air
avionics
3. Interfaces
3.7 Discrete Inputs
AT-1 features a range of discrete inputs. Active-Low discrete inputs are considered active if
either the voltage to ground is below a certain minimum or if the resistance to ground is
below approximately 300 Ohms.
These inputs can optionally be used together with switches or pushbuttons in the airframe
or instrument panel to trigger specific functions once the switch source is exercised:
Function Name
Description
Switch type
MUTE
The AT-1 audio output can be muted.
Toggle switch
NO ALARMS
Traffic warnings issued over the AT-1 data
Toggle switch
interfaces can be suppressed.
ON GND
In this case, the switch sets the aircraft’s
Airframe switch (WOW)
state as on-the-ground.
In approach mode, the warning sensitivity is
APPROACH MODE
reduced. This mode can be used during IFR
Toggle switch
approaches or while flying in close formations.
Acknowledges a voice message for 5 minutes,
VOICE ACK
e.g. a traffic warning from a specific traffic
Pushbutton
target.
We recommend installing the on-ground function only in combination with an airframe switch
(weight-on-wheel).
All switches must be clearly labeled for easy identification by the flight crew.
AT-1
·
Installation Manual
·
rev. 4.0
·
2020/01/09
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