Databus Wiring - New Installations; Circuit Protection; Power Distribution - Avidyne IFD540 Installation Manual

Installations with significant amount of Byteflight data interruptions should consider
installing Byteflight cable.
4.7.2 Databus Wiring – New Installations
For all new installations of dual IFDs (not replacing pre-existing GNS4xx/5xx systems), the
recommended wiring for the RS-485 data protocol is shielded twisted- pair cable with an
approximate characteristic impedance of 100-120 Ohms. The wire material must meet 14 CFR
23.1359 (c).

4.8 Circuit Protection

Circuit Breakers must be installed in a location easily accessible to the pilot and must be
resettable trip free devices. The Circuit Breaker must be clearly identified and visible under
all lighting conditions. Circuit breaker size is identified in installation data shown in
Appendix D: Electrical Interface Drawings. Note that 14v aircraft may be required to replace
the installed circuit breaker and power wiring to accommodate the IFD5XX.

4.9 Power Distribution

Aircraft installing one IFD5XX should connect the power and grounds as shown in Figure 4.
Aircraft with a maximum certified gross takeoff weight less than 6000 pounds must connect
the dual IFD5XX as shown in Figure 5.
600-00299-000
Single Avionics Bus
Avionics Bus
IFD540 COM
Aircraft Ground
Figure 4: IFD5XX Power Distribution
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IFD5XX Installation Manual
Revision: 02