REAL TIME CONROL AND MONITORING OVER THE INTERNET

摘要

It is very useful for wide range of applications to have the ability to remotely access and monitor an environment, and control the operation of targeted equipment, facilities or integrated processes. It is also vital for hazard environments, special skills, and special equipment to be accessed, manipulated and utilized efficiently independent on space and time. The Internet technology makes such tasks and applications possible due to its cost effectiveness, ubiquity, platform independence, and its media rich interface. But, having real time data while controlling a remote environment with single/integrated processes or simple/complicated devices through the Internet is not that straight and simple, because data transmission through the Internet is often irregular and unreliable due to unpredictable time delay and possible data loss. This paper addresses the technical issues and requirements that affect the design and performance of Internet based real time control and monitoring systems. Such issues include Quality of Service (QoS) and the effect of bandwidth, time delay/latency, controllability and reliability, user interface, security, and control mechanism in relation to interactivity and operational safety. Proposals to reduce the impact of the issues that limit the performance of the real time control systems over the Internet are presented and examples are illustrated.