Com Radios; Ads-B - Garmin G3X Touch Installation Manual

the #2 navigation source should be connected either to a higher-numbered RS-232 port on the PFD1 GDU,
or to any RS-232 port on the MFD1 GDU. For additional information, refer to Section 2.5.1.
The G3X Touch system can send basic flight plan data to a GTN or GNS WAAS navigator, allowing VFR
flight plans to be created on the G3X system and uploaded to the IFR navigator. The GDU 4XX display in
a G3X Touch system can also act as a relay between the GTN/GNS navigator and a tablet computer, via
Bluetooth (seeSection 2.1.1.22). Flight plan transfer capability requires a second RS-232 connection
between the PFD1 GDU and the #1 GTN/GNS navigator, using the "Connext" RS-232 format. The
Connext interface and Bluetooth are not supported by the legacy G3X system and GDU 37X display.
If a G5 standby display instrument is installed, data from the external navigation source selected on the
G3X PFD is also displayed on the G5. This requires an ARINC 429 connection between the navigator,
GAD 29, and G5. If no GDU displays are present, the G5will display data from the #1 navigation source.
For detailed information on connecting external navigators to a G3X system, refer to Section 26.

2.1.1.11 COM Radios

The G3X Touch system is capable of displaying and controlling up to two VHF COM radios. Garmin
panel-mount COM radios that can be remotely controlled by the G3X Touch system include the
GTN 635/650/750, GNC 255, GTR 225, GTR 200, SL30 and SL40. These COM radios can be controlled
either via the GDU displays or via their own front-panel controls.
The GTR 20 is a remote-mounted COM radio that is entirely controlled via the G3X Touch display, with
no front-panel interface. For GTR 20 installation information, refer to Section 21 and Section 28.
The interface between the G3X Touch system and the COM radio portion of a GTN, GNC 255, or SL30
uses the same RS-232 connection described above for navigation data. Interface to an SL40 COM radio
requires a dedicated RS-232 connection to a GDU display. The GTR 20 and GTR 200 connect to the G3X
Touch system via the CAN bus.
For information on connecting and configuring COM radios with the G3X Touch system, refer to
Section 26 and Section 34.
The legacy G3X system and GDU 37X displays do not support on-screen display or control of COM
radios, and are not compatible with the GTR 20. However, GDU 37X displays do have the ability to send a
COM frequency via RS-232 to the standby position of connected radio.

2.1.1.12 ADS-B

When equipped with a Mode S transponder with extended squitter capability, and a GPS position source
that meets TSO performance requirements, the G3X system provides full ADS-B Out capability. Refer to
Section 2.1.1.13 for additional information.
The G3X system also supports full ADS-B In capabilities, including FIS-B weather and dual-frequency
traffic data reception. In a legacy G3X system with GDU 37X displays, ADS-B In is provided by the GDL
39R receiver. A G3X Touch system with GDU 4XX displays supports ADS-B In via the GTX 45R/345/
345R transponders, the GDL 39R, or the GDL 52R.
For additional information on interfacing a transponder to the G3X Touch system, see Section 2.1.1.13.
For information on interfacing a GDL 39R or GDL 52R ADS-B receiver, see the appropriate installation
guide (190-11110-00 or 190-02087-10).
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