GF82.85-P-0003QMU Cockpit Management and Data System (COMAND), Function

GF82.85-P-0003QMU Cockpit Management And Data System (COMAND), Function
- with CODE (530) COMAND APS USA (with navigation system)

Component Identification:

Function
The COMAND operating, display and controller unit (A40/3) is the central Cockpit Management and Data Systems (COMAND) component. Operation takes place using preset function keys and 2 rotary switches as well as menu-assisted on the display. Some functions can also be activated using the left multifunction steering wheel button group (S110) and the right multifunction steering wheel button group (S111). It should be remembered in this cas that all operations are first processed by the instrument cluster (A1). The instrument cluster (A1) links the incoming requests with the current menu setting in the multifunction display (A1p13) and, where applicable, it then transmits a message to the COMAND operating, display and controller unit (A40/3). The vehicle can optionally be designed with the following equipment variants:
^ Voice control system (VCS [SBS]) (with code (813) Voice control system (VCS [SBS]))
^ Digital radio (with code (536) SIRIUS satellite radio)

Since modification year 07/1 the SDAR control unit (N87/5) (3rd generation) has been used, which is now also available for vehicles with code (460) Additional parts, Canadian vehicles. The SDAR control unit (N87/5) (3rd generation) differs from previous generations through the following features:
^ Shorter response times
^ Improved reception properties
^ Temperature and electromagnetic compatibility (EMC) properties have been optimized

Data bus systems
The digital components in COMAND are linked to each other. The data bus system is used to transmit data (control commands and useful information) between the various components. The individual component operate with various data formats and they have different request in terms of transmission rate and reliability.
Therefore, the following data bus systems are installed:
^ Controller Area Network bus class B (interior) (CAN-B):
The instrument cluster (A1) receives the audio, telephone and navigation data from the COMAND operating, display and controller unit (A40/3) for the multifunction display (A1p13) in the instrument cluster (A1) as well as the time.

^ Media Oriented System Transport (MOST):
Data are exchanged between the sound amplifier (A2/13), the CD player with changer (in glove box) (A2/6), the telephone system and, where applicable, the voice control system (VCS [SBS]). Both control data as well as the actual audio signals are transmitted.

Additional audio sources (e.g. MP3 player, Walkman) can be connected using the "Audio-AUX" function. For this purpose, an external "AUX" socket is located in the glove compartment as a connection option.