190-01115-01
G3X/G3X Touch Installation Manual - LRU Pinouts
Rev. AC
Page 25-80
25.17.5 Serial Data Electrical Characteristics
25.17.5.1 RS-232 Input/Output
RS-232 input channel 1 is used to receive pressure altitude and control commands, and to provide status,
TIS-A traffic, and other data. RS-232 output channel 1 provides unit status and TIS data. RS-232 channel
1 input and output are also used for software upgrades. RS-232 port channel 1 on the GTX should be
connected to the channel 1 RS-232 port on ADAHRS 1.
For installations that enable ADS-B, RS-232 input channel 2 should be connected to a GNS 400W/500W-
series WAAS enabled unit or a GTN 6XX/7XX series unit. This connection provides the GTX 23 with
GPS data for ADS-B. The RS-232 output channel 2 is unused on the GTX 23.
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. Refer to figures in
for the RS-232 serial data
interconnect.
25.17.5.2 ARINC 429 Input/Output
The ARINC 429 outputs conform to ARINC 429 electrical specifications when loaded with up to five
standard ARINC 429 receivers.
ARINC 429 Out Channel 1 is configured for low-speed TIS-A data, and ARINC 429 Out Channel 2 is
configured for high-speed TIS-A data for a GNS 4XX/5XX unit.
Pin Name
Connector
Pin
I/O
RS-232 OUT 1
J2301
23
Out
RS-232 GROUND 1
J2301
43
--
RS-232 IN 1
J2301
22
In
RS-232 OUT 2
J2301
25
Out
RS-232 IN 2
J2301
24
In
RS-232 GROUND 2
J2301
50
--
Pin Name
Connector
Pin
I/O
ARINC 429 OUT 1A
J2301
37
Out
ARINC 429 OUT 1B
J2301
34
Out
ARINC 429 OUT 2A
J2301
30
Out
ARINC 429 OUT 2B
J2301
28
Out
SIGNAL GROUND
J2301
51
--
SIGNAL GROUND
J2301
58
--
