Installation Manual
Installation
560-0405-00 Rev –
December 14, 2001
Page 27
© 2001 by UPS Aviation Technologies Inc.
This input is a discrete input as defined in 3.5.1.1.
3.5.6
Standby Input
The standby discrete input is used to place the transponder in either the standby or ac-
tive modes and is normally connected to the transponder control panel. In the standby
mode, the transponder will not respond to any interrogations or generate squitters.
BITE will continue to operate in the standby mode. In the active mode, the trans-
ponder will respond to valid interrogations and generate squitters.
Ground ..................standby
Open......................active
This input is a discrete input as defined in 3.5.1.1.
3.5.7
Air/Ground Discrete Inputs
The air/ground discrete inputs are used by the transponder to determine air / ground
status of the aircraft. This is used to control or inhibit replies and to indicate whether
the aircraft is on the ground or airborne for Mode S replies.
3.5.7.1
Air/Ground #1
This input is used to not inhibit ATCRBS replies when on the ground, and is typically
used for ramp test functions so that the transponder can reply to all types of interroga-
tions.
Ground ..................aircraft on the ground
Open......................aircraft airborne
This input is a discrete input as defined in 3.5.1.1.
3.5.7.2
Air/Ground #2
This input is used to indicate that the aircraft is on the ground, and is normally con-
nected to the air/ground switch. When on the ground, the transponder will inhibit re-
plies to ATCRBS interrogations.
Ground ..................aircraft on the ground
Open......................aircraft airborne
This input is a discrete input as defined in 3.5.1.1.
3.5.8
Functional Test Discrete Input
The functional test input is used to place the transponder in a functional test mode.
Ground ..................enable functional test
Open......................normal operation
This input is a discrete input as defined in 3.5.1.1.
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