Garmin GNS 480 Installation Manaul page 57

2.8.2.2 TO / FROM Output
P7-11 Main CDI + FROM
P7-12 Main CDI + TO
The TO / FROM output provides ±250 mV and is capable of driving up to a 200Ω load, (i.e. up to a
maximum of five 1kΩ loads connected in parallel).
2.8.2.3 Flags
P7-10 Main CDI + Valid
P7-29 Main CDI - Valid
P7-28 Main GS + Valid
P7-32 Main GS - Valid
Each flag output provides +300 mV when valid information is present and is capable of driving up to a
200Ω load, (i.e. up to a maximum of five 1kΩ loads connected in parallel).
2.8.2.4 Superflags
P7-9 Main GS Superflag
P7-27 Main CDI Superflag
Each flag output provides (V
represents the aircraft power supplied to the GNS 480. Each output is capable of supplying up to 400 mA.
2.8.2.5 OBS Resolver
The OBS resolver input should be compatible with a standard 6-wire OBS interface -
any electrical zero crossing will work because the GNS 480 will calibrate out any errors.
P7-7 OBS_ D {S1}
P7-16 OBS_ F {S4}
P7-24 OBS_H {R HI}
P7-25 OBS_C {R LO}
P7-26 OBS_E {S3}
P7-34 OBS_G {S2}
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.
GNS 480 (CNX80) Installation Manual
– 2) volts relative to ground when valid information is present, where V
in
(COS input high)
(SIN input high)
(Reference output high)
(Reference output low)
(COS input low)
(SIN input low)
NOTE
560-0982-01 Rev L
Installation Procedures
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in
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