Installation Procedures
GNS 480 (CNX80) Installation Manual
560-0982-01 Rev L
2-25
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 200
Ω
load, (i.e. up to a
maximum of five 1k
Ω
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 pr300 mV when valid information is present and is capable of driving up to a
200
Ω
load, (i.e. up to a maximum of five 1k
Ω
loads connected in parallel).
2.8.2.4
Superflags
P7-9
Main GS Superflag
P7-27
Main CDI Superflag
Each flag output provides (V
in
– 2) volts relative to ground when valid information is present, where V
in
.
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}
(COS input high)
P7-16
OBS_ F {S4}
(SIN input high)
P7-24
OBS_H {R HI}
(Reference output high)
P7-25
OBS_C {R LO}
(Reference output low)
P7-26
OBS_E {S3}
(COS input low)
P7-34
OBS_G {S2}
(SIN input low)
NOTE
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.
Summary of Contents for GNS 480
Page 1: ...GNS 480 CNX80 Color GPS NAV COM Installation Manual November 2008 560 0982 01 Rev L...
Page 10: ...Table of Contents viii 560 0982 01 Rev L GNS 480 CNX80 Installation Manual Notes...
Page 32: ...General Information 1 22 560 0982 01 Rev L GNS 480 CNX80 Installation Manual Notes...
Page 80: ...Installation Procedures 2 48 560 0982 01 Rev L GNS 480 CNX80 Installation Manual Notes...
Page 134: ...Periodic Maintenance 6 2 560 0982 01 Rev L GNS 480 CNX80 Installation Manual Notes...
Page 158: ...Appendix D Interconnect Diagrams D 2 560 0982 01 Rev L GNS 480 CNX80 Installation Manual Notes...
Page 192: ...D 36 560 0982 01 Rev Notes...
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