Patent ID: 6133647
Filing Date: 2000-10-17
Classification: B60R,H04L

Abstract:
A circuit layout for a serial transmission and reception interface of a central unit from a vehicle occupant protection system, by means of which interface digital signals are exchanged with a communication module via a transmission line and a reception line, characterized in thatvia the same serial transmission and reception interface, an additional diagnosis module can be connected,in that the central unit features additional tristate outputs for four control signals,in that the reception line of the central unit is connected to a transmission output of the communication module via a first diode switch which can be activated by means of a first control signal, and in that the reception line of the central unit is connected to a transmission output of the diagnosis module via a second diode switch which can be activated by means of a second control signal, andin that the transmission line of the central unit is connected to a reception input of the communication module, via a first decoupling resistor, and to a reception input of the diagnosis module, via a second decoupling resistor, with a third control signal being applied from the transmission line, following the first decoupling resistor, and a fourth control signal being applied following the second decoupling resistor.