Design Of Embedded Integrated Remote Monitoring Instrument

With the constant development of embedded technology and network technology, the monitoring method by connecting embedded monitoring device to the Internet gradually takes the place of the traditional method. The paper designs the overall structure of the embedded remote monitoring system, and develops its key instrument that is the integrated embedded remote monitoring instrument.In the hardware design, the instrument applies micro-processor chip AT91RM9200 with ARM9 core as the processor of the embedded monitoring server. In order to realize the Internet connecting,the instrument also extends the network interface circuit based on the EtherNet control chip DM9161. In the software design, the instrument adopts the embedded real-time operation system Linux to carry out effective task-schedule and task-management. The embedded CAN-EtherNet gateway is built, which can realize a seamless link between the field-bus and Industrial Ethernet by porting the EtherNet/IP protocol. BOA is ported to set up a web server. Applying the embedded database SQLite, the instrument can manage the mass of data effectively. Based on the software foundation, by applying CGI (Common Gateway Interface) and adopting the multithread, the instrument realizes the embedded web monitoring software in B/S mode. In addition, applying the Flash technology and UDP Socket transmission, the instrument develops the Flash monitoring application in C/S mode due to the fact that the C/S mode has the advantage of good interaction and high translation speed, which can make up the shortage of the B/S mode.This paper has following features: The remote monitoring instrument, which can support remote monitoring service independently, integrates the gateway,web server and database, and it has the advantage of small size, low cost and convenience. It uses advanced industrial Ethernet topology, downward compatibility with fieldbus technology, can be accessed seamless upward to office Ethernet. It applies the Flash technology to solve the problem of webpage flickering on the screen.