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You can connect it to pin 3, however not directly. You need to put a resistor of relatively specific value ( can’t remember the value but it is in the instal instructions—- the value given is really wierd but dynon told me rounding is ok-check to insure ) in series with the connection.
On Nov 28, 2019, at 11:00 AM, KEN4ZZ via Groups.Io <ken4zz@...
Hi Scott- Since no one else has chimed in, I'll give it a shot.
From the SkyView installation manual, revision AD, page 11-11:
"Direct Serial GPS Position Input (Pin 3) Prior to 2016, the
only way for a SkyView system to comply with the FAA 2020 ADS-B
Out mandate was to connect a serial output from a certified GPS
to the Direct Serial GPS Position Input (Pin 3). As of January,
2016, Dynon Avionics offers the SV-GPS-2020 GPS Antenna/Receiver
Module which provides high-integrity GPS data compliant with the
FAA 2020 ADS-B Out mandate. The SV-GPS-2020 transmits
high-integrity GPS position data to the SkyView display(s),
which then transmit the high-integrity GPS position data to the
Thus, if an SV-GPS-2020 is installed, this input is not
As it says, since you have the SV-GPS-2020 installed on your
system, pin 3 is not used. Your 261 transponder will get all the
position data it needs to be 2020 compliant thru whichever serial
port (#1 - #4, since #5 is generally recommended for connecting
your SV-GPS-2020) you chose to connect it to the rest of your
If you had the older (non-2020 compliant) SV-GPS-250 for your
system, but also had a WAAS IFR GPS navigation unit (Garmin
430/530W, Avidyne 440/ 540, etc.) installed, you could route a
position signal from that WAAS to pin 3 to become 2020 compliant.
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
Cozy MKIV N78CZ