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
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