ABSTRACT
The paper makes an effort and finally implemented the concept that using the in existence Internet to monitor and control the remote filed object with the help of embedded terminal. Through reasoning of the network structure, developing of the software and hardware on platform level as well as the application level of the terminal, we provide a approach for the wish of monitoring and controlling filed objects at any time in any where.
As far as the network structure been concerned, basing on the analyzing of data transmission mode as well as static and dynamic web refresh technology, with the method of combining B/S and C/S mode, using browser side dynamic web refresh technology Java Applet and the embedded web server technology, HTTP based and Socket based two communication channels have been established between the client side browser and terminal server side. So that the dynamic interaction was implement- ed by dividual transmition of the web page and the monitoring controlling data.
As far as the terminal been concerned, feeding the needs of basic Internet access ability as well as the basic monitoring and controlling ability, giving attention to the cooperation of software and hardware, we come up with an ARM-Linux based structure conception for construct an universal application platform.
In aspect of hardware, a highly integrated ARM720T core based MPU been used as the main controller extended with an ethernet controller besides the mini-periphery system so as to integrating the networking monitoring and controlling altogether.
In aspect of software, the Linux kernel been used as the system underlay equipped with ARMboot and the file system to form a whole software platform. In needs of applications, on the bottom layer, device drivers including I/O mode and A/D mode was developed, while on the top layer a thttpd based HTTP server was integrated as well as the Socket API based communication program between client side browser and terminal server side. Finally a KVM based implementation was discussed.
Validated by the demonstration,the system finally implemented the feed back of filed monitoring data,the controlling through the WBUI and the on line configration.
The system provided an positively feasible solution for domestically developing of the independent and source open remote controlling and monitoring terminal.
Key words： remote controlling and monitoring, embedded web server, ARM-Linux,
Socket, WBUI, Internet
