Garmin G3X Installation Manual page 315

Configure the GDU 45X/46X units per the following tables.
A GDU 45X/46X can be manually placed in reversionary mode by wiring Pin 25 to a two pole switch that
toggles between open and ground. When the switch is open, the display will operate normally. When the
switch is grounded, the display changes to reversionary mode, showing the engine bar at the top of the
display and a split screen PFD and MFD below. Other displays in the system will not be affected by
manually placing a display into reversionary mode.
Do not connect a switch to ground for pins 9 or 10, doing so can cause communication errors.
Grounding pin 42 will place the GDU 45X/46X in Demo mode, which is for in-store demonstration use
only, never ground pin 42 in an aircraft installation.
CDU SYSTEM ID
PROGRAM* 1,
P4502/4602 Pin 10
Open
Ground
Open
Ground
CDU SYSTEM ID
PROGRAM* 3
P4502/4602 Pin 25
Open
Ground
23.4.7 Configuration Module
Connect the configuration module to the PFD1 unit; do not connect a config module to PFD2, MFD1 or
MFD2.
CONFIG MODULE POWER OUT (3.3V, very low current)
CONFIG MODULE CLOCK
CONFIG MODULE GROUND
CONFIG MODULE DATA
190-01115-01
Rev. AA
CDU SYSTEM ID
PROGRAM* 2,
P4502/4602 Pin 9
GDU Mode
Auto Reversionary
Forced Reversionary
Pin Name
Open
Open
Ground
Ground
CDU SYSTEM ID
PROGRAM* 4
P4502/4602 Pin 42
Open
Ground
Connector
P4502/4602
P4502/4602
P4502/4602
P4502/4602
G3X/G3X Touch Installation Manual - LRU Pinouts
GDU Mode
MFD1
PFD1
PFD2
MFD2
GDU Mode
Normal Operation
Demo Mode
Pin I/O
17 Out
33 I/O
49 --
50 I/O
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