190-01115-01 G3X™/G3X Touch™ Avionics Installation Manual
Rev. AV Page 2-9
2.1.1.13 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 2.1.1.14
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 data transceiver. A G3X Touch system with GDU 4XX displays supports ADS-B In using the
GTX™ 45R/345/345R transponder, the GDL 39R, or the GDL 52R.
For additional information on interfacing a transponder to the G3X Touch system, see Section 2.1.1.14
.
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).
2.1.1.14 Transponder
The G3X system can interface to any Garmin transponder with a digital interface (all models except the
GTX 320). The transponder code, operating mode, and flight ID can all be displayed and controlled using
the GDU displays.
A panel-mount transponder such as the GNX 375, GTX 327, 328, 330, 335 and 345 can be controlled
either from the GDU displays or by the transponder’s front-panel interface. Remote-mount transponders
such as the GTX 23ES, 32, 33, 35R/45R and GTX 335R/345R lack front-panel controls, and are controlled
only using the GDU displays. The diversity GTX 345D, GTX 335D, GTX 335RD, and GTX 345RD are
all supported.
The transponder connects using RS-232 to the #1 ADAHRS unit, which relays transponder data to the rest
of the G3X system through the CAN bus. The ADAHRS provides pressure altitude data to the transponder,
so a separate altitude encoder is not required. A second connection from the transponder to the #2
ADAHRS can be made to provide a backup datapath for this information.
In a G3X system with a transponder and a GTN, the transponder is typically controlled by the G3X system,
not the GTN. Note the GTX 23ES and GTX 35R/45R can only be controlled by the G3X system, not by
the GTN.
The GTX 23ES, 33ES, 35R, 45R, 330ES, 335/335R/335D/335RD, and GTX 345/345R/345D/345RD are
Mode S transponders with extended squitter capability. When provided with a GPS position source that
meets the TSO performance requirements specified in 14 CFR 91.227, these transponders are an
acceptable method of complying with the requirements for ADS-B Out. Compliant GPS position sources
include the GPS 20A, GTN, GNS WAAS units, or the internal WAAS GPS contained in certain models of
the GTX 335/345. The GDU GPS receiver does not meet the TSO GPS requirements, thus it is not
sufficient to provide position data to a transponder for ADS-B Out compliance.
Certain transponders support ADS-B or TIS-A traffic data, and/or FIS-B weather data. See below for
information on traffic (Section 2.1.1.17
) and weather (Section 2.1.1.16) interface capabilities.
For information on connecting and configuring a transponder with the G3X system, refer to Section 24
and
Appendix H
or Section 30. Refer to Section 32 for information on performing periodic tests of the
transponder.
For information on installing remote transponders, refer to 190-00906-01 for the GTX 23ES, or
190-01499-10 for the GTX 35R/45R. For all other transponders, refer to the appropriate installation
manual.
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