Garmin GNS 480, Installation Manual

Page: 69 / 186

Installation Procedures
GNS 480 (CNX80) Installation Manual560-0982-01 Rev A 2-39
2.8.13.1 Nav Audio Out
P7-23 NAV Audio Out
P7-20 NAV Audio Ground
The NAV Audio Out is a low-level audio output that is intended to drive a headset or audio panel. This
output will provide 100 mW into a 500
Ω
load.
2.8.13.2 VOR Flip-Flop Switch
P1-34 VOR Flip Flop In
The VOR Flip Flop In is used to toggle the active and standby VOR/LOC frequencies. Refer to section
2.8.9.3 for additional details.
2.8.14 M
ESSAGE
A
UDIO
The GNS 480 provides a message audio output for aural advisory messages. This output also provides an
optional tone to alert the user when a new status message is available. A discrete input is also provided
to allow these audio messages to be inhibited by higher priority systems.
Refer to Appendix D for interconnect information.
2.8.14.1 Message Audio Out
P5-40 Message Audio Out
P5-43 Message Audio Gnd
The Message Audio Out is a low-level audio output that is intended to drive a headset or audio panel. It
is recommended that this input be provided to an auxiliary input in the audio panel that will allow the
user to switch off the message audio if desired. This output will provide 100 mW into a 500
Ω
load.
2.8.14.2 Audio Inhibit In
P5-76 Audio Inhibit In
The Audio Inhibit In may be used by higher priority systems to inhibit the GNS 480 audio messages.
Refer to section 2.8.9.7 for additional details.
2.8.15 RMI / OBI
The GNS 480 RMI/OBI output can be used to drive an RMI (or OBI) navigation indicator. The OBI
Select input is used to select the source (GPS or Nav radio) used to provide the bearing.
Refer to Appendix D for interconnect information.