Bruce:
The GPS' RS-232 TX wire must (eventually) be connected to the EFIS-D10A Pin 22; make sure you have continuity between those two points.
The GPS and EFIS-D10A must have a common ground (for the data flow to work). For example, if you're operating the GPS on battery power, there's no ground connection so the data connection won't work. If there's a ground pin available on the GPS, its equivalent on the EFIS-D10A is Pin 9.
The best way to connect a GPS to an EFIS-D10A is to connect the GPS through the 9-pin connector that's on every Dynon Avionics harness:
- Connect the GPS TX to the 9-pin connector, Pin 3
- Connect the GPS Ground to the 9-pin connector, Pin 5
Then, ensure that the settings are correct:
SETUP > HSI > LOCAL DATA PORT / EFIS/EMS SERIAL > EFIS SERIAL
INPUT - Set to GPS (or AUTO, which usually works, but not always)
BAUD RATE - Set to 4800 or 9600 whichever speed your GPS is transmitting at (or AUTO, which usually works, but not always)
Sorry i should have listed the lot for you
EFIS is a D10A with two servos through the AP74
The AV-MAP is a EKP4
I am off to the field today to do a double check on all the settings.
I have the latest software upgrade for the D10a but this issue occurred around the last AVMAP upgrade i cant recall whether it was before or after the upgrade
Thanks again