Timberwolf
Well Known Member
Garmin does a phenomenal job of putting out schematics for all things experimental....except transponder interfaces. I figured that one out the hard way installing a GTX 345 in with a G3X system and GTN650.
I'm now installing a GTX35R in my -6 with a G3X and GTN 625, but the have again noticed the literature is lacking. The schematics show only what to hookup for a 45R, but I can't find anywhere that it explains where the control for the unit comes from. I've deduced I'll need the following, if anyone can verify it would be greatly appreciated.
RS-232 connection to GSU25 (Encoder info)
RS-232 connection to GDU 4xx ( I assume that with it configurd to Connext 57600 Baud this is used to actually control the transponder, though it never says that anywhere...it just says ADSB traffic/weather which isn't applicable to the 35R)
Ethernet connection to GTN 625 (out 3A/3B) Provides GPS position
However I can assume no connection needed to GTN625 Ethernet IN 3A/3B.....or are these connected for TIS-A traffic?
I'm now installing a GTX35R in my -6 with a G3X and GTN 625, but the have again noticed the literature is lacking. The schematics show only what to hookup for a 45R, but I can't find anywhere that it explains where the control for the unit comes from. I've deduced I'll need the following, if anyone can verify it would be greatly appreciated.
RS-232 connection to GSU25 (Encoder info)
RS-232 connection to GDU 4xx ( I assume that with it configurd to Connext 57600 Baud this is used to actually control the transponder, though it never says that anywhere...it just says ADSB traffic/weather which isn't applicable to the 35R)
Ethernet connection to GTN 625 (out 3A/3B) Provides GPS position
However I can assume no connection needed to GTN625 Ethernet IN 3A/3B.....or are these connected for TIS-A traffic?