The Development And Design Of The Wireless Control System Based On GSM Short Message Service

With the development of the global mobile communication, the number of GSM mobile telephone is also increased quickly; the competition for services among many telecommunication companies is very fierce. It is more and more important that the development and application of new technology and new service. Many GSM network manage companies have high regard for how to make use of the resource and the covering of GSM network, a large amount of users to develop value-added service. GSM modem combines the advantages of all-on-line, no dial, cheap, covering far going. It is perfect applicable on transport little data flow continually, such as vehicles attempter, security, navigation, monitor.Computer units including PC and single chip connected through serial interface were applied widely in industry control, condition measure. These systems almost communicate through RS232, RS485 or Modem. These manners limit deeply situation of the units' application though these economy and practicality.In order to solute these disadvantages, we find that we can apply the GSM common network to transport data. That is, we use GSM modem that can support short message service to transport alarm information connecting with the single chip system through standard RS232 interface. We can make the data transported wireless, and the monitor terminal is not only PC, but also mobile telephone or other mobile terminals.This paper introduces the concept and structure of GSM short message services; the functions of wireless monitor system, the hardware design of the data collection terminal, the design and program of the software.The first part of the paper describes the character and the business application of the short message service, analyses completely the transporting theory of SMS based on GSM network, emphasizes the code scheme of protocol description unit and the AT command application on control the SMS receiving and sending.The second part of the paper describes emphatically the capability and the debugging of the Wavecom modem, and function design of the wireless monitor system. Then, decides the scheme image of interface, defines the function module of the system.The third part of the paper introduces the design of the single chip's electrocircuit according to the function of the wireless monitor system and the data collection terminal. The Siemens mobile telephone with the GSM modem is controlled by the AT command through the mobile telephone data line between the signal chip system and the serial interface of the mobile telephone.The forth part of the paper describes the design of the software flow frame function according to the function of the wireless monitor system. The program was designed by C51 and Visual Basic language. Re/mark the function of the program, input, output, and relation among them. Imitate the program function through Franklin C51 software. And debug the hardware function through SuperICES-G6E. These test are all do well as we designed.We can use the messages exchanged between an external application module and the WAVECOM GSM mobile station, based on AT commands to transport data in many field areas, such as mobile vehicle monitor system, lab monitor, remote maintenance system, mobile data query, data collection system, mobile POS machine, mobile charge system, mobile 1C card telephone, fixation wireless input application, mobile data and Internet input.The wireless remote controller composed of GSM short message makers the control of remote facilities has come true. This paper makes brief introduction to the principle and operation of GSM remote supervisory control. We can make use of this system at computers room, library, office in order to guard against theft and alarm, so that remote supervisory control don't need anyone. As the industry GSM module, our research its useless method and the development on mobile telecommunication added-value service will make progress on this subject.