GPRS wireless street light monitoring system
GPRS wireless street light monitoring system
First, the status of street light monitoring system
Since the reform and opening up, along with the rapid development of urban construction, while cities and towns are making great efforts to develop urban road lighting, street lights have been used for street lighting, and many landscape lighting projects have been vigorously built to beautify the night view of the city. The street light measurement and control system has been widely used in the construction of cities in China and is of great significance in saving energy, beautifying the city, and facilitating management. At present, China's street light measurement and control system uses a large number of transmission methods such as digital radio, BB machines, telephone lines, and carrier waves. Adopting the traditional data transmission radio communication mode not only requires the construction of a transmission tower, but also has a very limited coverage. It has a fixed position and cannot be moved, and the investment cost is high. The wider the coverage, the higher the construction cost. With the continuous development of urban construction, the higher the number of buildings to be built up, will hinder the communication between the tower and the terminal. Moreover, due to the effects of bad weather, other disturbances, and the difficulties of inspections, there are many drawbacks in the street lamp monitoring system. With fewer and fewer users of paging communications, the BB machine control method also faces problems such as the dissolution of the paging station. Telephone control also has difficulty in laying the lines and operating costs. Carrier communication requires a dedicated circuit for street lighting, which is difficult to achieve in most cities.
Second, the application of GPRS in street lamp monitoring system
1. System composition · Master station: It consists of computer, server, large-screen projection display device, special communication terminal, SIM card, street light intelligent measurement and control system software and printer.
· One-level terminal: It is composed of IPC, MCU, multi-control board, monitoring board, GPRS communication module, (to control each pod to need expansion power carrier module), and is connected with monitoring terminal of street lighting control monitoring cabinet. .
· Secondary terminal (optional): It is composed of single-chip microcomputer, power carrier module (EPCW) and input/output interface board. It is installed in each lamp. Single lamp turn on/off operation. Real-time monitoring of lighting and extinguishing conditions of each street lamp, power load status, lamp pole damage alarm, leakage alarm and other functions.
2. Work principle In the street light measurement and control system, the street light control device is the sub-control point, and the control room located in the street light management office forms a two-level distributed computer measurement and control system. Sub-control points are composed of high-performance single-chip microcomputers, sensors, and interfaces. They are real-time on-line controllers that perform on-off control of street lamps, and detect the current, voltage, and line status of each branch of street lamps, and can also be used in wireless communication. In the mode, it acts as a signal relay. The main control room is a system consisting of a high-performance computer, communication interface and equipment, a display, an analog screen, a printer, etc. It is generally called a host computer. The upper computer located in the main control room completes the centralized data processing of the entire system and the function of issuing commands uniformly for each sub-control point.
3. System functions 1) Remote control: The master station computer automatically controls the on/off state of street lights according to the set latitude and longitude time curve, and can also manually control the on/off state of any primary terminal and secondary terminal at the master station.
2) Telemetry: automatic inspection or random detection of each terminal lighting rate, voltage, current, power factor, active power and frequency and other operating parameters, as long as the terminal changes during automatic operation, it will immediately transmit the change data to the master station. No master station inspection is required.
3) Remote communication: Obtain information on on/off status, faults, and alarms of each terminal to ensure that the system operates effectively and normally.
4. System advantages 1) The GPRS wireless communication mode street light measurement and control system adopts GPRS wireless communication mode, and GPRS is a 2.5G packet-switched data network based on China Mobile's GSM network, so it has very good signal coverage. At present, the network has covered all provinces, municipalities directly under the Central Government and autonomous regions, and the network has spread over 240 cities. Whether in busy downtown or in remote and remote areas, GPRS can provide high-speed data services to the maximum extent without being affected by urban construction, weather and other disturbances.
2) Low investment cost The networking is simple, rapid, and flexible. There is no need to build a tower, and a dedicated network for virtual mobile data communications covering China can be built at any time through the Internet to save investment costs.
3) Low operating costs
GPRS charges according to the number of data packets received and sent, and there is no charge when no data traffic is transmitted, reducing its operating costs.
4) The advantages of real-time and stable data combination with GPRS always online, as long as the boot can automatically attach to the GPRS network, and establish a communication link with the data center, at any time to send and receive user data device data; According to China Mobile's network conditions, currently available Provides stable data transmission of 20~40kbps.
5) Multi-level control The system realizes multi-level control of night lights, midnight lights and road decoration lights respectively. 1 The monitoring center automatically issues group control switch commands according to the time curve of the switch lamp or the time of the switch lamp set by the program. 2 The operator operates in the monitoring center to implement group control, partial group control, and single-point switching light control; 3 points of control points switch lights independently according to a preset time; 4 monitoring center timing points to sub-control points Issue clock approval command, sub-control point automatically switch lights according to the time after the nuclear; 5 can be based on actual needs (such as holidays, leadership reception days, etc.), by the system flexible setting holiday lighting switch time.
6) The background is easy to operate and the confidentiality is strong. Because it can realize remote networking, it can be conveniently operated on any networked computer. It can dial the monitoring center in the field via a telephone line and browse or operate the monitoring system. The number of connected computers is not Restricted, anytime, anywhere using the public data network Internet to query data and remote control, network coverage is wide, technology is mature, data transmission is stable and reliable, monitoring center program provides multi-level operation password and automatic dynamic password protection, strong confidentiality.
Third, the conclusion
The system uses the perfect GPRS network and the superior ET1100 GPRS wireless data transmission terminal as the information exchange between the main station and the terminal. It is equipped with powerful monitoring functions of telemetry, remote control, and remote signaling, which overcomes the disadvantages of other communication monitoring systems and ensures The system is efficient, real-time, and reliable. It has a qualitative leap in the street lamp monitoring system.
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