Pin #
Description
I/O
Notes
1
Aircraft Power 11-33Vdc
In
2
RS 232A (TCMD)
In
3
Serial Ground
In
4
RS232B (Altitude In)
In
9600 Baud
5
Aircraft Ground
In
6
External Ident
In
7
RS232A (TSTAT)
Out
8
RS232B (Altitude Out)
Out
9600/1200 Baud Selectable.
9600 Baud Factory Default
9
Supression
In
<.5V= Low, >1.8V=High)
Pin #
Description
I/O
Notes
1
Altitude D4
Out
2
Altitude A1
Out
3
Altitude A2
Out
4
Altitude A4
Out
5
Altitude B1
Out
6
Stobe
Out
**
7
Signal Ground
OAT Drain, Grey Code
8
Aircraft Power
Out
Non Switchable
9
Altitude B2
Out
10
Altitude B4
Out
11
Altitude C1
Out
12
Altitude C4
Out
13
Altitude C2
Out
14
OAT Power
Out
OAT Probe Power (Red Wire*)
15
OAT Signal
In
OAT Probe Signal (Black Wire*)
3.7
Connector Pin Out
3.7.1
STX 165 Panel Mounted Unit
J3
9 Pin Sub-D
J2
15 Pin Sub-D
16
306100-00
*OAT Probe wire colors
** Older transponders”Strobed” encoders whenever they wanted an altitude update.
This is not required in newer transponder systems. When the STX 165 altitude output
is being used by another sytem that does not require a strobe, a ground on the STX 165
Strobe line is usually required.
Summary of Contents for STX 165
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