Garmin G3X Installation Manual page 189

A.2 GMU 44
A.2.1 P441 Connector
Figure A-2. View of J441 Connector Looking at Rear of Unit
Pin Pin Name
1 SIGNAL GROUND
2 RS-485 OUT B
3 SIGNAL GROUND
4 RS-485 OUT A
5 SPARE
6 POWER GROUND
7 SPARE
8 RS-232 IN
9 +12 VDC POWER
A.2.2 Power Function
Power-input pins accept supply voltage from GSU 73.
Pin Name
+12 VDC POWER, GMU 44
POWER GROUND, GMU 44
A.2.3 Serial Data
A.2.3.1 RS-232
Pin Name
RS-232 IN
A.2.3.2 RS-485
Pin Name
RS-485 OUT A
RS-485 OUT B
G3X Installation Manual – Pinouts
190-01115-01
Connector Pin
P441 9
P441 6
Connector Pin
P441 8
Connector Pin
P441 4
P441 2
I/O
--
Out
--
Out
--
--
--
In
In
I/O
In
--
I/O
In
I/O
Out
Out
Page A-5
Revision E