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

GF82.85-P-0003RJ Cockpit Management And Data System (COMAND), Function
- with CODE (498) Japan version

Component Identification:

The COMAND operating, display and controller unit (A40/3) can be used to operate the following systems centrally:
^ Integrated radio tuner
^ Integrated digital versatile disk (DVD) drive for playing navigation DVDs and audio CDs
^ Navigation system with dynamic destination-oriented navigation system
^ Sound system (model 230.467 with code (810) Sound system)
^ CD player with changer (A2/6)
^ Personal Digital Cellular (PDC) mobile telephone system
^ Voice control system (VCS [SBS])

The "Audio-AUX" function enables additional audio sources such as, e.g. an MP3 player to be integrated into the front entertainment system. An AUX jack is located in the glove

The COMAND operating, display and controller unit (A40/3) is the central component of the COMAND system. It has a color liquid crystal display (LCD) with video capability for displaying information such as operating menus and map data for navigation. It is operated by means of preset function keys and 2 rotary switches as well as menu-assisted on the display. Some functions can also be activated with the aid of the push-buttons on the multifunction steering wheel (MFL). Here one should note that all button actuations on the multifunction steering wheel are initially processed by the instrument cluster (A1). The instrument cluster (A1) combines the incoming button actuations with the current menu setting on the left multifunction display (A1p13) and, if necessary it sends an appropriate Controller Area Network (data bus/CAN bus) (CAN) message to the COMAND operating, display and controller unit (A40/3).

COMAND data bus system
The digital components in the COMAND operating, display and controller unit (A40/3) are interlinked through a data bus system. The databus system is used to transmit data (control commands and useful information) between the various system components. The individual component operate with various data formats and they have different request in terms of transmission rate and reliability. Therefore, the following different data bus systems are installed:
^ Digital data bus (D2B)
Data is exchanged via D2B between the various D2B components. In doing so both control data and audio signals are transmitted.

^ Controller area network bus class B (interior compartment) (CAN B)
The CAN-B is used for data exchange with the instrument cluster (A1). This is how the instrument cluster (A1) receives the audio, telephone and navigation data and the time via this data bus from the COMAND operating, display and controller unit (A40/3) for the left multifunction display (A1p13).