Originally Posted by RV7ator
For our Garmin experts:
The GTX23 manual, (rev. A, C-1) assigns pin 43 of its connector to the RS-232-1 signal ground. The GSU manual (rev. G, D-3) says pin 51 which is "not used" in the GTX manual. Which is correct?
I checked the PC board schematic, and Stein is correct that GTX23ES pin 43 is a ground and will work fine. GTX23ES pin 51 is also connected to the same ground and will work fine.
We always tell customers that we try to include enough wiring information in the G3X Installation Manual to properly connect these devices to the core G3X components like the GSU73. The transponder connection and configuration information on page D-3 is correct and should be used to connect and configure your GTX23ES transponder.
Let us know if you have additional questions.