Garmin GNS 480 Installation Manaul page 64

Installation Procedures
If the GNS 480 is setup to IGNORE the CDI select key and discrete input (refer to
3.2.1.6) this input will not be functional.
2.8.9.2 COM Flip-Flop Switch
P1-14 COM Flip Flop In
The COM Flip Flop In is used to toggle the active and standby COM frequencies. A momentary ground
on this input performs the same function as pressing the COM flip-flop soft key (↔) on the bezel.
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.
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NOTE
560-0982-01 Rev L GNS 480 (CNX80) Installation Manual