190-01115-01 G3X™/G3X Touch™ Avionics Installation Manual
Rev. AV Page 30-169
30.4.27 COM Radio Configuration Page
The GDU 4XX supports on-screen control of up to two VHF communication radios (COM1 and COM2).
The Connection setting informs the system how each of the two supported com radios is connected. Select
None if on-screen radio control for a particular radio is not desired or no radio is installed. Network Radio
LRU 1 and Network Radio LRU 2 settings support Garmin radio LRUs that are connected through the
CAN bus, (GTR 20 and GTR 200) see Table 30-19
.
If an RS-232 format that supports remote com radio data has previously been configured, additional
RS-232 connection methods will appear in the list (for example, PFD1 RS-232 2). On-screen com radio
control is supported by the following RS-232 formats: Garmin VHF Comm, Garmin VHF Nav/Com, and
MapMX. The specific radio functionality that can be controlled using an RS-232 connection depends on
the features supported by the software version used by the com radio (Table 30-19
).
1. In configuration mode, use the Touch Panel or a Move Selector Knob to select the COM Radio
Configuration Page.
2. Use the Touch Panel or a Move Selector Knob to select the desired configurable item and make the
desired change.
3. Press the Back key to return to the Configuration Mode page when finished (if desired).
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