Data transmission system for electrohydraulic mine supports - has control units with barriers for selective blocking unit transmit operation

摘要

Several electronic controls, each with a microcomputer controlled transceiver, are interconnected by a data bus in the transmission system for the mine support control. The controls (Stl...Stn) contain barriers, which prevent the operation of the remaining controls, when the input data bus (1) wire is engaged by one control transmission. Pref. the controls are fitted with measuring members for the electric potential of the single wire data bus. The data bus may be coupled to a reference voltage across a pull-up resistor (4). The controls may each have a switch (S) for applying a reference potential (3) to the data bus at the start of the transmission by one control. ADVANTAGE - Economical wiring even for numerous controls.