Garmin G3X Installation Manual page 19

1.3.2 Configuration Modules
The G3X system is designed to store configuration and calibration data in multiple locations to retain the
configuration of the system during maintenance. Figure 1-2 shows the configuration module that installs
on both the GDU 37X (PFD) and the GSU 73 connector backshell.
Figure 1-2. Configuration Module
1.3.2.1 GDU 37X PFD Configuration Module
The GDU 37X PFD uses a configuration module designated as the master system configuration module.
The master system configuration module stores configuration data identical to the PFD configuration data
stored in the PFD memory. The PFD cross-checks the configuration module data against internal PFD
memory and self-configures to match the master system configuration module. The PFD also maintains
control of the GSU 73 configuration and calibration settings except for GSU AHRS calibration settings
which are stored in the GSU configuration module.
1.3.2.2 GSU 73 Configuration Module
The GSU configuration module stores a duplicate copy of the AHRS/Magnetometer calibration values
which are recorded upon completion of post-installation calibration procedures. The GSU configuration
module also provides a reference temperature measurement which is used for calculating thermocouple
temperatures. All thermocouple temperature readouts will be red-x'd if the GSU configuration module is
not present.
G3X Installation Manual – Installation Overview Page 1-3
190-01115-01 Revision E