Garmin G3X Installation Manual page 323

23.5.5 Aircraft Power
The GEA 24 has two pins for aircraft power inputs of 14/28 Vdc, and can operate using power from one or
both inputs (AIRCRAFT POWER 1 AND AIRCRAFT POWER 2). The pins are internally connected
using diodes to prevent current from flowing between the two power inputs. AIRCRAFT POWER 2 is for
connecting to an alternate power source, such as on aircraft with two electrical buses. The two aircraft
power inputs may optionally be used to monitor aircraft bus voltage (see
.
configuration)
AIRCRAFT POWER 1
AIRCRAFT POWER 2
GROUND
GROUND
23.5.6 CAN Bus
Both data buses conform to the BOSCH standard for Controller Area Network 2.0-B. The busses comply
with ISO 11898. Refer to
CAN bus on J241 shall be used for communications between G3X LRUs. The CAN 2 bus on J244 shall be
used to communicate with FADEC engine controllers and shall not be connected to other G3X LRUs. The
CAN2 bus is not terminated at the unit, refer to the wiring diagrams for how to terminate the second CAN
bus if used.
CAN HI
CAN LO
CAN2_HI
CAN2 LO
23.5.7 RS-232
The RS-232 channel can optionally be connected to a GDU display to provide a redundant path for EIS
data.
RS-232 RX
RS-232 TX
190-01115-01
Rev. AA
Pin Name
Section 2.3.1.3.3 for details on configuring and terminating the CAN bus. The
Pin Name
Pin Name
Section 28.4.17.3.2
Connector
J241
J241
J241
J241
Connector
J241
J241
J244
J244
G3X/G3X Touch Installation Manual - LRU Pinouts
for
Pin
7
8
6
9
Pin
1
2
17
33
Connector Pin
J241 4
J241 5
Page 23-32
I/O
In
In
--
--
I/O
I/O
I/O
I/O
I/O
I/O
In
Out