The Remote Monitor And Control System Based On The Wireless Technology And Public Switched Telephone Network

This text describes a designed project of remote monitor and control system. The system take W77E58 and AT89C51 to collect data and feedback control. Uses MSM7512B of Japan OKI company connect with standard Modem. Adopts international standard protocol ITU-T V.23 to communicate. Utilizes PSTN by way of transmit channel. Central manage computer takes charge of administer data. The locale use the RF401 wireless communicate module which produced by NORDIC to collect data and feedback control. The remote monitor and control system can watch, telephone and register elevator status. It will put in practice urgent measure in crisis. By means of bottom exploder of Micro-controller, it both assures the quality of running and reduces the cost, increase the economical benefit.The first part of the thesis describes the design and realizes scheme of the scheme of the systematic hardware. It concludes telephone network communication module, RF wireless module, data gather module, man-machine interface module, Telephone network communication. It concludes answer circuit, ring circuit, modem circuit. Others module's realization will be refer too.Second part introduces systematic software design in detail. Design the locale wireless communicated principle. Introduced the principle of ITU-T V.23. This part taking nRF401 and MSM7512B as core explains the communication course. They are kernel and soul in all the text. Secondly, the text also introduce the MSCOMM of VB, which is used in the PC control.The third part introduce the RF wireless communicated theory. Included the modulation and demodulation of the wireless system, the theory of PLL and DSS.The Last part of the thesis summarizes the design plan of this system. The system get across practice test, prospect is pointed out.