Dynon Xponder and HDX wiring

Scott Fish

Thought I'd give the new canard zone a try with a question I've been searching on today without success:

 I've got a Dynon Xponder 261 (2020 ADSB-OUT compliant) and a Dynon HDX display and Dynon's GPS 2020.  The wiring for the Xponder shows a serial interface with the HDX in both directions and it appears to be working in the sense that it provides ALT out, but I've not checked with others in flight yet to see if I'm showing up on their ADSB-IN displays.  

Here's my question:  The Xponder wiring diagram also shows an optional GPS data input to the Xponder that I've not wired yet.  Does the Dynon Xponder 261 get it's GPS information from the HDX (which most definitely has the GPS wired to it) over the HDX<->Xponder serial port, or do I have to wire this external GPS input in addition to the HDX serial lines to get the full benefit of GPS over the ADSB-OUT functionality of the Xponder?


Scott Fish
Cozy MKIV  N78CZ

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