Jump to content

Connecting to Bosch DDU7 dash over CAN


Richard Luciano
 Share

Recommended Posts

I have a Link G4 extreme (serial 12xxx). I have a Bosch M4 motorsports ABS unit and Bosch DDU7 dash. I have connected the DDU7 and M4 with the Link G4 by the CAN bus connector. The DDU7 sees the data from the M4. But I have not been able to get ECU data to the DDU7.

 

Here is the Link configuration. It is the generic dash setup:

LinkCAN

I have confirmed that the DDU7 is communicating with the M4 ABS and the yaw sensor over CAN. They are communicating at 1 Mbps. 

Here is the DDU7 CAN input setup page. I believe 3E8 hex is 1000. For RPM I set the multiplexer value to 0. I have tried with the extended box checked and unchecked, it does not work either way. Do I need to change the endian settings? Or what do I need to change?

RaceCon copy

 

Hoping someone can help.

 

Richard Luciano

Link to comment
Share on other sites

Here are a few things:

- The CAN Id is correct 1000 (0x3E8)

- The CAN Id is NOT extended

- The data is sent in frames of 8 bytes.

- The first byte (byte 0) indicates what data is in the frames.  This is what is referred to as the compound Id.  When byte 0 is zero then it indicates the frame contains RPM, MAP, MGP.  When byte 0 is 1 the frame contains BAP, TP, Injector Duty Cycle

- The multiplexer field specifies the compound Id.  While technically it is 1 byte long, how you have it set up should be OK as byte 1 is always zero.  Besides the extended box being checked, everything looks correct to me in your picture.

- Some CAN setups change the byte numbering when you go from little to big endian.  Eg a two byte variable at byte 0 in big endian would start at byte 1 when little endian.

Are you able to receive anything?  Or is the data just erratic?

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Loading...
 Share

×
×
  • Create New...