190-01115-01 G3X™/G3X Touch™ Avionics Installation Manual
Rev. AV Page 23-28
23.4.5 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 Appendix H.4.19.3.2
for
configuration)
.
23.4.6 CAN Bus
All 3 data buses conform to the BOSCH standard for Controller Area Network 2.0-B. The busses comply
with ISO 11898. Refer to Section 2.3.1.3.3
for details on configuring and terminating the CAN bus. The
CAN bus on J241 shall be used for communications between G3X LRUs. The FADEC CAN2 and FADEC
CAN3 (GEA 24B only) bus connections on J244 shall be used to communicate with FADEC engine
controllers and shall not be connected to other G3X LRUs. The FADEC CAN2 and FADEC CAN3 buses
are not terminated at the unit, refer to the interconnect diagrams for how to terminate the FADEC CAN2
and FADEC CAN3 buses if used. Using the FADEC CAN3 input provides for greater system redundancy
in the case of an ECU lane failure.
23.4.7 RS-232
The RS-232 channel can optionally be connected to a GDU display to provide a redundant path for EIS
data.
Pin Name Connector Pin I/O
AIRCRAFT POWER 1 J241 7 In
AIRCRAFT POWER 2 J241 8 In
GROUND J241 6 --
GROUND J241 9 --
Pin Name Connector Pin I/O
CAN HI J241 1 I/O
CAN LO J241 2 I/O
FADEC_CAN2_HI J244 17 I/O
FADEC_CAN2 LO J244 33 I/O
FADEC_CAN3_HI (GEA 24B ONLY, 010-02770-00) J244 48 I/O
FADEC_CAN3 LO (GEA 24B ONLY, 010-02770-00) J244 49 I/O
Pin Name Connector Pin I/O
RS-232 RX J241 4 In
RS-232 TX J241 5 Out
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