Garmin Apollo CNX80, Installation Manual

Page: 61 / 168

Installation Procedures
Apollo CNX80 Installation Manual 560-0982-00 Rev D
2-31
2.8.9.3 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. A momentary
ground on this input performs the same function as pressing the VOR flip-flop soft key (
↔
) on the bezel.
2.8.9.4 Push to Talk (PTT)
P4-4 PTT
The PTT is used to transmit on the COM radio. A ground on this input enables the Com MIC audio and
causes the Com transceiver to transmit on the active frequency.
2.8.9.5 Com User List Switch
P1-15 UP Discrete In
P1-33 DOWN Discrete In
The Com User List inputs are momentary, active-low discrete inputs and are used to display the Com User
List and select a frequency. When not displayed, a momentary grounding on either of these inputs causes
the Com User List window to be displayed. When the Com User List window is displayed, a momentary
ground on the UP Discrete In (P1-15) causes the highlighted frequency to move up to the next frequency in
the list. A momentary ground on the DOWN Discrete In (P1-33) causes the highlighted frequency to move
down to the next frequency in the list. Once selected, the frequency can be made active by pressing the Com
Flip-Flop button.
2.8.9.6 Suspend Switch
P5-76 Suspend In
The Suspend In input suspends automatic sequencing of waypoints in the active flight plan. A momentary
ground on this input performs the same function as pressing the
SUSP
key on the CNX80 bezel.
2.8.9.7 Audio Inhibit In
P5-76 Audio Inhibit In
The Audio Inhibit In is used to inhibit the CNX80 audio messages. A ground on this input causes CNX80
audio messages not to be played; if this input is open CNX80 audio messages will be played. Any audio
messages that are inhibited because of this input will not be played when the audio inhibit condition is
removed.
NOTE
The Audio Inhibit input will not inhibit the momentary tone that is played by the CNX80
whenever a status message is available. This tone can be disabled by the user via the
system configuration page.