The Dynon GPS 2020 generates the GPS Out signal through the Xpnder 261. It should be set up on Serial port 5, Position 1, for it to work correctly.
If you can't get it this weekend, call up Dynon on their Tech Support phone # and set up an appointment with them to walk you through the sequence,while you are at the plane, M-F whatever their business hours are Pacific time.
A word to the wise, don't run the Dynon just off of the airplane main battery when doing this. You'll run the charge in it down. Get a battery charger on it while doing this sequence.
RV-12, KWHP based
"Time to Spare, go by Air."