GARMIN GTX 345DR G3X Touch Pilot’s User Guide
- June 7, 2024
- Garmin
Table of Contents
G3X Touch Pilot’s Guide Addendum for the GTX 345DR
Beginning with G3X Touch software version 8.81, the G3X Touch can be
configured to provide display and control for the GTX 345DR transponder with
Extended Modes (IFF Modes 1 and 2) enabled. IFF (Identification Friend or Foe)
is the military designation used by Air Traffic Control (ATC) to identify and
track military aircraft. The GTX 345DR transponder does not support IFF Modes
4 or 5. In addition, support for Mode A/C Lock remote control was also added
to provide a means to inhibit all transmissions that include aircraft
identification (ICAO address, tail number, flight ID, etc.) and position data.
Only the GTX 345DR transponder is compatible with the G3X Touch for this
purpose. These features must be enabled on the transponder using the GTX PC
tool (all other configuration items are handled by the GDU). Once a
transponder with these features enabled is connected to the G3X Touch, the
Transponder Configuration Page displays new configuration items, and new user
interface controls.
CONFIGURATION
EXTENDED MODES
When a transponder with extended modes enabled (using the GTX PC tool) is
connected to the G3X Touch, the following new configuration items are
displayed on the Transponder Configuration Page:
- Mode 1 Code Length – Selects the number of digits to be used for Mode 1 IFF codes. The default is two, which allows for up to 32 IFF codes. You can select four, allowing up to 4096 codes.
- Emergency Mode Discrete – When enabled, a discrete input on the GTX will be configured as an additional way to trigger the IFF emergency mode (pin 10 on GTX J3251, active low). Due to the way the GTX works, IFF emergency can always be enabled via our user interface, but the discrete input takes precedence when active.
MODE A/C LOCK
When a transponder with Mode A/C Lock enabled (using the GTX PC tool) is
connected to the G3X Touch, the following new configuration item is displayed
on the Transponder Configuration Page.
- Mode A/C Lock Discrete – If enabled, Mode A/C Lock is only controllable via discrete input to the transponder (GTX J3251, pin 11, active low), and is not controllable through the G3X Touch user interface.
PILOT INTERFACE
EXTENDED MODES
Each IFF mode has its own code and can be enabled or disabled individually.
The Mode 3/A code in the data bar is displayed in green when airborne, Mode 3/A is enabled, and the transponder is not in Standby mode. The 1, 2, and 3 characters are displayed in either white or gray, which indicates their enabled/disabled state. The mode is highlighted green when the transponder is replying.
IFF EMERGENCY MODE
When Emergency Mode is enabled, the GTX 345DR includes emergency data replies
to Mode 1, 2, and 3/A interrogations. Also, the Mode 3/A code is held at 7700
while Emergency Mode is active. Once Emergency Mode is disabled, Mode 3/A
reverts to the code previously entered by the pilot prior to enabling
Emergency Mode. Emergency Mode can be enabled or disabled by either a button
on the GDU or by an optional discrete input and toggle switch.
Both controls are available if the toggle switch is used. If a toggle switch
is used, it is wired as a discrete input to the GTX 345DR unit and it will
override the GDU button when switched on. The toggle switch should be guarded
to prevent accidentally enabling Emergency Mode.
The GDU button can control emergency mode while the toggle switch is switched
‘OFF’. The GTX 345DR automatically exits ‘Standby’ when the emergency mode is
activated. A command to put the GTX into ‘Standby’ will be ignored while
Emergency Mode is active.
ALTITUDE REPORTING
The Altitude Reporting button toggles Altitude Reporting On/Off. When
Altitude Reporting is ‘On’, altitude data is included in replies to Mode C and
S interrogations (when enabled) and ADS-B out squitters (when enabled). When
Altitude Reporting is ‘Off’, altitude data is not included in these
replies/squitters.
NOTE: For the GTX 345DR to transmit altitude in Mode C replies, Mode 3
must be set to ‘Normal’ (not ‘Standby’). The same is true for Mode S and ADS-B
transmissions; in addition, ADS-B Mode S Inhibit (Mode A/C Lock) must be
disabled and ADS-B Transmit (when control is present) must be enabled.
FUNCTION
Touching the Normal button allows for the normal operation of all enabled
modes. Touching the Standby button places the transponder in ‘Standby’
which disables all transponder RF transmit capability. The option to place the
transponder in ‘Standby’ is not available while in emergency mode.
MODE A/C LOCK
Touch the ADS-B/Mode S Inhibit button to inhibit all ADS-B out
transmissions, all replies to Mode S interrogations, and acquisition squitter
transmissions. The GTX 345DR reverts to ATCRBS (Air Traffic Control Radar
Beacon System) the only operation, therefore, it will continue to reply to
Mode 1/2 (if the extended modes feature is enabled), and Mode 3/A/C
interrogations regardless of aircraft air state.
The intent of this feature is to provide a means to inhibit all transmissions
that include aircraft identification (ICAO address, tail number, flight ID,
etc.) and position data. This feature does not prevent the aircraft from being
tracked as it will still reply to Mode 3/A/C
interrogations if Mode 3 is enabled.
ADS-B/Mode S Inhibit mode can be enabled by either control on the GDU or by a
separate toggle switch. Only one of these can be used in the installation. If
a toggle switch is used, it is wired as a discrete input to the GTX 345DR unit
and the GDU control does not appear. When the toggle switch is not used,
control and status are provided on the GDU. Also, when the toggle switch is
not used, the ADS-B TX button may be configured to appear on the Transponder
page for another level of control over 1090 ES transmissions, while not
inhibiting Model S.
The ‘NO MODE S TX’ and ‘NO ADS-B TX’ CAS messages are displayed when ADS-B /
Mode
S Inhibit is active. The ‘NO ADS-B TX’ CAS message is displayed when ADS-B TX
is disabled.
ADS-B TRANSMIT
The ADS-B Transmit button toggles ADS-B out On/Off. When disabled, 1090 ES
transmissions do not occur. When enabled, 1090 ES transmissions occur when the
unit is not in Standby, Mode 3 is enabled, and the Mode A/C Lock toggle switch
is set to ‘Disable’.
The ADS-B Transmit button is only available in installations that use an
external toggle switch to control Mode A/C Lock, or if the Mode A/C Lock
feature is not enabled. Otherwise, the ADS-B/Mode S Inhibit button is
displayed. In addition, the ADS-B Transmit button is only displayed if the
GTX is configured to allow pilot control of ADS-B out.
Garmin International, Inc.
1200 East 151st Street
Olathe, Kansas, 66062, U.S.A.
Garmin AT Inc.
2345 Turner Road SE
Salem, OR 97302, U.S.A.
Garmin (Europe) Ltd.
Liberty House, Hounsdown Business Park
Southampton, Hampshire SO40 9LR U.K.
Garmin Corporation
No. 68, Zhangshu 2nd Road
Xizhi District, New Taipei City, Taiwan
Contact Garmin Product Support at
www.flygarmin.com.
© 2021 Garmin Ltd. or its subsidiaries
190-02856-00 Rev. A
Documents / Resources
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GARMIN GTX 345DR G3X Touch
Pilot’s
[pdf] User Guide
G3X Touch Pilot s, GTX 345DR
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References
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