Garmin GNS 480 Installation Manual page 55

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. If multiple resolvers are desired in the installation, the
primary unit must be installed and calibrated as described herein. The secondary unit
should use the composite output.
Refer to section 3.2.1.3 for information on calibrating the resolver input.
2.8.3 A
UXILIARY
The Auxiliary CDI output displays both lateral and vertical deviation from selected course, lateral and
vertical flags, and TO/FROM indications. This output is always based upon GPS information, regardless
of the navigation source that is selected for the Main CDI output using the CDI bezel key. Since the
Main CDI output can normally be switched between GPS and VOR/ILS, it is not necessary to use these
outputs to drive an indicator. It is only necessary if it is desired to have a separate indicator display GPS
deviation information full-time. This output does not provide superflag outputs, so if superflags are
required a converter box must be used to generate the required signals using the low-level valid flags.
Refer to Appendix D for interconnect information.
2.8.3.1 Deviation Outputs
P5-45 Aux CDI + Left
P5-46 Aux CDI + Right
P5-50 Aux GS + Up
P5-51 Aux GS + Down
Each deviation output provides 150 mV full scale and is capable of driving up to a 200 load, (i.e. up
to a maximum of five 1k loads connected in parallel).
2.8.3.2 TO / FROM Output
P5-47 Aux CDI + TO
P5-48 Aux CDI + FROM
The TO / FROM output provides 250 mV and is capable of driving up to a 200 load, (i.e. up to a
maximum of five 1k loads connected in parallel).
2.8.3.3 Flags
P5-49 Aux CDI + Valid
P5-54 Aux CDI - Valid
P5-52 Aux VDI + Valid
P5-55 Aux VDI - Valid
Each flag output provides +300 mV when valid information is present and is capable of driving up to a
200 load (i.e. up to a maximum of five 1k loads connected in parallel).
GNS 480 (CNX80) Installation Manual560-0982-01 Rev A
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Installation Procedures
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