Our experience was otherwise, but please go ahead correct where you see fit. I'll clarify.
Our local avionics shop used their laptop to program our GTX335 to send transponder code/status and receive altitude encoder information. I can't be sure of the settings on the Garmin side.
The Dynon serial port 4 was set to send ICARUS Altitude and receive Garmin 330ES.
We had the two units talking ICARUS together and the Garmin was happy to show pressure altitude, but the Skyview would only show transponder status (ALT, GND etc) and VFR code but not individual assigned/set codes. If we typed 3000, or any random number into the Garmin the Skyview would show either 1200 or 2100.
The avionics rep suggested we needed another port, which we currently don't have available.
There was a thread by dwrichey that has been removed in the same week that I stumbled upon it from which we based our settings upon. I'll attach a screen print.
Thoughts?