Paul of
928 ECU repair wired the diagnostic bus from my 964 Motronic. This way I'm able to connect it to the interface tool. It is a 3.6 conversion, I do not have the wiring with the standard diagnostic plug.
By the way this is his older model, the new models are much nicer.
So with the interface connected to the diagnostic bus of the Motronic and connected to my laptop running his diagnostic software I can basically read out all information the diagnostic bus can provide. It can read fault codes, read and log live data and for testing purposes you can put in some input signals to test switches, idle stab, injectors, etc.