mainwheel,
The problem is not so much the ARINC outputs from the FCU (I can decode that already) but the inputs to the unit. There are two ARINC inputs that I can see, one from each FMGEC. They both send labels on the FMGEC G GE-1 channel to their respective sides (Ref ASM 22-86-04). I need to make sure I am sending the correct labels to talk to the unit, as perhaps I am missing some!
Things like the discretes from AP/ATHR/FD engagement I think I have wired correctly. Obviously you are right, there is a fair amount of 'adaptations' as it's not connected to a real aircraft, but for example it's easy to ground the FCU HLTHY A/B/C and fool the unit into thinking everything is operating ok.
If you'd rather I send you a private message rather than going into great detail here let me know, whatever works best.
Thanks again!
Horgy