Well, I've tried taking a meter to the pins and haven't come to anything conclusive. The pins aren't numbered. They don't go direct to ground (neg on the battery) so they must go through some processing chip. Not sure how to map them to the 9 pins of the RS-232. Two pins read -3 and +3 with the battery connected but that doesn't get me too far. Anyone else tried wiring the pins in various combinations? I'm guessing since they have an 8 pin connector that they are actually using the flow control pins, or else they would have gone with a smaller and simpler connector.