Garmin G3X Touch Pilot's Manual page 98

CNS Interface
STANDBY MODE (MANUAL)
In Standby, the transponder does not reply to interrogations, but new codes can be
entered. When Standby Mode is selected, a white STBY indication and transponder
code appear in the mode field of the Transponder Data Box.
MANUAL ON MODE
ON Mode can be selected at any time. ON Mode generates Mode A and Mode S
replies, but Mode C altitude reporting is inhibited. In ON Mode, a green ON indication
and transponder code appear in the mode field of the Transponder Data Box.
ALTITUDE MODE (AUTOMATIC OR MANUAL)
Altitude Mode is automatically selected when the aircraft becomes airborne. Altitude
Mode may also be selected manually.
If Altitude Mode is selected, a green ALT indication and transponder code appear
in the mode field of the Transponder Data Box, and all transponder replies requesting
altitude information are provided with pressure altitude information.
REPLY STATUS
When the transponder sends replies to interrogations, a green R indication appears
momentarily in the Transponder Data Box.
VFR CODE
The VFR code can be entered either manually or by touching VFR on the Transponder
Page. The pre-programmed VFR code is automatically displayed in the code field of the
Transponder Data Box.
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Garmin G3X Touch Pilot's Guide 190-01754-00 Rev. A