190-01115-01 G3X™/G3X Touch™ Avionics Installation Manual
Rev. AV Page 23-5
23.1.4 Power
GAD 27 POWER IN (+14V only) is the GAD 27 unit power input and is internally diode OR’d with the
Keep Alive bus (TB273) to provide power redundancy.
23.1.5 CAN Bus
The CAN Bus conforms to the BOSCH standard for Controller Area Network 2.0-B, and complies with
ISO 11898. Pin 3 is used to terminate the CAN bus (only if a CAN termination adapter is not used as
shown in Section 2.3.1.3.3
). To terminate the CAN bus at the GAD 27 short the pins (2 and 3) together.
Refer to Section 2.3.1.3.2
for details on configuring and terminating the CAN bus. The CAN bus on J271
is used for communications between G3X LRUs.
23.1.6 Discrete Inputs
The GAD 27 has 9 discrete inputs that can be configured as Active Low or Active High. The GAD 27
discrete inputs conform to the following specification:
Low: Vin < 3.5 VDC, or Rin < 375 Ω
High: Vin > 8 VDC, or Rin > 100k Ω
Note that a floating (disconnected) input on Discrete Inputs 1-7 will be treated as High, while a floating
input on Discrete Inputs 8-9 will be treated as Low.
Pin Name Connector Pin I/O
GAD 27 POWER IN J271 7 In
GAD 27 POWER GND J271 8 --
Pin Name Connector Pin I/O
CAN HI J271 1 I/O
CAN LO J271 2 I/O
CAN TERMINATE J271 3 --
Pin Name Connector Pin I/O
DISCRETE IN 1 J271 9 In
DISCRETE IN 2 J271 10 In
DISCRETE IN 3 J271 11 In
DISCRETE IN 4 J271 12 In
DISCRETE IN 5 J271 13 In
DISCRETE IN 6 J271 14 In
DISCRETE IN 7 J271 15 In
DISCRETE IN 8 J271 48 In
DISCRETE IN 9 J271 49 In
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