Design And Implementation Of Low Cost Web Remote Monitoring Network

With the development of the city, improvements of different kinds of service facilities and the enhancement of people's life quality, remote monitoring technology gradually infiltrated into the areas of electrical power, communications, traffic, security, ecological monitoring, etc. The large-scale applications of remote monitoring put forward new requirements to the remote monitoring network.By comparing the advantages and disadvantages of various monitoring networks, Web remote monitoring system based on MCU was proposed in order to alleviate the contradiction between cost and system function. B/S structure was adopted and the proposed system consisted of a user terminal, a system management server and a monitoring node. Systems management server based on PC platform had the functions of user authentication, redirection of node, network management, database support, software download on client, etc. Monitoring node based on SCM had the functions of data sampling, processing, distribution and control, which consisted of a Web server, a monitoring module and a peripheral circuit.Network realization of web server in monitoring node was the realization key. Aiming at embedded real-time operating system u C/OS-II and no operating system respectively, the web server was realized. The main work is as follows:1. the appropriate TCP/IP technology was adopted to realize webpage in the absence of file system support; 2. the concept of virtual CGI was put forward to build dynamic interaction between client and server; 3. AJAX technology and ActiveX control were combined to enhance dynamic display performances of user interfaces without increasing the burden of the server. The method without operating system was favorable for further reducing the cost of the system, and the method with operating system can be applied to the system with complex tasks.Considering the consistency between remote experiment and remote monitoring technology, heating furnace temperature remote control system was studied, which adopted web remote laboratory as a platform. The experimental results showed that the embedded remote experiment system can get the same effects as the systmens based on PC, so the proposed web monitoring network's feasibility was tested.