Client-server and gateway-system for remote control

With the rapid development of the Internet in recent years in conjunction with the TCP/IP transmission protocol and the latest version of the hypertext (HTML) facilities, new possibilities have come into existence for the use of the network for remote control of experiments in research labs and other practical systems. Using graphical software languages client-server systems can be easily designed. Client-server systems have some general advantages when compared with remote-access systems (RAS) or proprietary (single-solution) systems. The disadvantage of http-based client-systems is the need for a minimum stable transmission rate of 7 kbyte/second. Router, hub and switcher technologies reduce the effective transmission rate of high speed Internet connections. In recent years gateway systems for remote control have become available for most measurement and instrumentation bus systems and this effectively allows direct access via LAN/Internet with a minimum of transfer data-rates needed for control.