190-01115-01 G3X™/G3X Touch™ Avionics Installation Manual
Rev. AV Page 23-60
23.14.3.2 RS-485 Input
The GSU 25 contains one channel of RS-485 serial data communications for receiving data from the
GMU 22.
23.14.3.3 CAN Bus
This data bus conforms to the BOSCH standard for Controller Area Network 2.0-B. This bus complies
with ISO 11898. See Section 2.3.1.3
for details.
23.14.4 Temperature Inputs
Temperature input is used for Outside Air Temperature (OAT) computations. The temperature input is a
three-wire temperature probe interface. OAT Power Out and OAT High are connected internally at the
OAT probe. A GTP 59 or other supported temperature probe is required for the ADAHRS (GSU 25/73)
installation that is configured as ADAHRS 1. The GTP 59 is a Resistive Temperature Device (RTD). Refer
to Figure 18-2
for the temperature probe interconnect.
23.14.5 Unit ID
Refer to Figure 24-1.6
for connection drawing.
Pin Name Connector Pin I/O
RS-485 RX A J252 12 In
RS-485 RX B J252 13 In
Pin Name Connector Pin I/O
CAN BUS HI J251 1 I/O
CAN BUS LOW J251 2 --
Pin Name Connector Pin I/O
OAT POWER J252 1 Out
OAT HIGH J252 2 In
OAT LOW J252 3 In
Pin Name Connector Pin I/O
UNIT ID 1 GROUND J252 4 --
UNIT ID 1 J252 5 In
Unit ID Comment
ADAHRS #1 Leave pins 4 and 5 (of J252) unconnected
ADAHRS #2 Connect pin 4 (of J252) to pin 5 (of J252)
ADAHRS #3
Connect pin 4 (of J252) to pin 5 (of J252) and connect RS-232 RX 1 to RS-232 TX 1
(pins 4 and 5 on J251)
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