The Remote Monitor And Control System Of Elevator Equipment Based On The Switched Telephone Network

This text describes a suit of design project of a remote monitor and control of elevator equipment based on shanghai certain elevator equipment company. The system takes AT89C52 and AT89C51 as double CPU 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 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, RS-485 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. Firstly, the principle of ITU-T V.23 is introduced. This part taking MSM7512B as core explains the communication course. This is kernel and soul in all the text. Secondly, the realization of RS-485 network's software is given.The third part introduces a arithmetic which can improve stability and economize cost. This system takes CRC arithmetic. It is different from others CRC. It is a shortcut and delight arithmetic by checking tables.The Last part of the thesis summarizes the design plan of this system. The system get across practice test, prospect is pointed out.