Discrete Outputs - Garmin GTN 635 Installation Manual

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.
Do not connect DEMO MODE SELECT in an aircraft installation.
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*
Open
Ground

5.2.10 Discrete Outputs

OBS ANNUNCIATE*
GPS ANNUNCIATE*
WAYPOINT ANNUNCIATE*
TERMINAL ANNUNCIATE*
TAWS AUDIO ACTIVE OUT
VLOC ANNUNCIATE*
LOI ANNUNCIATE*
MESSAGE ANNUNCIATE*
APPROACH ANNUNCIATE*
ILS/GPS APPROACH*
TAWS INHIBIT ANNUNCIATE*
TERRAIN WARNING ANNUNCIATE*
TERRAIN NOT AVAILABLE ANNUNCIATE*
TERRAIN CAUTION ANNUNCIATE*
GPS SELECT* [1]
TRAFFIC TEST*
TRAFFIC STANDBY*
SPARE DISC OUT A*
SPARE DISC OUT B*
[1] The operation of the GPS SELECT can be configured.
An asterisk (*) following a signal name denotes that the signal is Active-Low, producing a low (ground)
on the output when active.
All discrete outputs from the GTN are Active-Low. Each is an ―open drain‖ output capable of sinking 500
mA when active.
GTN 625/635/650 TSO Installation Manual
190-01004-02
CAUTION
NOTE
Pin Name
GTN Installation
GTN #1 or single-GTN installation
GTN #2
Connector
P1001
P1001
P1001
P1001
P1001
P1001
P1001
P1001
P1001
P1001
P1001
P1001
P1001
P1001
P1001
P1001
P1001
P1002
P1002
Pin I/O
14 Out
15 Out
33 Out
34 Out
35 Out
52 Out
53 Out
54 Out
55 Out
56 Out
57 Out
71 Out
72 Out
73 Out
74 Out
75 Out
76 Out
3 Out
12 Out
Page 5-15
Rev. C