Connector Pinout Information
190-01499-02
GTX 3X5 Transponder TSO Installation Manual
Rev. 9
Page 5-2
5.1
Main Board Connector - J3251
Table 5-1 J3251 Connector
Pin
Pin Name
I/O
1
ALT ENCODER/CONFIG MODULE CLOCK
I/O
2
USB DATA HI
I/O
3
TEMP PROBE IN
I
4
TIME MARK A
O
5
ARINC 429 OUT A
O
6
ARINC 429 OUT B
O
7
RS-232 OUT 3
O
8
RS-232 OUT 2
O
9
RS-232 OUT 1
O
10
ALTITUDE A1* or CONFIGURABLE*
I
11
ALTITUDE B1* or CONFIGURABLE*
I
12
ALTITUDE C1* or CONFIGURABLE*
I
13
ALTITUDE D4* or CONFIGURABLE*
I
14
EXTERNAL STANDBY SELECT* or CONFIGURABLE*
I
15
CONFIGURABLE DISCRETE 1*
I/O
16
CONFIGURABLE DISCRETE 2*
I/O
17
XPDR FAIL 1* or CONFIGURABLE*
O
18
EXTERNAL SUPPRESSION
I/O
I/O
C4
B1
A1
I
B
A
O
C1
I/O
+
H
I/O
B2
A2
I
R
B
D4
C2
O
+
L
21
42
Ext I
d
en
t
In
p
ut
(7)
Air /
Gro
und In
put
(8)
Ext
Sta
ndby I
npu
t (6)
Li
g
h
ting B
u
s
Ext
Sup
p
re
ssion
Bus
Swi
tch
ed
Powe
r Out
P
ow
e
r C
onf
ig
R
e
serv
ed
A
lti
tu
de G
ray
C
ode I
nput
Power I
nput
1
Pow
e
r Gro
und
A
T
A
D-
Ground
R
S-232
#3
D
iscret
e
I/O 1
(1
)
OAT Temp Probe
R
S-232
#2
Keep A
liv
e
+
+
I
I
I
62
B4
A4
I
B
A
Pre
ssu
re Sensor
/
C
onf
ig Mod
ule
22
43
1
D+
I
O
I
C
I
T
O
I
D
V+
T
R
V
US
B
R
S-232
#1
B
Aud
io M
u
te
Input
(9)
Di
scr
ete
Inp
u
t (
10)
D
iscret
e
I/O 2
(2
)
P
ow
e
r In
pu
t 2
P
o
w
e
r Con
tro
l
D
iscret
e
O
utp
ut
(3
)
R
Time
M
ark A
AR
IN
C
429 TX
AR
INC 429
R
X
2
Au
dio
Ou
tp
ut
AR
IN
C
429 RX1
Numbers in ( ) are the discrete I/O numbers.
VIEW IS LOOKING AT THE BACK
OF THE UNIT
