Everywhere. It's all over the 'net. The hardest part is figuring out where to start. I use OBDII every day at work but not at this level. I spent some time a few years ago trying to communicate...

There's a note in the documentation about a timeout while waiting for data to ensure items don't get lost of missed. Apparently if you know how many data items are going to be returned there's a way...

Here's a link to GM mode 6 PIDs.
http://service.gm.com/gmspo/mode6/

These can also be used as scan data.

That makes more sense. I checked the ELM327 documentation. Hyperterm is suggested as the easiest way to communicate with the chip which means yes, ASCII. If you're oldschool enough to have used...

So the comms are ASCII representation of hex?? Huh????? Did someone put Microsoft in charge of OBDII PID's???

Maybe I can find time to try hammering away at this PCM I have here using ASCII...