Design On Communications Module Of Classroom Intelligent Control System

In order to construct low-priced, reliable classroom intelligent control system, to meet the demands of information collection, transmission, query and control, to achieve to survey and control electro-equipments of classrooms, I studied the fieldbus technology and communication protocols of Modbus and CAN. Base on our country condition of classroom intelligent system and development tendency in the future,I made a suggestion on technical precept of CAN+RS485 double deck bottom network, to design an intelligent network model of classroom intelligent control system.This model of distributing system is based on fieldbus technology and makes a network of CAN+RS485. The CAN network is composed of Main controller which has bus interfaces and middle controller. The lower layer of RS485 network is composed of lower position machine and middle controller which has RS485 interfaces, to realize the network module of classroom intelligent system.This dissertation serves as an introduction to design and implementation of intelligent network model. This dissertation is composed of intelligent classrooms, fieldbus technology, CAN+RS485 technology, hardware and software.