Maintenance Manual
190-02472-02
G3X Touch EFIS Part 23 AML STC
Revision 2
Page 16
(5) A GTS 8XX traffic system cannot be interfaced to the GDU if an ADS-B In transponder such as
the GTX 345(R) or GNX 375 is installed.
(6) If a non-Garmin autopilot is installed, only one external navigator (GPS and/or VHF) can be
connected to G3X. A second navigator, if installed, must use a dedicated CDI and cannot
interface to G3X.
GDU 232 Ports:
GDUs have six RS-232 ports.
Except as noted below,
the ports can be connected to any compatible LRU
and if multiple GDUs are installed they will share the data between them on the CAN bus. The RS-232
architecture shown above is only an example configuration.
The port on the P4x01 connector is only compatible with the GSU 25D or GEA24. The five ports on
P4x02 can be configured for any supported interface (including GSU 25D and GEA 24).
When two external navigators are connected, the #1 Nav must be connected to a lower numbered RS-
232 port on the PFD, and the #2 Nav connected to either a higher numbered port on the PFD or any 232
port on the MFD.
GTN Connext interface must be connected to PFD1.
Weather data is not shared between GDUs, therefore the traffic/weather receiver (GNX 375, GTX 345() or
GDL 5xR) should be connected via RS-232 to each GDU. If both SXM and ADS-B In are desired in a
fully optioned single GDU installation (PFD, EIS, and dual Garmin navigators), a GDL 52R should be
used for 232 port availability considerations (the 52R sends both SXM and FIS-B/TIS-B on one RS-232
bus). Note however that the GDL 5xR is not compatible with the GTN, so if ADS-B traffic & weather
display is desired on both G3X and GTN it must be sourced from a GNX 375 or GTX 345() per Note 2
(alternatively, the GTN could use GDL 88 or GDL 69, but these are incompatible with G3X).
GTX 335R/345R:
RS-232 port 1 on the GTX335R/345R must be used to connect to the GSU 25D.
Summary of Contents for G3X Touch
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