190-01499-02
GTX 3X5 Transponder TSO Installation Manual
Rev. 4
Page 5-10
5.7.3
HSDB
Table 5-11 Ethernet Inputs and Outputs
5.7.4
RS-422
The RS-422 interface conforms to the electrical specifications of EIA standard RS-422.
Table 5-12 RS-422 Outputs
5.8
Suppression Bus
The EXTERNAL SUPPRESSION is intended for connection to other L-band equipment, such as a DME
or UAT. The output is active whenever the GTX 3X5 transmits. When driven by another source, the
GTX 3X5 transponder receiver and transmitter functions will be suppressed.
The EXTERNAL SUPPRESSION output is driven to
≥
18 VDC when the GTX 3X5 transmits. An input
voltage of
≥
10 VDC will suppress the GTX 3X5.
Table 5-13 External Suppression Bus Pin
5.9
OAT Input
The GTX 3X5 includes an OAT input, used for OAT and density altitude displays.
TEMP PROBE IN uses a current sensor type probe, such as the EDMO P/N 655-PROBE or the Davtron
P/N C307PS. The temperature input specification is 1 microamp per degree Kelvin (1uA/°K). Connect the
probe red wire to pin 25 and the black wire to pin 3.
Table 5-14 OAT Input and Output
Pin Name
Connector
Pin
I/O
ETHERNET OUT 1A
P3252
6
O
ETHERNET OUT 1B
P3252
1
O
ETHERNET IN 1A
P3252
7
I
ETHERNET IN 1B
P3252
2
I
ETHERNET OUT 2A
P3252
8
O
ETHERNET OUT 2B
P3252
3
O
ETHERNET IN 2A
P3252
9
I
ETHERNET IN 2B
P3252
4
I
Pin Name
Connector
Pin
I/O
RS-422 A
P3252
11
O
RS-422 B
P3252
12
O
Pin Name
Connector
Pin
I/O
EXTERNAL SUPPRESSION
P3251
18
I/O
Pin Name
Connector
Pin
I/O
TEMP PROBE OUT
P3251
25
O
TEMP PROBE IN
P3251
3
I
