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Abstract

A method and arrangement for combined data- and power distribution between nodes (MA, SL, SL.sub.N) in distributed data processing systems having a common communication bus (1, CAN.sub.H /CAN.sub.L) in which the communication bus includes at least one wire or differentiated dual wires transmitting digital information serially in form of dominant data bits at a first signal level (U.sub.1 /U.sub.3 V/.sub.D2) and recessive data bits at a second lower signal level (U.sub.2, V.sub.D1) in a sequential order dependent on the content of the data being transmitted. Nodes (SL) having a low power consumption obtain power supply through dominant bits being transmitted on the bus (1), which dominant bits charge a capacitance (15) in the low effect nodes (SL). Nodes (MA) having a higher power consumption obtain power supply from a voltage source (V.sub.1) separated from the bus. At least one node (MA) of the high effect nodes includes an amplification unit (20-24) which will be activated automatically in order to amplify the potential of dominant bits being transmitted by a low effect node.

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