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How does automotive multiplex systems work? Each of the systems (ABS, Engine, Airbag ect) has a control unit. Each of these control units has a transmitter and a receiver to "talk" to the other units. The units are "ranked" according to safety or the systems that they control. As an example, this is how the system would operate. The ABS system receives a message fom the wheel sensors to say that the wheels have locked. The ABS unit sends a message to the engine unit to reduce throttle angle (acceleration). At this point, the ABS unit has priority to send messages. The vehicle fails to stop and crashes. At this point the airbag (SRS) unit sends out a crash signal. Now, the SRS unit has priority, as it is safety crittical.

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