190-01004-02
GTN 625/635/650 TSO Installation Manual
Rev. F
Page 5-19
5.2.9.1 OBS MODE SELECT*
The OBS MODE SELECT* discrete input may be used to toggle between GPS OBS and GPS AUTO
modes of operation. A momentary low on this pin performs the same function as pressing the ‘OBS’ key
on the GTN display.
5.2.9.2 AUDIO INHIBIT IN*
The AUDIO INHIBIT IN* discrete input may be used to suppress TAWS/HTAWS and touch screen
feedback audio from the GTN.
5.2.9.3 TAWS INHIBIT IN*
The TAWS INHIBIT IN* discrete input, when toggled momentarily low, may be used to inhibit TAWS/
HTAWS alerts from the GTN.
5.2.9.4 AIR/GROUND*
AIR/GROUND* discrete is an Active-Low, and can be configured to interpret if the aircraft is airborne or
on the ground based upon whether the input is grounded or open.
5.2.9.5 CDI SOURCE SELECT* (GTN 650 Only)
The CDI SOURCE SELECT* discrete input may be used to toggle between display of GPS and VOR/
LOC/Glideslope information on the MAIN external CDI/HSI. A momentary low on this pin performs the
same function as pressing the ‘CDI’ key on the GTN display.
5.2.9.6 DEMO MODE SELECT*
The DEMO MODE SELECT* discrete input may be used to select Demo Mode on the GTN. When this
pin is connected to ground during power up, the GTN starts up in Demo Mode. Demo Mode allows the
GTN to simulate reception of GPS satellite signals. Demo Mode can also be accessed by holding down the
D
key during power-up.
CAUTION
Do not connect DEMO MODE SELECT in an aircraft installation.
NOTE
Garmin has worked closely with Lone Star Aviation Corporation to ensure compatibility
of their Commander Docking Station which is designed to be used in Demo Mode. Contact
Lone Star Sales Department for more information at 682-518-8831.
5.2.9.7 SYSTEM ID PROGRAM*
The System ID PROGRAM* discrete input is used to identify the #2 unit in an installation with more than
one GTN. This input must be strapped to ground on the second GTN.
SYSTEM ID PROGRAM*
GTN Installation
Open
GTN #1 or single-GTN installation
Ground
GTN #2
Summary of Contents for GTN 625
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