This is where we might have problems. That design is very similar in concept to the ELM323 but just that little bit different. I'll have to compare the commands etc to see what's different exactly.

Unfortunately, I've already bought the ELM323 and designed the PCB for it. And FreeDiag doesn't support it I may build one of those supported interfaces instead if enough people here have the same one. Perhaps I should have asked here first.

Anyhoo, those who already have interfaces, speak now or forever hold thy peace.