Garmin GTX 330, GTXTM 330D TRANSPONDER INSTALLATION MANUAL
Brand: Garmin, Pages: 71
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Page 5-14 GTX 330 Installation Manual
FORMAT (Altitude Format)
This field determines how the pressure altitude is shown on the GTX 330 display.
(Flight Level)DEFAULT. The pressure altitude is displayed in hundreds of feet. For
example, a pressure altitude of 12,300 feet is displayed as “FL 123”.
FEETPressure altitude is displayed in feet.
METERSPressure altitude is displayed in meters.
VFR ID (VFR Transponder Code)
This field is the four-digit code that is selected when the user presses the GTX 330 VFR key. In the
United States, 1200 is the VFR code for any altitude. The default is set to 1200.
ALTITUDE ALERT DEVIATION (Altitude Format)
This field determines the amount of altitude difference from selected altitude to generate an altitude alert
deviation. It is set to 200 feet, the minimum altitude, at the factory.
The squat switch field may be set to either YES or NO.
Selecting YES in this field sets the GTX 330 to use the squat
switch to determine lift off. Selecting NO sets the GTX 330 to use Automated Airborne Determination
from other sources.
This is the number of seconds the aircraft must be on the ground before the AUTO STANDBY feature
automatically switches to standby mode when the airborne source is the squat switch. It has a range of 0
(zero) seconds to 99 seconds, with the default set to 24 seconds.
AUTO FLIGHT TIMER
Available choices are MAN, CLEAR and ACCUM. Selecting CLEAR resets flight time to zero and
starts the flight timer when lift off is sensed.
MANManual selection. DEFAULT. Flight timer START/STOP is controlled
manually by the pilot.
CLEARAutomated flight timer START/STOP resets to zero at every lift off.
ACCUMAutomated flight timer START/STOP accumulates, meaning, it continues
counting up at lift off.
Second CONFIGURATION Page
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GTX 330 Installation Manual Page 5-15
5.2.11 Temperature Page
Sets the Sensor to YES or NO. Default is NO.
Sets the units to degrees Fahrenheit or Centigrade. Default is degrees C.
5.2.12 Mode S Address Entry Pages
Aircraft Registration or Flight ID Number Page
It is VERY important to enter the Mode S address correctly in the GTX 330.
When the unit is turned on for the first time, or an invalid
address is recognized, the unit prompts the user to enter a valid
Once the aircraft address is entered, the unit remains on in the
same mode as before. Flight ID can be entered in TSO Class 2A
units, P/N 010-00230-( ) and 010-00293-( ).
For first time turn-on proceed to step 5. Otherwise begin at step 1, with the unit turned off:
1. To enter the configuration pages, press and hold the FUNC key while powering on
2. Power the unit on by pressing the ON, ALT, or STBY key (while holding the FUNC
key) or turn on with the avionics master switch. The unit performs a self-test routine
and displays a "Jump to Diagnostics" page.
3. Press the FUNC key repeatedly to toggle through the pages until you come to the
address entry page, or for a shortcut, select the Aircraft Configuration Menu page
(see para 5.2.1.) and then toggle the FUNC key three times.
a. The page that appears is either as ADDRESS HEX _ _ _ _ _ _ .
b. Or as ADDRESS US TAIL# N _ _ _ _ _ .
It is not necessary for the installer to convert the aircraft registration number
(N-number for US registry aircraft) to a Hex address. The GTX 330 converts
the registration number to hexadecimal automatically.
4. To select between Hex or Tail number, press the CRSR key, then 8 or 9 key to
move to the correct selection.
5. For entering either the address hex code or the US registration number, press the
CRSR key 1 time. (This highlights the address field).
MODE S Address (A/C Reg) Page
MODE S Address (Flight ID) Page
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Page 5-16 GTX 330 Installation Manual
7. Enter the aircraft address using the number keys. Press a key repeatedly to scroll
through the digit/alpha characters for that key.
8. Press the CRSR key to select the next numeric entry field. Enter the next character
as stated in step 7, then move onto the next one, repeating the process until the
complete number is entered.
9. When finished, press the CRSR key to accept the number entry.
10. Using the FUNC and/or START/STOP keys, toggle through the pages to get off of,
then back onto the aircraft address page. Verify that the address is correct.
The unit now contains a Mode S address and may be turned off. To power the unit on in the normal
mode, press only the ON,ALT, or STBYkey (without holding the FUNC key) or turn on with the
avionics master switch.
MODE S ADDRESS, AIRCRAFT REGISTRATION PAGE
US TAIL #N-Registration Number
HEXHexadecimal code address
MODE S ADDRESS, FLIGHT ID PAGE
SAME AS TAILIf address is a US registration number, FLT ID can be the same.
POWER UP ENTRYEnter FLT ID every time the unit is turned on in normal mode.
CONFIG ENTRYEnter FLT ID in configuration mode only.
5.2.13 Mode S Aircraft Type Page
Used for air to air communication with TCAS.
AC TYPEUNKNOWN, <15.5K Lb, >=15.5K Lb, or ROTOR.
MAX AIRSPEEDUNKNOWN, <=75 kt, <=150 kt, <=300 kt, or >300 kt.
Sets the AIRCRAFT TYPE Message to ROTOR, to a weight of less than 15,500 pounds, more than or
equal to 15,500 pounds, or unknown weight. Defaults to less than 15,500 pounds.
Sets the AIRCRAFT AIRSPEED Message to a speed of less than or equal to 75 knots, between 75 knots
and 150 knots, between 150 knots and 300 knots, more than 300 knots, or unknown airspeed. Defaults to
less than or equal to 150 knots. Enter the aircraft's maximum cruising true airspeed capability.
MODE S (A/C Type) Page
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GTX 330 Installation Manual Page 5-17
5.2.14 Gray Code Input Page
This field shows the status (1 = ground, 0 = open) of each of the ten gray code altitude inputs. This
information may aid in installation troubleshooting. This page is not used in systems that contain serial
This field displays the gray code altitude input in feet. Verify that it is the correct altitude.
5.2.15 External Switch State Page
This field displays the state of the EXTERNAL IDENT discrete input. The box is filled when
EXTERNAL IDENT is grounded.
This field displays the state of the EXTERNAL STANDBY discrete input. The box is filled when
EXTERNAL STANDBY is grounded. If EXTERNAL STANDBY is active during power-up, the word
FAIL appears on the screen after 30 seconds.
This field displays the state of the SQUAT SWITCH input. The box is filled when the SQUAT SWITCH
input is active (the aircraft is on the ground as configured on the SETUP 2 page).
5.2.16 Analog Input Page
The Analog to Digital Converter counts are shown on the
display, providing troubleshooting data.
This field displays the input level of the 14/5 V lighting bus.
This field displays the input level of the photocell.
This field displays the input level of the LCD temperature sensor.
This field displays the input level of the 28 V lighting bus.
GRAY CODE INPUT Page
EXTERNAL SWITCH Page
ANALOG INPUT Page
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Page 5-18 GTX 330 Installation Manual
This field displays the input level from the outside air temperature sensor.
This field displays the input level from the unit temperature sensor.
5.2.17 RS-232 Input Page
Depending on the selected inputs on Channel 1 and Channel 2 from the RS-232 Input page (ref para
5.2.9), this page displays the information received on the channel. If GPS is selected as an input ground
speed can be viewed (GSPD), latitude (LAT), longitude (LON) and track (TRK).
If ICARUS or SHADIN-ALT is selected as an input pressure altitude (PALT) can be viewed.
If FADC or ADC is selected as an input, true or static air temperature (SAT), outside or total air
temperature (TAT), indicated air speed (IAS), true air speed (TAS), density altitude (DALT), pressure
altitude (PALT*), current barometric pressure (BARO) and vertical speed (VSPD) can be viewed.
GSPDGround speed in knots
LATLatitude in degrees
LONLongitude in degrees
TRKTrack in degrees
GSPDGround speed in knots
PALTPressure altitude in feet
* If ADC W/ALT or FADC W/ALT format selected.
5.2.18 ARINC 429 Channels Pages
The GTX 330 receives one of the following sets of ARINC 429
data on either ARINC 429 receivers #1, #2 or #3. The labels are
chosen when selected in ARINC 429 INPUT, Section 5.2.8.
The received data may be at either LOW or HIGH speed. The
default is LOW. The transmit data labels and their rate are as
RS-232 INPUT Page
ARINC 429 CHANNELS 1 and 2
ARINC 429 CHANNELS 3 and 4