Example Of CD Gateway Function: PDC
The audible PDC warning is output via the audio system speakers. If the car gets close to an obstacle when the PDC is active, this is signalled by the relevant sensor to the PDC control unit via the bi-directional data line. The PDC control unit calculates the distance from the obstacle and places that information on the K-CAN S.
The Control Display (CD) receives the message and passes it on in its role as "gateway control unit" to the MOST bus. The Audio System Controller (ASK) receives the message from the CD and calculates from it the required signal tone and frequency. On the basis of that calculation, the ASK activates the mid-range speaker in the appropriate corner of the vehicle. The audible signal is superimposed (mixed) over the current audio sound (radio, CD, etc.).