Wiring a GNS-430w and GNA-240

[akschu]

Forum,

I'm working on my wiring diagram and bumped into this problem:

On the 430W I have the following for COM1:

P4002-4 COM MIC KEY
P4002-6 COM MIC AUDIO HI
P4002-7 500ohm COM AUDIO HI
P4002-18 COM MIC AUDIO LO
P4002-19 500ohm COM AUDIO LO

Basically a low and high for both mic and speaker along with a key.

On the 240 I have the following for COM1:
J2401-9 COM 1 AUDIO IN HI
J2401-10 COM 1 AUDIO LO
J2401-11 COM 1 MIC AUDIO OUT HI
J2401-12 COM1 MIC KEY OUT

So there isn't a MIC LO on the 240. According to the documentation AUDIO LO is the ground reference for COM 1 (I assume both MIC and AUDIO), so how do I wire for this? Combine both MIC LO AND COM LO on the 430 and connect them to the AUDIO LO on the 240? Or can I just leave out MIC LO on the 430?

Thanks,
schu

 

[flickroll]

I ran in to this today. A quick email to my avionics tech was replied with 'connect Com Mic Audio Lo to the ground lug'.