Communication bus system and apparatus and device for use in such a system

摘要

A station in a communication bus system is connected to a signal transmission line. The station contains a wave splitter coupled to the transmission line and a transmission section coupled to an input of the wave splitter for transmitting an outgoing wave signal to travel out over the transmission line from the wave splitter. The station contains a reception section coupled to an output of the wave splitter for receiving an incoming wave signal that travels into the wave splitter from the connector. The station has a control unit being arranged to operate in different control modes, according to the presence or absence of a further apparatus connected to the transmission line, dependent on whether the reception section does not detect or does detect a reflection of a wave transmitted by the transmission section, respectively.