CD Changer, Supply

CD Changer (CDC)

The CD changer is a control module in the MOST network. Up to 6 CDs can be inserted in the removable cassette. At temperatures above 70 degree C the ASK shuts down. The MOST functions are then no longer available.

Operating unit

Eject button
The Eject button is used to eject the sound carrier. The function is not dependent on the status of the control module. If the control display indicates a sound carrier in the ASK which cannot be ejected however, the device is mechanically faulty.

MOST bus
The MOST (Media Oriented Systems Transport) bus links the audio, video and navigation systems. Information relating to function requests is transmitted to the relevant control modules by means of MOST bus messages. If a control module does not accept a message intended for it, the procedure is repeated by the transmitting control module up to five times. Nevertheless, if a receiving control module does not accept the message, the action is not started.

Operation







Function
Turning the combined rotary control/push button on the audio system controller adjusts the volume of the current audio source. If a rotary movement is performed, the ASK transmits a status change to the control display. The control display identifies the currently active audio source and sends a telegram containing the level of the volume to be adjusted and the active source to the ASK. If the appropriate equipment is fitted, the telegram is also sent to the Top Hi-Fi amplifier. These components control the volume at the speakers accordingly.

The "Volume adjustment" function can also be executed at the multifunction steering wheel (MFL). The MFL transmits a status change via the CAN to the control display. The control display processes the status message and sends a telegram containing the new volume value and the current source to the ASK or to the Top Hi-Fi amplifier. Thus, in the event of a malfunction, the location of the fault can be narrowed down to two control modules.

Search function with ASK
When the auto search button is pressed, the ASK transmits a status change to the control display. The control display identifies the currently active audio source and sends a telegram containing the request to the relevant control module. The functions can be: next track (drives), next station/channel (TV, radio).

Search function with MFL
When the auto search button is pressed, the MFL transmits a status change to the control display. The control display identifies the currently active audio source and sends a telegram containing the request to the relevant control module. The functions can be: next track (drives), next station/channel (TV, radio).