Glad you mentioned the pinout section of the IM.
I brought out the old HDS and wired it back up. AIS.
Took a VOM to the Zeus comms cable. Hmmm together the orange and green have connectivity, but not alone.
Hmmm. What if I match to the wrong colors? Bingo! Cable wired backwards from the factory. Wire backwards to the GX2200 and triangles! No wonder the great price!