VERFAHREN ZUR AUF EINE VERSORGUNGSGLEICHSPANNUNG AUFGELAGERTEN SIGNALÜBERTRAGUNG IN EINEM BUSSYSTEM

摘要

In a bus system, voltage signals are transmitted from a central unit to modules connected to a bus line by selectively applying first and second voltage levels to the bus line. The modules reply thereto also by voltage signals superposed on a direct supply voltage on the bus line by selectively pulling the bus line to a third voltage level. For the time duration of the signal transmission by one of the modules, the central unit provides the direct supply voltage to the bus line through a resistor, so that the voltage signal of the module on the bus line can be detected in the central unit on the side of the resistor facing away from the source of the direct supply voltage. A preferred application is for bus systems in motor vehicles, especially for a sensor data bus.