Abstract

An embedded real-time system prototype for remote surveillance and control is presented. The system consists of an embedded single-board and a few simulators for devices of which status is monitored and behavior is controlled. These components are connected through a fast switch via which the status information of devices is sent to the single-board computer periodically. And then the single-board computer will publish the status information to Internet or Intranet through an embedded web server called GoAhead. The operators can browse the status of devices and issue device control command via any standard browser (e.g. IE or Netscape) without additional client side software installation bother. To guarantee the timely data collection of the single-board computer, RTLinux was employed. But considering RTLinux cannot access network on the RT side, we employed the RTNET, which implemented a IP stack on RT side. The data is collected by a real-time task and then fed to a user space process via FIFO and share memory. The application code for client side was a JAVA applet and would be downloaded upon the operator¡¯s browse request. The applet runs on the client side and provides the graphical presentation of data and the operating interface for operator. This prototype system will have broad application scenarios, such as Device Remote Surveillance system especially the remote monitoring of device that located in the distant mountain and hazardous scenario.

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