G900X/G950 Installation and Maintenance Manual – Pinouts
Page A-73
190-00719-00
Revision D
A.7.6 Serial
Data
The GTX 33 manages support for several equipment interfaces. The GTX 33 can be configured to
include GPS, Airdata, AHRS, EFIS/Airdata, and ADLP 429 inputs, functioning as an ARINC 429 data
concentrator.
The GTX 33 has four ARINC 429 input ports, making it capable of taking altitude, air data, heading,
EFIS selected course and possible future features, and then concentrating it on the ARINC 429 OUT 2
ports for possible data link applications.
The GTX 33 is designed to feed all outgoing data to the external display via RS-232 data ports.
A.7.6.1 RS-232
Pin Name
Connector
Pin
I/O
RS-232 OUT 1
P3301
23 Out
RS-232 IN 1
P3301
22 In
RS-232 OUT 2
P3301
25 Out
RS-232 IN 2
P3301
24 In
SIGNAL GROUND
P3301
51 --
SIGNAL GROUND
P3301
58 --
The RS-232 outputs conform to EIA Standard RS-232C with an output voltage swing of at least ±5 V
when driving a standard RS-232 load.
When connecting two GTX 33 transponders to a GPS, the unit can only receive RS-232 serial data from
one unit at a time. Use a DPDT switch for connecting both serial data and External Standby Select.
A.7.6.2 ARINC 429
Pin Name
Connector
Pin
I/O
ARINC 429 OUT 1A
P3301
37 Out
ARINC 429 OUT 1B
P3301
34 Out
ARINC 429 IN 1A
P3301
32 In
ARINC 429 IN 1B
P3301
35 In
ARINC 429 IN 2A
P3301
33 In
ARINC 429 IN 2B
P3301
36 In
ARINC 429 OUT 2A
P3301
30 Out
ARINC 429 OUT 2B
P3301
28 Out
ARINC 429 IN 3A
P3301
26 In
ARINC 429 IN 3B
P3301
29 In
ARINC 429 IN 4A
P3301
48 In
ARINC 429 IN 4B
P3301
49 In
SIGNAL GROUND
P3301
51 --
SIGNAL GROUND
P3301
58 --
The ARINC 429 outputs conform to ARINC 429 electrical specifications when loaded with up to five
standard ARINC 429 receivers.