Garmin G3X Installation Manual page 370

23.16.5 Serial Data Electrical Characteristics
23.16.5.1 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
interconnect.
RS-232 OUT 1
RS-232 GROUND 1
RS-232 IN 1
RS-232 OUT 2
RS-232 IN 2
RS-232 GROUND 2
23.16.5.2 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.
ARINC 429 OUT 1A
ARINC 429 OUT 1B
ARINC 429 OUT 2A
ARINC 429 OUT 2B
SIGNAL GROUND
SIGNAL GROUND
190-01115-01
Rev. AA
Pin Name
Pin Name
G3X/G3X Touch Installation Manual - LRU Pinouts
Section 24 for the RS-232 serial data
Connector
J2301
J2301
J2301
J2301
J2301
J2301
Connector
J2301
J2301
J2301
J2301
J2301
J2301
Pin I/O
23 Out
43 --
22 In
25 Out
24 In
50 --
Pin I/O
37 Out
34 Out
30 Out
28 Out
51 --
58 --
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