G900X/G950 Installation and Maintenance Manual – Pinouts
Page A-75
190-00719-00
Revision D
A.8 GCU 476 (optional)
A.8.1 P4751
Connector
View of J4751 connector from back of unit
Pin Pin
Name
I/O
1
RS-232 OUT 1
Out
2
RS-232 IN 1
In
3
RS-232 OUT 2
Out
4
RS-232 IN 2
In
5 POWER
GROUND
--
6 SIGNAL
GROUND
--
7 AIRCRAFT
POWER
1
In
8 SIGNAL
GROUND
--
9 AIRCRAFT
POWER
2
In
10
CONTROL UNIT REMOTE POWER OFF
In
11 LIGHTING
BUS
HI
In
12 LIGHTING
BUS
LO
In
13 RESERVED
--
14 RESERVED
--
15 POWER
GROUND
--
A.8.2 Power
Pin Name
Connector
Pin
I/O
AIRCRAFT POWER 1
P4751
7
In
AIRCRAFT POWER 2
P4751
9
In
POWER GROUND
P4751
5
--
POWER GROUND
P4751
15
--
SIGNAL GROUND
P4751
6
--
SIGNAL GROUND
P4751
8
--
AIRCRAFT POWER 1 and AIRCRAFT POWER 2 are “diode ORed” to provide power redundancy.
A.8.2.1 Remote Power Off
Pin Name
Connector
Pin
I/O
CONTROL UNIT REMOTE POWER OFF
P4751
10
In
This input is used to power down the GCU 476, by a remote source. An input voltage between 6.5 VDC
and 33 VDC will power-off the GCU 476. An input voltage of 3.5 VDC or less will allow the GCU 476
to power on.