Quote Originally Posted by kur4o View Post
ALso the ccm seems to respond differently to F0 and F1 functional addresses. F0 is general communication and F1 is for special functions.
Correct. F0 is for when the CCM polls the ALDL for an external device (such as a Tech 2). If there is no response to the F0 poll, nothing happens, the CCM continues to operate as normal. But if that poll is answered by an F1 command, then it executes whatever that command is before returning to normal operation. The CCM sends this F0 poll once per second.