GF82.85-P-3008RMU Data Transfer Between COMAND and Instrument Cluster Function

GF82.85-P-3008RMU Data Transfer Between COMAND And Instrument Cluster Function

With the aid of the multifunction steering wheel (MFL) buttons and the left multifunction display (A1p13) of the instrument cluster (A1), the following systems controlled by the COMAND operating, display and control unit (A40/3) can be operated and information on the systems displayed:
^ Audio systems (e.g. radio, CD changer, etc.)
^ Navigation system
^ Telephone system

The entire data exchange between the instrument cluster (A1) and the COMAND operating, display and control unit (A40/3) takes place via the controller area network bus class B (interior) (CAN-B) and Media Oriented System Transport (MOST). The audio gateway control unit (N93/1) acts as the interface between CAN-B and MOST.

All buttons actuations on the multifunction steering wheel (MFL) are read in by the instrument cluster (A1) directly and voltage-coded. The instrument cluster (A1) links these signals with the system (audio, navigation, telephone) currently displayed on the left multifunction display (A1p13). This interpretation is necessary because the function of the buttons depends on the current content of the left multifunction display (A1p13). The interpreted data are subsequently placed onto the CAN-B by the instrument cluster (A1) and received by the COMAND operating, display and control unit (A40/3) via the MOST.
Changing the system on the left multifunction display (A1p13) does not affect the display on the screen of the COMAND operating, display and control unit (A40/3); however, changing the display on the screen of the COMAND operating, display and control unit (A40/3) does affect the left multifunction display (A1p13).

The instrument cluster (A1) receives the current time from the COMAND operating, display and control unit (A40/3) since this information is automatically received via global positioning system (GPS).