Garmin G1000 Manual page 18

SYSTEM OVERVIEW
• GMA 1347D Cabin – Integrates NAV/COM digital audio, intercom system and marker beacon controls, and
is installed in dual configuration on the outboard side of PFD1 and PFD2. This unit also enables the manual
control of the display reversionary mode (red DISPLAY BACKUP button) and communicates with the on-side
GIA 63W, using an RS-232 digital interface.
• GTX 33 and GTX 33D – Solid-state transponders that provide Modes A, C and S capability. The GTX 33D
includes Mode S with diversity and is indicated as 'XPDR1'. The GTX 33 is indicated as 'XPDR2'. Both
transponders can be controlled from either PFD, and only one transponder can be active at a time. Each
transponder communicates with the on-side GIA 63W through an RS-232 digital interface.
• GDL 69A – A satellite radio receiver that provides real-time weather information to the G1000 MFD (and,
indirectly, to the inset map of the PFD) as well as digital audio entertainment. The GDL 69A communicates
with the MFD via HSDB connection. A subscription to the SiriusXM Satellite Radio service is required to enable
the GDL 69A capability.
• GDR 66 – Provides Controller Pilot Data Link Communications (CPDLC) connectivity. GDR 66 operation is
performed with the MFD through the HSDB. Connectivity with the GDR 66 is through the RS-422 bus.
4 Garmin G1000 Pilot's Guide for the Socata TBM 850/900 190-00709-05 Rev. D