You can download the manual from the 3rd Rail website. ERR User Manuals at 3rd Rail. Here's the direct link to the CC_M manual: ERR Cruise Commander M Instruction Manual.
Note that there are two firmware versions of the CC-M, and if you have the Odyssey one, the green wire on pin 2 has the diesel ramp-up signal, if you have the steam or plain diesel one, the green wire is a repeat of the serial data and is intended to buffer it for additional drive.