report of signalling arrangement fault and failed to report.
6, the train proximity sensing is sent in the instruction that portable maintenance warning device can the basis signal controller in good time.Portable maintenance warning device is patrolled and examined in the process the signal inspection personnel, transmits its positional information at the ZigBee wireless network to signal controller, and signal controller writes down above-mentioned information, realizes electronic patrol.
7, data are intuitively complete
The data that the utility model inside communicates with one another comprise the several data such as instruction of track circuit compensation capacitance device integrity detection data, track switch breach detection data, alarm for burnout of filaments detection data, terrestrial information transponder integrity detection data, electronic patrol and train proximity sensing, and in the signal controller database storage and uniform, call and manage, on display screen, show simultaneously.Relevant information can be carried out data output by printer according to instruction.
Description of drawings:
Fig. 1 is the block diagram of system of the present utility model.
Fig. 2 is a network node hardware block diagram of the present utility model.
Fig. 3 is applied Ember ZigBee architecture signal in the utility model.
Fig. 4 is the applied structural representation that obtains the induced electricity energy from corresponding signalling arrangement lead-in wire in the utility model.
Embodiment
Referring to Fig. 1, the system of present embodiment forms and comprises wireless railway signal monitoring network module, wireless monitor gateway and monitor controller:
Described wireless railway signal monitoring network module comprises signalling arrangement detector, portable maintenance warning device, wireless communication module and wireless repeater, finishes the collection and networking transmission of railway signal information data, wherein:
A, described signalling arrangement detector comprise track circuit compensation capacitance device detector, track switch breach detector, alarm for burnout of filaments detector, terrestrial information transponder detector, are used for signalling arrangement current region state is caught;
B, described portable maintenance warning device are used to accept send the instruction of the signal controller of electronic patrol and train proximity sensing;
C, described wireless communication module adopt the ZigBee communication module, link to each other with signalling arrangement detector and portable maintenance warning device, with ZigBee protocol construction cordless communication network, realize the networked wireless transmission of data;
D, described wireless repeater are realized the amplification forwarding capability of wireless signal by wireless communication module access to wireless communication network;
Described wireless railway signal monitoring gateway and described signal controller wired connection, and by a wireless communication module access to wireless communication network; By wireless railway signal monitoring gateway the data in the network are collected, accept patrolling and examining and inquiring about of self-controller simultaneously.Receive the wireless signal information that wireless railway signal monitoring gateway is collected by described signal controller,, export corresponding process information according to different signal types.
In concrete the enforcement, signal controller is supported a plurality of bus loops, all serve as reasons a sub-network system of wireless railway signal monitoring gateway and wireless communication module and the common formation of described signal controller in this loop of every loop.Present embodiment can be supported 20 bus loops at most, connects a wireless railway signal monitoring gateway on each bus loop, and can maximumly support 200 nodes.Wireless repeater provides signal to amplify for large scale network and transmits.So, can maximumly support to constitute a huge Radio Network System by 4000 nodes for the individual signals controller.
Referring to Fig. 2, the detector node in the present embodiment mainly is made of three parts, comprises sensor circuit, governor circuit and wireless transceiver circuit.
Wherein, main control singlechip adopts 8 Chip Microcomputer A tmega128L of AVR kernel, and it adopts advanced RISC framework, abundant I/O is provided, and has very low power consumption.Simultaneously, it has the startup guiding function, great convenience is provided for the upgrading and the maintenance of program.
Wireless transceiver circuit adopts the EM2420 of EmberCrop, and it has comprised all indispensable assemblies in 802.15.4 and the ZigBee compatible system in single chip, merged the radio-frequency (RF) transceiver of 2.4GHz, embedded networking storehouse and the development environment of ZigBee.
Control method based on the present embodiment system is:
1, wireless communication module according to fixing message formatization, by the direct sequence spread spectrum modulation, carries out wireless network transmissions according to the ZigBee wireless communication protocol with the input signal of signal sensor then;
In this step, the input signal of signal sensor comprises the instruction simulation amount and the switching value of track circuit compensation capacitance device integrity detection data, track switch breach detection data, alarm for burnout of filaments detection data, terrestrial information transponder integrity detection data, electronic patrol and train proximity sensing, comprises following three kinds of interfaces:
A, switching value signal input interface: two I/O mouths are provided, and described I/O mouth is by the 10K grounding through resistance, and high level is imported;
B, digital signal input interface: adopt the UART interface, the agreement baud rate;
C, analog level signal input interface: provide one tunnel 8 A/D input interface, its reference voltage scalable.
| Heading | Type of message | (address) | (type) | (data) | Telegram end |
Wireless network transmissions is taked the transmission of 8bit data mode, and transmission means has three kinds: timed sending, the output of patrolling and examining and report to the police, wherein:
Patrol and examine: certain network node sends search request to it, then sends;
Timed sending: regularly send state information, for the controller record data to network node;
Report to the police and export: when surpassing early warning or alarming threshold value, initiatively send.
2, wireless railway signal monitoring gateway is collected the data message in the wireless railway signal monitoring network, by serial ports information is sent to signal controller according to signal controller compatible message form.
In concrete the enforcement, the data message that wireless railway signal monitoring gateway is collected in the wireless railway signal monitoring network is by utilizing coupled wireless communication module to realize as acquisition node.
3, signal controller analyzes and makes corresponding processing to information, comprising:
When the no signal equipment fault:
A, analysis current time, probe address, ambient temperature, track switch breach value;
B, with above-mentioned data respectively deposit in system database for the inquiry;
C, the synchronous display status information of display screen;
When the signalling arrangement fault occurring:
A, analysis current time, probe address, ambient temperature, track switch breach value;
B, startup siren, the cue equipment fault occurs;
C, the portable maintenance warning device of startup and guide maintenance personal repair faulty equipment as early as possible;
D, deposit above-mentioned data in system database and print;
E, the synchronous display status information of display screen.
4, signal controller can be controlled route, discerns wireless railway signal automatically and detects communication network module, arbitrarily the additions and deletions network node.
The hierarchical mode that Fig. 3 shows the Zigbee agreement that the utility model adopts with and with the corresponding relation of OSI network model.From a structural point, host application layer and Ember protocol stack belong to the User Defined scope as shown in the figure, and the application layer of corresponding OSI network model is to five layer protocols of network layer, and the utility model is then by the realization of Atmega128L mcu programming; Be connected with the EM2420 chip by the SPI synchronous serial interface then, finish error control and flow control in the transmission by EM2420, launch by antenna the modulation back.This part correspondence data link layer Datalink layer and physical layer Physical layer two layer protocols in the OSI network model.
Its message format is:
(1) message structure
Heading+type of message+(address)+(type)+(data)+telegram end
(2) concrete type of message and form
The Information message, dactylus point sends routine data information, message length 12B.
The 4B data refer to electric weight, temperature, concentration, switching value, down together.
The New message refers to report newly added node and data, message length 12B.
The Lost message refers to report newly added node and data, message length 12B.
The Ack message, answer signal, message length 4B.
Reply data is 0---improper replying, and 1---normal response, 2---reply request-reply simultaneously.
Receive after the message that the other side sends, generally all need make replying and successfully accept with the expression data.Normal response is also represented the existence of node, shakes hands with the maintenance of communicating by letter between the gateway as Centroid.
The Set message is provided with the switching value module, message length 9B.
After receiving the Set message, except normal response, also must after the switching value variation, pass the switch value after implementing nodal operation back.
Update message, gateway node require Centroid to transmit all node address informations again, message length 3B
The Query message, message length 12B.
When gateway receives the information that is not present in the routing table interior nodes, check and verify this node to Centroid, this information is cancelled simultaneously.Check and verify existence as Centroid, then in suitable, send the New instruction.
Simultaneously, sensor node also can serve as routing node, has the data forwarding function.Under the control of governor circuit, wireless transceiver circuit will receive data and reach main control singlechip by the SPI synchronous serial interface, single-chip microcomputer again with data from new processing, add the routing iinformation that some are necessary, pass wireless transceiver circuit back by the SPI synchronous serial interface again.
Wireless railway signal monitoring gateway mainly plays the effect of data gathering and forwarding: collect the data message in the wireless railway signal monitoring network, by serial ports information is sent to signal controller according to signal controller compatible message form.
Signal controller can use industrial control computer.Signal controller receives message, analyzes, and obtains information such as signalling arrangement fault, and handles it according to information.
Fig. 4 is the applied structural representation that obtains the induced electricity energy from corresponding signalling arrangement lead-in wire in the utility model.(1) is magnet ring among Fig. 4, can use the manganese-zinc magnetic ring of Φ 25 * 15 * 10.(2) be the lead-in wire of track circuit compensation capacitance device.(3) be the plug pin connector of track circuit compensation capacitance device.(4) be battery, can use commercially available 3.7V lithium battery, also can adopt farad capacitor.(5) be resonant capacitance, its capacity be set according to the respective track channel frequency.(6) be rectifier diode.Can adopt 1N4001, also can replace with the BL8505 boost module.Track circuit compensation capacitance device detector, track switch breach detector, alarm for burnout of filaments detector, terrestrial information transponder detector can adopt above-mentioned magnetic-inductive device, obtain the induced electricity energy from corresponding signalling arrangement lead-in wire, and the induced electricity energy is sent in electric capacity or the battery stores, be used to do the power supply of relevant ZigBee communication module.
Portable maintenance warning device comprises wireless communication module, single-chip microcomputer, battery and alarm.Portable maintenance warning device can the basis signal controller instruction send the train proximity sensing in good time.Portable maintenance warning device is patrolled and examined in the process the signal inspection personnel, transmits its positional information at the ZigBee wireless network to signal controller, and signal controller writes down above-mentioned information, realizes electronic patrol.
Claims (4)
1. based on the railway signal monitoring network system of ZigBee, it is characterized in that system's composition comprises wireless railway signal monitoring network module, wireless railway signal monitoring gateway and railway signal monitor controller:
Described wireless railway signal monitoring network module comprises signalling arrangement detector, portable maintenance warning device, wireless communication module and wireless repeater, finishes the collection and networking transmission of railway signal information data, wherein:
A, described signalling arrangement detector comprise track circuit compensation capacitance device detector, track switch breach detector, alarm for burnout of filaments detector, terrestrial information transponder detector, are used for signalling arrangement current region state is caught;
B, described portable maintenance warning device are used to accept send the instruction of the signal controller of electronic patrol and train proximity sensing;
C, described wireless communication module adopt the ZigBee communication module, link to each other with signalling arrangement detector and portable maintenance warning device, with ZigBee protocol construction cordless communication network, realize the networked wireless transmission of data;
D, described wireless repeater are realized the amplification forwarding capability of wireless signal by wireless communication module access to wireless communication network;
Described wireless railway signal monitoring gateway and described signal controller wired connection, and by a wireless communication module access to wireless communication network; By wireless railway signal monitoring gateway the data in the network are collected, accept patrolling and examining and inquiring about of self-controller simultaneously: receive the wireless signal information that wireless railway signal monitoring gateway is collected by described signal controller, according to different signal types, export corresponding process information.
2. system according to claim 1, it is characterized in that described signal controller supports a plurality of bus loops, every loop all serve as reasons wireless monitor gateway and cordless communication network module and the common sub-network system that constitutes of described signal controller in this loop.
3. system according to claim 1, it is characterized in that described track circuit compensation capacitance device detector, track switch breach detector, alarm for burnout of filaments detector, terrestrial information transponder detector adopt magnetic-inductive device, obtain the induced electricity energy from corresponding signalling arrangement lead-in wire, and the induced electricity energy is sent in electric capacity or the battery stores, be used to do the power supply of relevant ZigBee communication module.
4. system according to claim 1 is characterized in that described portable maintenance warning device comprises wireless communication module, single-chip microcomputer, battery and alarm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200311434U2007200311434U CN201097457Y (en) | 2007-01-31 | 2007-01-31 | Railway signal monitoring network system based on ZigBee |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200311434U2007200311434U CN201097457Y (en) | 2007-01-31 | 2007-01-31 | Railway signal monitoring network system based on ZigBee |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201097457Y true CN201097457Y (en) | 2008-08-06 |
Family
ID=39924497
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007200311434U2007200311434U Expired - Fee Related CN201097457Y (en) | 2007-01-31 | 2007-01-31 | Railway signal monitoring network system based on ZigBee |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201097457Y (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102035878A (en) * | 2010-10-29 | 2011-04-27 | 江苏瑞蚨通软件科技有限公司（中外合资） | Rapid turnout deployment monitoring system |
| CN101583134B (en) * | 2009-06-10 | 2012-09-05 | 耿直 | Wireless composite trunk equipment in railroad and connected transmission method |
| CN103063256A (en) * | 2013-01-18 | 2013-04-24 | 深圳市速普瑞科技有限公司 | Railway signal measurement intelligent terminal |
| CN103198608A (en) * | 2013-04-09 | 2013-07-10 | 沈阳航空航天大学 | Railway station signal device fault diagnosis and alarm system |
| CN103809054A (en) * | 2014-01-24 | 2014-05-21 | 深圳市长龙铁路电子工程有限公司 | Railway signal waveform recording/display system based on Android platform |
| CN109799773A (en) * | 2019-03-05 | 2019-05-24 | 柳州和利时科技有限责任公司 | A kind of railway outdoor signal equipment monitoring system based on NBIoT Internet of Things |
| CN114295918A (en) * | 2021-12-31 | 2022-04-08 | 国能朔黄铁路发展有限责任公司 | Measuring system for railway signal equipment |
-
2007
- 2007-01-31 CN CNU2007200311434U2007200311434U patent/CN201097457Y/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101583134B (en) * | 2009-06-10 | 2012-09-05 | 耿直 | Wireless composite trunk equipment in railroad and connected transmission method |
| CN102035878A (en) * | 2010-10-29 | 2011-04-27 | 江苏瑞蚨通软件科技有限公司（中外合资） | Rapid turnout deployment monitoring system |
| CN103063256A (en) * | 2013-01-18 | 2013-04-24 | 深圳市速普瑞科技有限公司 | Railway signal measurement intelligent terminal |
| CN103063256B (en) * | 2013-01-18 | 2015-10-28 | 深圳市速普瑞科技有限公司 | A kind of railway signal measurement intelligent terminal |
| CN103198608A (en) * | 2013-04-09 | 2013-07-10 | 沈阳航空航天大学 | Railway station signal device fault diagnosis and alarm system |
| CN103198608B (en) * | 2013-04-09 | 2015-07-01 | 沈阳航空航天大学 | Railway station signal device fault diagnosis and alarm system |
| CN103809054A (en) * | 2014-01-24 | 2014-05-21 | 深圳市长龙铁路电子工程有限公司 | Railway signal waveform recording/display system based on Android platform |
| CN103809054B (en) * | 2014-01-24 | 2016-09-14 | 深圳市长龙铁路电子工程有限公司 | A kind of railway signal waveform recording display system based on Android platform |
| CN109799773A (en) * | 2019-03-05 | 2019-05-24 | 柳州和利时科技有限责任公司 | A kind of railway outdoor signal equipment monitoring system based on NBIoT Internet of Things |
| CN114295918A (en) * | 2021-12-31 | 2022-04-08 | 国能朔黄铁路发展有限责任公司 | Measuring system for railway signal equipment |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN100517406C (en) | Wireless fire fighting detector network based on ZigBee and control method | |
| CN201097457Y (en) | Railway signal monitoring network system based on ZigBee | |
| CN207780960U (en) | A kind of wireless data acquisition system | |
| CN101763704B (en) | Intelligent home fire-fighting detection and alarm system and control method thereof | |
| CN206249548U (en) | Environmental detection set based on low power loss communication network Yu sensor integration technology | |
| CN102194304A (en) | Method and system for wireless concentrated collection and management of energy measurement data | |
| CN101713652A (en) | Intelligent multi-sensor system and working method thereof | |
| CN102841293B (en) | Fault positioning system for 10kV power distribution network circuit | |
| CN101425220A (en) | Intelligent telemetering gas meter based on wireless sensor network | |
| CN107907796A (en) | Based on LoRa communication type transient state recording trouble analysis systems | |
| CN110419066A (en) | Sensor device and sensor network system | |
| CN102169623A (en) | Distributed geological disaster monitoring and acquiring transmission instrument | |
| CN104331056A (en) | Novel intelligent indoor household wireless network communication system | |
| CN104932395B (en) | Solar photovoltaic assembly monitors the intelligent maintenance device and maintaining method of system | |
| CN201654983U (en) | Short-range wireless load monitor system based on Zigbee technology | |
| CN201887974U (en) | Remote management system of LED (light emitting diode) road lamp | |
| CN203057162U (en) | Test system of wireless micropower networking | |
| CN104807498A (en) | Farmland environment wireless monitoring system based on Zigbee and 3G technology | |
| CN103164941A (en) | Wireless remote monitoring system and wireless remote monitoring method | |
| CN201589614U (en) | Multiple-carrier channel accessed wireless communication network hydrographic multiparameter metering instrument | |
| CN107909796A (en) | A kind of compound acquisition system of dual input multilist and method | |
| CN201072594Y (en) | Wireless pressure collection and recording system | |
| CN209329781U (en) | A kind of distribution O&M monitoring device | |
| CN109920232A (en) | Electric power multi service access terminal and management system based on NB-loT | |
| CN205354313U (en) | Data acquisition device in wireless node instrument |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 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: 20080806 |