• Registered: 2022-05-01
  • Posts: 2

Topic: MMI monochrome display protocol

Hi guys. I am trying to read the signal from/to the MMI monochrome display (Audi A6 C6). I am trying to read the UART signal on A82C250 (CAN Controller) chip but I am not sure how to read that one. Is there someone who has knowledge of how to read and how understand the protocol? The service manual could also be helpful. Thanks

  • From: Hessen / Germany
  • Registered: 2015-01-01
  • Posts: 2,135

Re: MMI monochrome display protocol

Hi, I have no experience with the monochrome displays. But I know that the 82C250 is actually only the CAN transceiver, not a real CAN controller. The RX and TX signals of that chip are not UART. They are CAN protocol, just split into transmit and receive direction.
In order to work with CAN bus, there are many (also cheap) options, like CAN shield for Arduino.

stefan@fis-control's Website

  • Registered: 2022-05-01
  • Posts: 2

Re: MMI monochrome display protocol

Thank you for your answer. It seems that is better to read the CAN signal than the UART output.