Figure 3-5. Resolverc - Garmin GNS 480 Installation Manaul

The GNS 480 cannot drive multiple resolvers at the same time. It is not recommended that external
resolvers be switched through a relay or other means because the resolver must be calibrated to the radio
as described in this procedure. If multiple resolvers are desired in the installation, the primary unit must be
installed and calibrated as described here. The secondary unit should use the composite output.
The composite output is limited to the VHF NAV signal and will not be switched to GPS
when the CDI bezel key is pressed.
3.2.1.4 Baro Interface
The Baro Interface function lets you to select whether or not a baro-correction potentiometer is installed,
and allows an installed potentiometer to be calibrated. It also provides an option to disregard the baro
correction and baro-corrected altitude from an FADC, which may be desirable in certain installations.
While on the Ground Maintenance SETUP menu page, press the BARO line select key. Press the top line
select key to toggle between INSTALLED (for installations with a baro pot) or NOT INSTALLED (for
installations without a baro pot). Press the FADC line select key to toggle between USE (for installations
where the baro data from the FADC will be used) or IGNORE (for installations where the baro data from
the FADC will not be used). The Baro Interface setup page is shown in Figure 3-6.
Due to priorities of incoming data (refer to 2.5.2.3), the FADC baro data will be used
before that of the MX20/GMX 200. If it is desired not to use the baro-correction feature
of the FADC source, the FADC BARO/ALT setting should be set to IGNORE.
The units that are used may be set using the UNITS line select key to toggle the units between inches Hg
and millibars.
Changing the units will only affect the units displayed during calibration. The user can
change the units that are displayed during normal operation via the system configuration
page.
GNS 480 (CNX80) Installation Manual
Figure 3-5. Resolver Calibration Page
NOTE
NOTE
NOTE
560-0982-01 Rev L
Post-Installation Configuration & Checkout
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