Possible Comm Problems?

[Dave3891]

I am building a Gen 3 LS PCM to Mazda Can-BUS conversion board and I have a couple questions regarding VPW.

My plan is to use the VPW network to send OBD2 requests (RPM, Temp, Etc) and receive them, then convert and transmit over the Can-BUS.

Is there any problems having a hard wired device that uses the off board device addressing ($68, $6A, $F1) full time on the VPW bus?

Would this interfere with other scan tools or with HPTuners programming the PCM?

Should I be using a different address for this application?





Thanks
Dave

[Keith@HPTuners]

There is no issue with having it hard wired, however it will interfere with other scan tools, and will also interfere with reprogramming.

If you use a different address and respect the protocol, that might work, like $F3. You need to repsect the disable comms messages and not broadcast during programming, etc..

[Dave3891]

So when HPTuners wants to reprogram, it sends the disable comms message?
What address does HPTuners use?
Can you post what the full disable comms message would look like?