Interface for coupling a bus node to the bus line of a bus system

摘要

The invention relates to an interface (2) for coupling a bus node (6) to the bus line of a bus system (4). According to the invention, the inventive interface comprises an input (10) for an external supply voltage (Vext) which is provided by a bus-independent voltage source (8), and comprises a monitoring circuit (30). Said monitoring circuit is provided for comparing an internal supply voltage (Vcc) derived from the bus voltage with the external supply voltage (Vext) and for generating an output control signal (R) for the bus node (6) based on the result of the comparison.