In several applications for automation, radio transmission could be a good alternative to wired field busses 181. The advantages are an easy, fast and low cost installation scenario in common with the possibility of flexible device placing. But, the specifics of radio require a very specialized protocol stack which effects the whole system architecture. Starting from the requirements of building automation, the paper shows a concept of an architecture for the integration of wireless devices in wired field busses. It is shown that radio transmission is well suited for open loop sensors and user terminals. But for actuators and backbones, it is a better choice to keep them on wires.
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