Quote from padgett on November 30, 2012
After running TorqueScan I have quire a few results in the form of Command 210f response 7E9037F2178. All seem to start with 7E9. Some have many responses (and wind up with Buffer Full), some have several, some have just one. How do I interpret these responses ? (If fourth digit is 0 then just one, if 1 then more than one. From there I need help.

Any further interpretations welcome.

http://en.wikipedia.org/wiki/OBD-II_PIDs#CAN_.2811-bit.29_Bus_format

Look under: Response

7E9 is the CAN ID of the device that is responding to your query, its always there and contains only the ID of the device that is responding. Torque sends out a request (IIRC) at 7DF (broadcast), but you don't see that. So when you send 210F, Torque is sending 7DF 02 21 0F. 02 is the number of bytes following. The response is 7E9 03 7F 21 78. 03 is how many data Bytes follow, 7F 21 78 is the data, but 7F in byte 1 usually means that the module doesn't recognize the request.