Realization Of Intelligent Home System Based On RS485 Bus

Network technology and the development of digital information have provided strong technical support for realization of intelligent home. The development of sensor technology offers technical foundation for the exchange of information between family equipment and network. While the development of computer technology, large-scale IC and embedded technology realize monitoring, control and management of equipment access to home network. On the basis of above, this issue proposes a low-cost, low-power home system solution.The intelligent home system solution basing on RS485 bus raised by this thesis includes three parts: terminal access module, relay and home gateway. Single chip serves as control core of access module. For the first time, this paper proposes concept of universal access module which used to integrate various sensors and switches into home network. Relay forms inter-family communication network with various access modules using RS485 bus. Home gateway and relay connect through internet in order to form internal home communication network. And this system interact information with outside through home gateway. To ensure data transmission without conflict between terminal access module and relay, this design proposes perfect communication protocol. At the same time focusing on characteristics of operating system for embedded system, this paper proposes functions of automatic updating and protection of software.This paper presents hardware circuit and software flow chart of each module, frame structure of communication protocol, and different measured scene to show complete life cycle detection of access modules and uplink and downlink data frame transmission functions.