C 320 CL (203.764) V6-3.2L (112.946) (2004)
Component Identification
Integrated into the COMAND operating, display and control unit (A40/3) are:
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Graphical LCD color display
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Navigation processor with GPS receiver and gyrosensor
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CD drive for alternately playing Audio CDs and loading navigation data
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Traffic data memory
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2-tuner radio
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Audio amplifier
The COMAND, operating, display and control unit (A40/3) features the following digital interfaces:
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Controller Area Network bus class B (interior compartment) ( CAN B)
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Digital databus (D2B)
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Diagnosis interface
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Robert Bosch CAN (RB CAN)
GF82.85-P-3114-08P Operating, Display Unit With Control Unit, Function
GF82.85-P-3114-08P Operating, Display Unit With Control Unit, Function
- with CODE (352a) COMAND operating and display system
- except CODE (491) U.S. version
- except CODE (498) Japanese version
Processing button actuations
The control buttons and switches on the function keypad on the COMAND operating, display and control unit (A40/3) are read in via the microcontroller
I/O ports and transferred to the central processor. Depending on the system function, the button presses are processed in the central computer or notified
over the Digital Data Bus (D2B), Controller Area Network bus Class B (interior) (CAN-B) or Robert Bosch CAN (RB CAN) in the form of a data
telegram to the other system components.
Graphic editing and image output
The video subsystem takes over editing and output of the control displays. The operating masks are internally output to the display by the graphics
subsystem via the RGB signal output (R=red, G=green, B=blue).
The information and amplitudes of the 3 primary colors red, green and blue as well as a synchronization signal are included in the RGB signal.
The electronic circuitry in the display unit evaluates the RGB signal and controls the individual display dots line by line in terms of color and intensity.
A horizontal synchronization pulse occurs at the end of each line. The electronic circuitry of the display unit then starts the next line. Upon reaching the
last line the vertical synchronization pulse is received causing the electronic circuitry to start the first line again.
Audio signal output
The audio signals from the various sources (e.g. Compact Disc (CD), navigation voice output) are prepared by the COMAND operating, display and