Garmin GNC 255 Installation Manual - page 48
GTR 225/GNC 255 TSO Installation Manual
190-01182-02
Page 5-10
Rev. B
5.2.5.5 COM REMOTE TUNE UP*
COM REMOTE TUNE UP* discrete input may be used to scroll through a list of preset COM frequencies.
A momentary low on this pin will load the next preset frequency in the list into the standby COM
frequency field.
5.2.5.6 COM REMOTE TUNE DOWN*
COM REMOTE TUNE DOWN* discrete input may be used to scroll through a list of preset COM
frequencies. A momentary low on this pin will load the previous preset frequency in the list into the
standby COM frequency field.
5.2.6 VOR/ILS Audio
500
VOR/LOC AUDIO OUT HI supplies 100 mW into a 500 load. It is a balanced output and the
500
VOR/LOC AUDIO OUT LO output must be connected.
5.2.7 VOR/ILS Discrete Inputs
This input is considered active if either the voltage to ground is ≤3.5 VDC or the resistance to ground is
≤375
. This input is considered inactive if the voltage to ground is 11-33 VDC or the resistance to ground
is >100k Ω.
An asterisk (*) following a signal name denotes that the signal is an Active-Low, requiring a ground to
activate.
5.2.7.1 VOR/LOC REMOTE TRANSFER*
VOR/LOC REMOTE TRANSFER* discrete input may be used to flip-flop between the active and standby
NAV frequencies. A momentary low on this pin will load the standby NAV frequency into the active NAV
frequency field.
Pin Name
Connector
Pin
I/O
500 Ω VOR/LOC AUDIO OUT HI
P2002
16
Out
500 Ω VOR/LOC AUDIO OUT LO
P2002
17
Out
Pin Name
Connector
Pin
I/O
VLOC REMOTE TRANSFER*
P2002
28
In