Functional Descriptions 2.8.1 Power; Main Course Deviation - Garmin GNS 480 Installation Manual

2.8 F
UNCTIONAL
2.8.1 P
OWER
Aircraft power is provided to the GNS 480 on several connectors. The GNS 480 will accept input power
from 10 to 36 VDC.
P1-1 Power + (Primary)
P1-16 Power + (Primary)
P1-35 Power + Out (Nav)
P4-1 Power + (Com transceiver)
P7-1 Power + (Nav receiver)
P1-2 Power Ground (Primary)
P1-20 Power Ground (Primary)
P1-37 Power Gnd Out (Nav)
P4-9 Power Ground (Com transceiver)
P7-2 Power Ground (Nav receiver)
Two sets of primary power and ground pins are provided on P1. Both sets MUST
be connected to the aircraft power source or damage to the unit may occur.
Refer to Appendix D for recommended power connections.
2.8.2 M C
AIN OURSE
The Main CDI output displays both lateral and vertical deviation from selected course, lateral and
vertical flags and superflags, and TO/FROM indications.
The CDI key on the bezel of the GNS 480 is used to toggle between the display of GPS and VOR/ILS
information on the CDI window and remote CDI. The navigation source is displayed in the CDI window.
The navigation source can optionally be annunciated externally by connecting the GPS Indicator output
(P7-17) and NAV Indicator output (P7-18). The selection of GPS or VOR/ILS navigation sources may be
toggled remotely by momentarily grounding the CDI Select input (P7-8) is (refer to section 2.8.4 for
additional information on the external annunciators and switches).
If the GNS 480 is setup to IGNORE the CDI select key and discrete input (refer to
3.2.1.6), the Main CDI output will always be based on VOR/ILS information, even
though GPS information will be displayed in the CDI window and 'GPS' will be
annunciated beside the CDI key.
Refer to Appendix D for interconnect information.
GNS 480 (CNX80) Installation Manual560-0982-01 Rev A
D
ESCRIPTIONS
CAUTION
D I
EVIATION NDICATOR
NOTE
Installation Procedures
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