Radio Engineering Volume No.1 Remote Automatic Control System for Public Street Lights Based on Wireless Paging Network Peng Weijun Song Wentao Luo Hanwen (Department of Electronic Engineering, Shanghai Jiaotong University) This paper proposes a remote automatic control of public lighting street lights from the radio paging network. System design.
The technical system can realize the talents of the public lighting street lamp and the basin control brake by using the existing radio paging system.
The article gives a relatively complete solution from the aspects of hardware and software design.
The setting of the radio paging is not unified remotely. The public street lighting system is an important part of the city's municipal construction.
If the remote automatic control of the street lamp system can be effectively implemented, a large amount of power can be saved, and at the same time, the society can be served most effectively.
There are two main ways to control the street lamp system. The photoelectric sensor is used to determine the day and night by detecting the intensity of sunlight, thereby automatically controlling the opening and closing of the street lamp. Another way is to use wireless communication, using a dedicated The wireless communication device transmits a street light control signal that uses pulse width modulation.
The drawbacks of the first approach are obvious.
It is too disturbed by the outside world and cannot be remotely controlled as needed.
The second method provides a flexible and effective control method, but its reliability may not be guaranteed. The reliability of wireless data communication mainly depends on the height of the antenna and the distance between the central station and the controlled street lamp, and also the environment. Interference related to the other side, due to the need to use dedicated wireless communication equipment and the need to apply for a dedicated operating frequency, the cost of installation and maintenance is relatively high.
In fact, in most cities, there is a wireless communication method that covers the entire city and has reliable performance and low cost, that is, a radio paging system.
If the control commands of the street lamp system can be transmitted by means of the wireless communication link provided by the existing radio paging system, a remote control solution for controlling the free and reliable public street lighting system can be realized.
This paper is based on this idea, designed a remote control system for public street lighting based on wireless paging system.
The article discusses in detail the structure of the system and the design of hardware and software.
The basic components of the system The entire system consists of a central control station radio paging system and a remote control terminal.
The central station is responsible for the input and control of the control instructions on the 7th of the year to receive the code, providing a user interface for controlling command input.
As a link for wireless communication, the radio paging system is responsible for transmitting the control commands of the central station to the respective remote control terminals in a wireless broadcast manner.
The remote control terminal is a command execution mechanism, which is respectively disposed on the controlled street lamps, and controls the opening and closing of the street lamps or the adjustment and regrouping of the brightness according to the received central station commands.
The design of the system has two key points. First, the interface design between the central station and the radio paging system is followed by the interface design between the remote control terminal and the paging receiver.
The design center control station of the central control station consists of a command input device (computer generator telephone public telephone network and radio paging control center).
The radio paging control center here must provide an automatic paging service in order to achieve automatic transmission of control commands.
The wireless center and the paging control are in the middle of the paging control system. The central station of the transmission system mainly completes the input and coding functions of the control commands, and provides a control interface for the controller.
There are two types of control commands that can be input through a computer and through a normal telephone.
The advantage of using computer input is that a very intelligent software can be designed. The user only needs to control the remote control terminal through the menu selection according to the prompt of the interface, such as realizing the opening and closing of the street light in a certain area or area or It is the adjustment of the brightness, and the street lights can be regrouped.
Under the control of the software, unattended automatic control can also be realized.
After receiving the controller's control command, the computer expresses it in a predetermined encoded command format and then sends the command from the communication serial port.
Since the telephone line only supports the transmission of analog signals, it is necessary to design a dual-tone multi-frequency generator.
Its function is to convert the command in binary form sent by the computer through the communication serial port into a code, that is, a ten-digit number, and then signal it, and then send the signal to the telephone line.
The generator is required here because the automatic connection device of the automatic radio paging system can only recognize the dual tone multi-frequency signal.
Another method of inputting commands is to use ordinary telephone button input.
For the sake of peers, the phone here can only use audio phones and not pulse dial phones.
This type of input requires manual operation and the need to remember the format of various commands, so the degree of automation is not high and can only be used as an auxiliary and alternate command input means.
The control command expressed in the form is transmitted to the automatic connection device of the radio paging control center via the public telephone network, the device recognizes the digital signal represented by the signal, and then hands the digital signal to the automatic paging processor, which is encoded into The code is handed over to the radio paging base station for broadcast transmission.
The code of the control command indicates that the radio paging system of our country adopts the code as the standard code, and thus the control command of the public street lamp remote control system based on the radio paging system will appear in the form of a code on the channel.
The format of the code is as shown.
It adopts the synchronous transmission format and consists of a preamble and a batch or batch of code groups. Each batch of code groups contains one synchronization codeword and frame (two codewords are one frame of data).
Each codeword contains 32 binary bits (the bits are composed of coded plus parity bits).
The codeword is divided into a sync codeword address codeword information codeword and an idle codeword.
The address codeword contains the address information.
In the standard, the address of the pager can be represented by a decimal digit.
If expressed as binary, it is Z1. The upper 18 bits of the address bit are indicated in the address codeword of the code, and the lower three bits are implicitly framed.
The address codeword and the information codeword are distinguished by the first bit, that is, the first bit represents the information codeword and represents the address codeword.
The radio pager uses the received address codeword to confirm the information codeword belonging to itself.
In this system scenario, all street lights will have the same radio paging address code.
The identification of each street light is distinguished by the address in the address field in the control command.
The entire control command word will be embedded in the information code word (see figure, when the central station sends a command, all remote control devices on the street light will receive the information code word transmitted in the form.
After the central processor extracts the control command word, the control command word is analyzed and processed.
The first batch of the first batch of the first batch of the frame, the first batch of frames, the function of the position of the school, the position of the address, the address code, the code, the message, the bit, the parity, the area code, the group number, the number, the password, the password, the check digit, the code, and the command control word command. The format of the control word is as shown.
It consists of the area code group number street light number password command field and check digit.
The area code group number and street light number are used to identify the target object of the command.
In order to facilitate group control of the central station, the group number is reserved as a special group number.
When the group number is in the command, it means that the command is valid for all the street lights in the area.
Similarly, the light number is reserved as a special light number. When the light number is in the command, it means that the command is valid for all street lights in the group.
The command has three street lights to turn on and off the brightness of the street light and reprogram the parameters of the street light.
The remote terminal can change the area code group number and street light number of each street light through the parameter reprogramming command, and can change the password.
The check digits are used to verify the correctness of the command.
Remote Control Terminal Design Radio Paging Common Receive Control Illuminator Chess Light Diagram Receive System Block Diagram The system block diagram of the remote control terminal is given.
It can be seen from the first phase of the Radio Engineering Volume that the remote control terminal is composed of a radio paging receiver command processing module and a control execution module.
The radio paging receiver here is the same as the usual pager.
It completes the pager address matching comparison work and the decoding work.
The information bits contained in the translated information code words in the decoded two codes are transmitted to the command processing unit.
The information bits are processed by the central processing unit, and the address of the command is recognized to identify the type of the command and the corresponding control command is generated according to the command, and the command execution module completes the corresponding function.
The central processing unit is equipped with an electrical erasable to store important system parameters, such as the address code of each remote control module of the system access password, including the area code group number and number.
The control module executes the issued command and consists of a set of relays.
The processing flow of the central processing unit is shown in the figure.
First, the radio pager receives the command sent by the central station, decodes the command into a format, and hands it over to the central processing unit for processing.
It also receives control commands from local infrared remote control devices.
This ensures that in the special case, the local street light can be controlled by the infrared remote control device.
After receiving the command frame, the address matching process is first performed.
All street lights that are controlled are grouped into zones and groups.
Each street light has its own area code group number and its own number.
Such an addressing scheme enables simultaneous control of all street lights in a zone or a group, or control of individual street lights.
In the processing of the command frame, first extract the area code in the command frame, and compare whether it matches the area code to which the local light belongs.
If it does not match, it means that the command is not issued to the local area, and the processing is quit.
If the area codes match, the group numbers in the command frame are extracted for matching.
If the group numbers do not match, there may be two cases. One is that the group number is because there is no group number when the group number, and the special group number has its special meaning, which means that the order is valid for all groups in the area. .
This is the case where the central station performs so-called group control. In another case, the group number does not match, and it does not mean that the command belongs to other groups in the area, and the processing is withdrawn.
After the group number is matched, the control command light number is matched.
The same principle, if the light in the command frame is , the command is valid for all street lights in the group.
If the lights do not match and are not, then the command belongs to other street lights in the group and exit processing.
If the area code group number and the light number match the street light, the command is sent to the local light by the central station.
Then proceed to further processing.
First, password detection is performed on the command frame.
The password in the extraction command frame is compared with the password pre-stored in M. If it does not match, the exit processing if it matches, the radio pager that starts the analysis command does not receive the transmitted command infrared local remote command to enter the analysis command. The type generates corresponding control signals to be provided to the control execution module, and the processing flow of the umbrella factory is exhausted, and corresponding control signals are generated according to different commands to be provided to the control execution module for processing, such as turning on and off the brightness of the street lamp. Adjustments and other operations.
For the group control command, the password matching process is also performed first to ensure that no misoperation occurs.
After the password matching process ends, the type of the analysis command is different from the execution of the single street light command. For the command of the group control, the delay of 10 minutes will be performed according to the number of the street lamp before the command execution. .
The purpose of this is to prevent the surge current caused by a large number of street lights turning on and off at the same time to protect the power supply equipment.
By delaying the time when the lights are turned on and off, the current and voltage are smoothly increased and decreased.
In order to increase the flexibility of the central station for the control of the various lights, the central station also provides a remote renumbering of the street lights.
When the remote control terminal confirms that the received command is a reprogrammed command, it will go down to page 37). The color of the image can be processed to be bright and clear, and has a printing function.
Matrix settings.
The input image of the input can be displayed on the set monitor display by switching settings, and the length of the switching interval can be adjusted.
Control the sending of commands.
The terminal keyboard can be used to control the rotary table electric lens power supply infrared lamp defogger and wiper switch of each monitoring point. ) Video recorder remote control.
The video recorder remote control is used to control the surveillance video recorder, so that the user can perform video recording on the screen to perform functions such as fast-forward pause and stop, and provide reservation and alarm monitoring video.
Device power settings.
Determine the power switch status of each device, and save all the settings.
Alarm settings.
Ten groups of alarm modes are available for definition, allowing users to make alarms for different time situations.
In the event of an alarm, the alarm location will continuously sound an alarm.
At this time, it is released by the alarm reset.
Once an alarm occurs.
The system will automatically display the plan location number of the location, etc., and store the alarm information in the database file for future reference.
At the same time, the recorder is automatically started and an abnormal image is recorded.
(7) Display the save status.
Provides job status information saved by the operator.
8) Status reset.
Eliminate saved work status information.
Implementation of the communication protocol Because the system adopts a multi-level computer structure, it is necessary to exchange data between the computers at various levels. The system has established corresponding communication procedures for this purpose. The protocol complies with the open system interconnection reference model and has good Openness.
The procedure stipulates that the communication is performed in the primary/secondary mode. There is only one host in the network, and any data exchange is initiated by the host. The data information mainly includes commands and message codes, which are respectively sent by the host and the auxiliary machine.
The host uses controls to complete the application communication interface.
In addition, in order to ensure the accuracy of the signal transmission in the long-distance transmission system, a serial communication interface 85 is used to communicate with the lower computer.
Conclusion The closed-circuit television monitoring system uses image analysis and processing techniques such as differential image analysis and edge detection to realize the video alarm function. It has been proved by research and experiment that it has the following advantages: no need to add additional hardware equipment, saving a certain expenditure. A variety of image analysis and processing techniques, and can add or change other recognition algorithms according to actual needs, improve the security and flexibility of the alarm system, and have good practical value.
Xu Jianhua.
Image processing and analysis.
Science Press, Tian Jie, Sha Fei, Zhang Yusheng.
Practical image analysis and processing techniques.
Electronic Industry Press, the writing of the stone of the sound of the sound of the seventy-two 5 complete heart, the color of the nest, the month of July, July and July, the name of the second, the death of the second place, the death of the second place, the 忿 廿 廿 忿 忿 : : :: 2nd 2nd, 2nd, 2nd, 2nd, 2nd, 2nd, 2nd, 2nd, 2nd, 2nd, 2nd, 2nd, 2nd, 2nd, 2nd, 2nd, 2nd, 2nd, 2nd, 2nd, 2nd, 2nd, 2nd, 2nd, 2nd, 2nd, 2nd, 2nd, 2nd, 2nd The new area code group number and the street light number and password in the received command frame are stored in the original corresponding parameters.
In this way, each street light can be arbitrarily grouped, so that the central station can be conveniently and flexibly group controlled.
Conclusion It can be seen from the above discussion that through the radio paging system broadcast command, the central control station can not only control the street lights individually or in groups, but also remotely change the number and password of each street light, and different street lights. Into a variety of different groups.
Therefore, by using wireless paging, a wireless communication tool with wide coverage and low cost, flexible and effective remote control of the public street lighting system can be realized.
Fa Bingxia, Li Xiaobai.
Radio paging system.
Beijing Electronic Industry Press, the side of the murderer, a state of sleep, a state, sleep, a state, a boring, a month, a 10th issue in a soul, October, in the eleventh issue, published in January, the state of the month, the month of the month, the month of the month The month of October, the eleventh month, the month of October, the month of October, the month of October, the month of the month, the end of the month, the end of the month, the work of the October, the month of October, the month of the month, the month of the month, the month of the month, the month of the month, the month of the month Journal of the exam, October 10, "St. St. Gezi" page) References] Qi Yuan, Wang Weiming.
The interface between the MCU and the serial series is not available.
Electronic technology, Zhang Youde, Philips Lilai column microcontroller principle and application manual, Beijing University of Aeronautics and Astronautics Press, Gang Hanbing, Qi Qiuqun.
The principle and application of the powerful single-chip microcomputer.
Beijing Institute of Technology Press,
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