Serial line grounds

[s24789]

Trying to figure out how Dynon expects the low side (ground) for the RS232 conenctions from Garmin 496 and SL-30. All documentation (FlightDek 180) makes no mention of the grounds from these units. Please advise. Thanks in advance :-/

 

[dynonsupport]

As long as the X96 is grounded to the airframe, which it will be if you are powering it off the plane, there is no other connection needed. The SL-30 is already grounded, so no connection needed their either. RS-232 is a single ended connection so as long as grounds are shared in the system it will work.

 

[s24789]

merci

 

[PhantomPholly]

CAUTION:

If for some strange reason you run the x96 only from internal battery power, and do NOT have it hooked up to the same ground bus as the Dynon, they may not communicate. I discovered this when wiring at home prior to installing in the aircraft - I had just the "live" serial wire connected to the EFIS and both were running off of battery power.

Just make sure both are grounded to the common avionics ground bus/bar/plate/ or whatever you ground stuff to.