Figure 5-12 - View Of J251 Connector On The Gsu 25D; Figure 5-13 - View Of J252 Connector On The Gsu 25D; Table 5-15 - P251/J251 Pin Functions - Garmin G3X Touch Maintenance Manual

5.12.2 GSU 25D Aircraft Harness/LRU Connectors
This section describes the GSU 25D aircraft harness and interface connectors on the GSU. The GSU
connector designation is J251 and J252 and the aircraft harness connectors are designated as P251 and
P252 respectively.
5.12.2.1 Aircraft Harness Connector P251
The aircraft harness connector P251 is a 9-socket D-sub plug connector and interfaces to the J251
connector on the GSU. A pinout arrangement of J251 is shown in Figure 5-12 and connector pin functions
are shown in Table 5-15.
Pin
1
2
3
4
5
6
7
8
9
5.12.2.2 Aircraft Harness Connector P252
The aircraft harness connector P251 is a 15-socket D-sub plug connector and interfaces to the J251
connector on the GSU. A pinout arrangement of J251 is shown in Figure 5-13 and connector pin functions
are shown in Table 5-16.
Maintenance Manual
G3X Touch EFIS Part 23 AML STC
Figure 5-12 – View of J251 Connector on the GSU 25D
Table 5-15 – P251/J251 Pin Functions
Pin Name
CAN-H
CAN-L
RESERVED
RS-232 RX 1
RS-232 TX 1
POWER GROUND
AIRCRAFT POWER 1
AIRCRAFT POWER 2
RS-232 GROUND
Figure 5-13 – View of J252 Connector on the GSU 25D
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Revision 2