190-01115-01 G3X™/G3X Touch™ Avionics Installation Manual
Rev. AV Page 2-8
2.1.1.11 COM Radios
The G3X Touch system is capable of displaying and controlling up to two VHF COM radios. Supported
COM radios include:
Supported Garmin panel-mount COM radios can be controlled either using the GDU displays or through
their own front-panel controls.
The GTR 20 is a remote-mounted COM radio that is entirely controlled by the G3X Touch display, with no
front-panel interface. For GTR 20 installation information, refer to Section 19
and Section 25.
The interface between the G3X Touch system and the COM radio portion of a GTN, GNC 255, GNC 215,
or SL30 uses the same RS-232 connection described above for navigation data. Interface to a GTR 205 or
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 through the CAN bus.
For information on connecting and configuring COM radios with the G3X Touch system, refer to
Section 24
and Section 30.
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 using RS-232 to the standby position of connected radio.
2.1.1.12 NAV Radios
NAV Tuning
The G3X Touch system is capable of displaying and controlling up to two VHF NAV radios. Supported
NAV radios include:
• GNC 215
• GNC 255 (software version 2.20 or later)
• GTN 650/750 (software version 6.70 or later)
• SL30
Supported Garmin panel-mount NAV radios can be controlled either by the GDU displays or through their
own front-panel controls.
The interface between the G3X Touch system and the NAV radio portion of a GTN, GNC 255, or SL30
uses the same RS-232 connection described above for navigation data.
For information on connecting and configuring NAV radios with the G3X Touch system, refer to
Section 30.4.28
.
The legacy G3X system and GDU 37X displays do not support on-screen display or control of NAV
radios. However, GDU 37X displays do have the ability to send a NAV frequency by RS-232 to the
standby position of a connected radio.
• GNC 215 • GNC 255 (software version 2.10 or later)
• GNC 355 • GTN 635/650/750 (software version 6.11 or later)
• GTR 20 • GTR 200/200B
• GTR 205 • GTR 225 (software version 2.10 or later)
• SL30 • SL40
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