Originally Posted by PilotCR3
The G3X Manual linked above instructed the GTN to be on
A.ON THE GTN 6XX/7XX RS-232 CONFIG PAGE
SET RS-232 CHANNEL 1 INPUT AND OUTPUT FORMATS TO "PANEL GTX w/TIS #1"
when doing that, I received the "No ADS-B" message on the transponder, so I switched it to ADS-B+ as you instructed, but still receiving the BALt failure. I believe it might be because I changed it then took right back off, so the PAR report could have the flights confused. I will fly again tomorrow to check, just wanted to make sure there wasn't anything needed in ARINC field on the transponder, I'll just set it to off.
Just so there is no confusion on what is needed to transmit ADS-B+ GPS data from the GTN to the GTX 330ES, here is a repeat of the guidance provided above from page 27-32 of the Rev. AP G3X/G3X Touch installation manual.
GTN 6XX/7XX, GNS 4XXW/5XXW (WHEN ADS-B OUT IS BEING PROVIDED TO ES TRANSPONDER)
A.ON THE GTN/GNS RS-232 CONFIG MODE PAGE SET SET RS-232 OUTPUT FORMAT TO "ADS-B+" OR "ADS-B+ FORMAT 1" FOR RS-232 PORT CONNECTED TO TRANSPONDER RS-232 IN CHANNEL 2
B. ON THE GTX 33ES/330ES RS-232 CONFIG MODE PAGE SET SET RS-232 INPUT FORMAT TO "REMOTE" FOR RS-232 CHANNEL 2 CONNECTED TO GTN/GNS ADS-B+ OUTPUT
Keep in mind that the missing BAlt data may be a wiring problem, not a configuration problem.
When you go into the transponder configuration page on the PFD (in config mode), does it show a green check mark at the bottom (indicating good communication between the GSU 73 and the GTX 330ES)?