190-01115-01 G3X/G3X Touch Installation Manual - Installation Preparation
Rev. AC Page 2-10
The GTS 8XX active traffic system is compatible with the G3X system. The GTS interface to the G3X
system requires an RS-232 connection to a GDU display and an ARINC 429 connection to the GAD 29.
TCAS-capable GTS 8XX units also require an ARINC 429 connection to the GTX transponder.
TIS-A traffic data can be provided by GTX 23ES, 33, 330, and GTX 335/335R transponders. Traffic data
is provided to the G3X system via the CAN bus from the #1 ADAHRS unit, to which the transponder is
connected.
Traffic data from various third-party devices that emulate the Garmin TIS-A format is supported, via an
RS-232 connection from the traffic device to a GDU display.
For any of the above data sources, traffic data is shared between GDU displays via the CAN bus. If
multiple sources of traffic data are available, the best source is selected automatically. Refer to the Pilot’s
Guide for further information on traffic data source selection.
In an installation that includes a GTN/GNS navigator and transponder with ADS-B or TIS-A traffic
capability, traffic data is provided to the GTN/GNS via an ARINC 429 or HSDB (High Speed Data Bus)
connection. For further information, refer to Section 26
and the transponder installation manual.
2.1.1.17 Electrical System
The G3X system supports a variety of connections to the aircraft’s electrical system:
Most important LRUs support dual power inputs, allowing them to be powered from separate dual
electrical busses. Alternatively, one of the power inputs may be connected to a backup battery to ensure
adequate electrical power supply in the event of alternator failure, or during engine start. Backup batteries
designed for the G3X system are available from third-party suppliers, or a backup battery can be integrated
into the aircraft’s electrical system design in order to power additional devices.
In a G3X Touch system with GDU 4XX displays, the GAD 27 electrical control system provides low-
voltage protection during engine start, as well as control of the flaps, trim, external lighting, and cockpit
lights. The GAD 27 is not compatible with legacy G3X systems that use GDU 37X displays. For further
GAD 27 installation information, refer to Section 3
and Section 26.
If the aircraft is equipped with a cockpit light dimming system, the GDU displays and various other
Garmin panel-mount avionics support connection to the dimming bus to control display brightness.
The G3X system is compatible with Vertical Power products, via an RS-232 connection to a GDU display.
For further information on interfacing Vertical Power products to the G3X system, consult the
manufacturer.
2.1.1.18 Audio
The G3X system interacts with the aircraft’s audio system in the following ways:
• Audio alerts are generated by the GDU displays for various events, including audio notification of
abnormal conditions. Typically, alert audio from the PFD1 GDU is wired to the aircraft’s audio
panel or intercom.
• Stereo audio for XM music is provided by the GDU 3X5 and GDU 4X5 displays, and can be
connected to any stereo audio panel or intercom.
• A G3X Touch system with GDU 4XX displays may be connected via the CAN bus to the
GMA 245/245R audio panels, allowing full control of audio panel functionality from the GDU
display. The GMA 245 is a panel-mounted digital audio panel with intercom and Bluetooth input;
the GMA 245R has the same capabilities but is remote-mounted with no front-panel controls. For
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