Garmin GTX 330 Installation Manual page 36

• STBY  Selects the standby mode. When in standby mode, the transponder does not reply to any
interrogations.
• ON 
Selects Mode A and Mode S. In this mode, the transponder replies to Mode A, Mode C
and Mode S interrogations, as indicated by the Reply Symbol ("
include altitude information.
• ALT 
Selects Mode A, Mode C and Mode S. In ALT mode, the transponder replies to
identification, altitude and Mode S interrogations as indicated by the Reply Symbol ("
Replies to altitude interrogations include the standard pressure altitude received from an
external altitude source, which is not adjusted for barometric pressure. The ALT mode may
be selected in aircraft not equipped with an optional altitude encoder; however, the reply
signal
Any time the function switch is in the ON or ALT position the transponder
becomes an active part of the Air Traffic Control Radar Beacon System
(ATCRBS). The transponder also responds to interrogations from TCAS equipped
aircraft.
• IDENT  Pressing the IDENT key activates the Special Position Identification (SPI) Pulse for 18
seconds, identifying the transponder return from others on an air traffic controller's screen.
During the IDENT period the word 'IDENT' appears in the upper left corner of the display.
• VFR 
Sets the transponder code to the pre-programmed VFR code selected in Configuration
Mode (Set to 1200 at the factory). Pressing the VFR key again restores the previous
identification code.
• FUNC  Changes the page shown on the right side of the display. Display data includes Pressure
Altitude, Flight Time, Altitude Monitor, Count Up and Count Down timers. In the
Configuration Mode, steps through the function pages.
• START/  Starts and stops the Altitude Monitor, Count Up, Count Down and Flight timers. In
STOP configuration mode, steps through functions in reverse.
• CRSR  Initiates entry of the starting time for the Count Down timer and cancels transponder code
entry. Selects changeable fields in Configuration Mode.
• CLR 
Resets the Count Up, Count Down and Flight timers. Cancels the previous keypress during
code selection and Count Down entry. Used in Configuration Mode.
• 8 
Reduces Contrast and Display Brightness when the respective fields are displayed and
enters the number eight into the Count Down timer. Used in Configuration Mode.
• 9 
Increases Contrast and Display Brightness when the respective fields are displayed and
enters the number nine into the Count Down timer. Used in Configuration Mode.
Page 5-2
Rev E
does
not include altitude information.
NOTE
®
"), but the replies do not
®
GTX 330 Installation Manual
190-00207-02
").