Gdu Communication - Garmin G1000 Maintenance Manual

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2.4.1 GDU Communication

HSDB
The GDU communicates directly with other GDUs and other LRUs via a High Speed Data Bus
(HSDB). These other LRUs include integrated avionics units, serial data concentrators, data link
receivers, and weather radars. In the G1000 System, the integrated avionics unit is the GIA
63/63W. The GIA 63/63W communicates with additional LRUs and discretes, concentrating
serial, analog, and discrete input and output data. This data provides a means for the GDU 1xxx
to communicate indirectly with additional LRUs. These indirect LRUs include audio panels,
engine acquisition units, and FADECs.
ARINC 429
The GDU communicates directly with other LRUs via ARINC 429. These LRUs include
Attitude and Heading Reference Systems (AHRS) and Air Data Computers (ADC).
RS-232
The GDU communicates directly with remote control units and provides debugging information
via RS-232.
Dimming
The GDU provides dimming of the displays and other integrated control/display LRUs (such as
the audio panels and remote controllers) via its monitoring of an aircraft dimming bus, through a
light detection sensor (photocell), or manually.
Uploading and Configuring Software
The GDU's SD Card slots are used to upload and configure software for the G1000. A software
loader card contains software files and configuration files. An SD card can also be used to
download maintenance data.
GDU Software
GDU software is uploaded into each GDU individually from a software loader card. GDUs are
configured in a similar manner as other LRUs. LRUs are uploaded with software after the GDU
software is loaded.
Databases
Certain databases are stored internally in each GDU. These databases include the basemap
database and the navigation database. Other databases are stored on a SD Card that remains
resident in the GDU. These databases include the terrain, obstacle, SafeTaxi, ChartView,
FliteCharts, and airport terrain databases. Each GDU retains its own copy of each database.
Some product features such as ChartView and TAWS require one-time activation via a uniquely
programmed SD card.
G1000 System Maintenance Manual Page 2-7
190-00903-00 Rev. A