190-02207-A2
GPS 175/GNX 375/GNC 355 Part 23 AML STC Maintenance Manual
Rev. 3
Page 5-26
Table 5-5 J3751 Connector Pinout
Pin
Pin Name
I/O
Pin
Pin Name
I/O
1
PRESSURE SENSOR/CONFIG
MODULE(C)
--
32
ALTITUDE GRAY CODE
INPUT(A2)
IN
2
RESERVED
--
33
ALTITUDE GRAY CODE
INPUT(B2)
IN
3
OAT TEMP PROBE(I)
--
34
ALTITUDE GRAY CODE
INPUT(C2)
IN
4
TIME MARK A
OUT
35
RESERVED
--
5
RESERVED
--
36
EXT IDENT (DISCRETE IN 7)
IN
6
RESERVED
--
37
AUDIO MUTE (DISCRETE IN 9)
OUT
7
RS-232 #5 (T)
OUT
38
POWER CONTROL
--
8
RS-232 #4 (T)
OUT
39
SWITCHED POWER OUT
--
9
RS-232 #3 (T)
OUT
40
LIGHTING BUS(L)
IN
10
ALTITUDE GRAY CODE INPUT
(A1)
IN
41
POWER GND
--
11
ALTITUDE GRAY CODE INPUT
(B1)
IN
42
POWER INPUT 1
IN
12
ALTITUDE GRAY CODE INPUT
(C1)
IN
43
PRESSURE SENSOR/CONFIG
MODULE(V)
OUT
13
ALTITUDE GRAY CODE INPUT
(D4)
IN
44
RESERVED
--
14
EXT STANDBY (DISCRETE IN 6)
IN
45
RESERVED
--
15
DISCRETE I/O 1
I/O
46
AUDIO OUT
OUT
16
DISCRETE I/O 2
--
47
AUDIO GND
--
17
RESERVED
OUT
48
ARINC 429 IN 2 A
IN
18
EXT SUPPRESSION BUS
OUT
49
ARINC 429 IN 2 B
IN
19
LIGHTING BUS(H)
IN
50
RS-232 #5 (GND)
--
20
POWER GND
--
51
RS-232 #4 (GND)
--
21
POWER INPUT 1
IN
52
RS-232 #3 (GND)
--
22
PRESSURE SENSOR/CONFIG
MODULE(D)
I/O
53
ALTITUDE GRAY CODE
INPUT(A4)
IN
23
PRESSURE SENSOR/CONFIG
MODULE(GND)
OUT
54
ALTITUDE GRAY CODE
INPUT(B4)
IN
24
RESERVED
--
55
ALTITUDE GRAY CODE
INPUT(C4)
IN
25
OAT TEMP PROBE(O)
--
56
ALTITUDE GRAY CODE
INPUT(GND)
IN
26
TIME MARK B
OUT
57
AIR/GROUND (DISCRETE IN 8)
IN
27
ARINC 429 IN 1 A
IN
58
RESERVED
IN
28
ARINC 429 IN 1 B
IN
59
RESERVED
IN
29
RS-232 #5 (R)
IN
60
RESERVED
OUT
30
RS-232 #4 (R)
IN
61
POWER INPUT 2
IN
31
RS-232 #3 (R)
IN
62
POWER INPUT 2
--
