Interface has resistive network between first input/output and first output whose dimensions are such that a mains voltage or a low voltage can be applied to input to drive control circuit

摘要

The interface has at least a first input/output (TXD) and at least a first output (TA) to which a first control circuit that is driven by a low voltage can be connected and a resistive network (R1-R7) in the interface between the first input/output and the first output. The dimensions of the resistive network are such that a mains voltage or a low voltage can be applied to the input to drive the first control circuit.