Garmin G1000 NXi Pilot's Manual page 16

SYSTEM OVERVIEW
• GEA 71 (1) – Receives and processes signals from the engine and airframe sensors. This unit communicates
with both GIA 63Ws using an RS-485 digital interface.
• GMU 44 (1) – Measures local magnetic field. Data is sent to the GRS unit for processing to determine aircraft
magnetic heading. The GMU 44 receives power directly from the GRS unit and communicates with the
GRS unit using an RS-485 digital interface.
• GMA 1347 (1) – Integrates NAV/COM digital audio, intercom system and marker beacon controls. This
unit also enables the manual control of the display reversionary mode (red DISPLAY BACKUP button) and
communicates with the #1 GIA 63(W), using an RS-232 digital interface.
• GTX 335R/345R/33ES (1) – Solid-state transponder that provides Mode A, C, S capability. The optional
GTX 345R also provides ADS-B In/Out. The transponder can be controlled from the PFD. The transponder
communicates with the both GIA 63Ws through an RS-232 digital interface.
• GSA 81 (3), and GSM 86 (3) – The GSA 81 servos are used for the automatic control of roll, pitch, and pitch
trim. These units interface with each GIA 63W.
The GSM 86 servo gearbox is responsible for transferring the output torque of the GSA 81 servo actuator to
the mechanical flight-control surface linkage.
• GDL 69A / GDL 69A SXM (1) (Optional) – A satellite radio receiver that provides data link weather information
to the MFD (and, indirectly, to the PFD maps) as well as digital audio entertainment. The GDL 69A SXM
communicates with the MFD via HSDB connection. Subscriptions to the SiriusXM Weather or SiriusXM
Satellite Radio services are required to enable the GDL 69A SXM capability.
• GTS 800 (Optional) – The GTS 800 Traffic Advisory System (TAS) uses active interrogations of Mode S and
Mode C transponders to provide Traffic Advisories to the pilot independent of the air traffic control system.
Figure 1-1 shows interactions between the LRUs. Additional/optional equipment are also shown in Figure
1-1. The system is capable of interfacing with the following optional equipment:
• GDL 69A / GDL 69A SXM Data Link Receiver
• GTS 800 Traffic Advisory System
• L3 Stormscope Lightning Strike and Thunderstorm
Detection
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Garmin G1000 NXi Pilot's Guide for Cessna Nav III
• KN 63 DME
• KR 87 ADF Receiver
• KTA 870 Traffic Avoidance System
• CO Guardian Carbon Monoxide Detection
190-02177-00 Rev. A