Cockpit Management and Data system (COMAND), function - GF82.85-P-0003R
MODELS 203.0 /2 /7 up to 23.4.04 with CODE (352a) COMAND operating and display system with CODE (491) U.S. version
Block diagram, overall system
Illustrated with following equipment:
- CD changer (code 819a)
- Voice control system (VCS) (code 813)
- AMPS-network portable CTEL telephone (D2B)
Cockpit management and data system (COMAND), function
The COMAND operating, display and control unit (A40/3) is the central component in the COMAND system. It has a video-capable Liquid Crystal Display (LCD) color display to output information such as operating menus and map data for navigation. It is operated by means of fixed function keys and two rotary controls as well as menu-guided in the display. Several functions can also be activated with the aid of the buttons on the multifunction steering wheel (MFL). It should be noted that all button operations on the multifunction steering wheel (MFL) are first processed by the instrument cluster (A1). The instrument cluster (A1) combines the incoming button signals with the current menu setting on the multifunction display (A1p13) and sends an appropriate Controller Area Network (databus/CAN bus) (CAN) message to the COMAND operating, display and control unit (A40/3) if necessary.
The vehicle can also be equipped optionally with an infrared remote control for issuing commands from the rear of the passenger compartment as well as a voice control system (VCS) (code 813) for telephone functions and several audio functions, both of which serve to further enhance operating convenience.
Bus system (COMAND)
The digital components in the COMAND operating, display and control unit (A40/3) are networked with each other through a bus system. The bus system is used to transmit data (control commands and useful information) between the various system components.
Because some of the individual components work with different data formats or require different data transfer rates and security levels, the following different bus systems have been installed:
- Controller area network bus class B (interior) (CAN-B)
- Digital databus (D2B)
The digital data bus (D2B) is used for data exchange between the sound amplifier (A2/13) (with code 810), the CD player with changer (in glove compartment) (A2/6) (with code 819a), the telephone system and, if installed, the voice control system (VCS) (with code 813). Both control data as well as the actual audio signals are transmitted.
The CAN-B is used for data exchange with the instrument cluster (A1). In this way, the instrument cluster (A1) receives, from the COMAND operating, display and control unit (A40/3), the audio, telephone and navigation data for the multifunction display (A1p13) in the instrument cluster (A1) as well as the time of day.
| Cockpit Management and Data System (COMAND), driver information | Displays in the instrument cluster | GF82.85-P-0003-03R | |
| Radio mode, function | GF82.60-P-2001R | ||
| CD-player mode, function | GF82.60-P-2002R | ||
| Volume/tone adjustments, function | GF82.60-P-2003R | ||
| Navigation mode, function | GF82.85-P-2012R | ||
| Starguide, function | GF82.85-P-2014A | ||
| Information service, function | GF82.85-P-3016A | ||
| Data transmission for Starguide, function | GF82.85-P-3017A | ||
| Switch on/off behavior, function | GF82.85-P-2006R | ||
| Telephone mode, function | GF82.85-P-2007R | ||
| Cassette mode, function | GF82.85-P-2010R | ||
| Data transfer between COMAND and instrument cluster, function | GF82.85-P-3008R |