190-01115-01 G3X™/G3X Touch™ Avionics Installation Manual
Rev. AV Page 2-21
Figure 2-3 shows the Apple® iOS compatible configuration module that installs on the GDU 4XX (PFD 1)
connector backshell. This configuration module is required for using Connext capability with Apple
products. Contact Garmin Aviation Product Support if the GDU 4XX unit was sold with an original green
configuration module. See Section 22
for installation instructions.
NOTE
Please refer to the G3X Touch Pilot’s Guide (190-01754-00) for guidance in using
Connext Bluetooth connections to Garmin Pilot device(s).
To test for the installation of the Apple iOS compatible configuration module, enter config mode, select the
System Information page, highlight PFD1, press Menu, and run the Apple compatibility test.
Figure 2-3 Apple iOS Compatible Black Configuration Module P/N 010-12253-00
2.3.1.3 CAN Bus
The primary digital interface used to exchange data between LRUs in the G3X system is the Controller
Area Network, also known as the CAN bus. CAN was developed by Bosch GmbH in the 1980s, and its
specifications are currently governed by ISO 11898-2. CAN is widely used in aviation, automotive, and
industrial applications due to its simplicity and reliability.
2.3.1.3.1 CAN Bus Architecture
The electrical architecture of the CAN bus takes the form of a linear “backbone” consisting of a single
twisted wire pair with an LRU connected (terminated) at each end (Figure 2-4). The overall length of the
CAN bus from end to end should be 20 meters (66 feet) or less. At each of the two extreme ends of the
CAN bus, a 120 Ω resistor is installed to “terminate” the bus. In the G3X system, termination resistors are
provided either within the LRUs themselves, or using termination adapters that plug into an LRUs CAN
connection (see Section 2.3.1.3.3
).
Figure 2-4 CAN Bus Backbone
LRU
LRU
TERMINATION CONNECTIONS
CAN BUS BACKBONE: CONSISTS OF TWISTED, SHIELDED PAIR
WIRING CONNECTED TO CAN HI AND CAN LO OF EACH LRU, AND
PROPERLY TERMINATED LRUs ON BOTH ENDS OF BUS.
TERM
TERM
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