FDS Elec/Cab Unit

I've recently purchased a Elec/Cab unit from FDS. Very nicely built ...BUT.....I can't get it to work with Prosim 737. Marty from Prosim said his program has ALL the variables needed to make it work and that several Prosim users have used the FDS system. Anyone reading this that has purchased the FDS system I would like to know how you got it to work. I am using Prossim 737 exclusively, I know the FDS system is wired right and IS getting voltage from the USB plug. Hope someone can help me, and as always a BIG THANKS in advance. Dave