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G3x transponder 232 input question ?

Larry DeCamp

Well Known Member
The documents show the ADHRS input on all diagrams. But, they show the GDU460 or GPS20A in separate documents.
* I assume for a 2020 compliant system, the 20A should be routed to the 45R transponder ?
* Any reason the 460 display 232 should not be routed to 232#3 for backup ?
Thanks in advance !
 
G3Xt Manual rev AM

GDU460 is connected to GPS20A via CAN-bus.
GPS20A is connected to GTX45R via RS232, page 447.
GDU460 is connected to GTX45R via RS232, page 446.

Good luck
 
Thanks much Avanza

Is the 25 to 460 via 232 any value ??
Also, the 20A to 45R uses the same pins as the 460 to 45R. Is the 20A for WAAS 2020 compliant and the 460 just for normal Transponder performance ????
 
Last edited:
Is the 25 to 460 via 232 any value ??
Also, the 20A to 45R uses the same pins as the 460 to 45R. Is the 20A for WAAS 2020 compliant and the 460 just for normal Transponder performance ????

1) 25/460 = back up ahrs data
2) 460/45R = traffic/weather
3) 20A /45R = GPS data
 
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