This is info received
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What GPS is driving your transponder? Which transponder are you using? Do you have the transponder setup properly in the Transponder settings page?
Ifd540 driving transponder, sv261, mode s, aircraft Id set correctly all screens, resistor to pin 3 input. Not sure of any other settings on 540 but is set according to Quick panel instructions.
On the AF-5000 verify your GPS Settings on the Transponder setup page. You should have AVIDYNE (Avi) selected.
On the 540 you should have ADS-B (Avi) as an RS232 output channel.
If this is correct you may need software updates in one or both of the devices.
I had a wrong setting on setup for gps, I had afs250, changed it to avi but now I get no response from adsb website where I could check the info. My transponder shows updated, have current afs software. I will verify by setting back to afs250 to be sure that’s the only variable in case I set something unaware.
Had a disconnected wiire from gps to transponder.