Lynx NGT-9000s
Installation Manual
A.2.9 Discrete Input
The unit has 6 discrete inputs that are set to GND/Open. The GND position is typically (depending on
configuration options) the active (ON) position.
The discrete inputs provide 1.0 ± 0.25 ma of current when the input is grounded. The input is in the
ground state when input voltage is less than or equal to 3.5Vdc, or there is less than 10 Ohms impedance
to ground. The input is in the open state when the input voltage is greater than or equal to 18.0Vdc, or
there is greater than 100K Ohms impedance to ground. The discretes are dedicated or reserved as stated
below:
•
Discrete #1 is used for IDENT command which is used to signal the unit to identify itself with
IDENT signal. The discrete is set to GND/Open. The GND position indicates IDENT being
transmitted.
•
Discrete #2 is used for external Audio Mute which is used input to signal the unit to suppress all
audio output. The discrete is set to GND/Open. The active position mutes the audio.
•
Discrete #3 is used for On Ground status which used to determine whether ownship is in air or on
ground. The discrete is called Weight On Wheels (WOW) which can be connected to either a squat
switch, airspeed monitor, or a collective switch. The discrete can be set in the DCM settings to either
ground on ground, open on ground, or not used.
•
Discrete #4 is reserved
•
Discrete #5 is reserved
•
Discrete #6 is reserved
A.2.10 Discrete Output
The unit has 6 discrete outputs that are set to GND/Open.
The ground logic state has an output voltage of < 3.0Vdc when sinking 250mA of current. The open logic
state has an output impedance of > 100K ohms to ground for voltages applied to the output of 0.0 to
36.0Vdc.
The outputs have the capability of driving a Type 313 lamp. The lamp must have an initial resistance at
turn ON (cold) of 28Ω minimum and a steady state ON resistance of 280Ω minimum.
The discretes are dedicated or reserved as stated below:
•
Discrete #1 is reserved
•
Discrete #2 is reserved.
•
Discrete #3 is used for TAS Alert. The discrete is set to GND/Open. The active position indicates
Traffic Alert.
•
Discrete #4 is used for TIS-B Not In Coverage. The discrete is set to GND/Open.
•
Discrete #5 is reserved.
•
Discrete #6 is used for ADS-B Out Fail. The discrete is set to GND/Open.
Page A-6
Appendix A
0040-17001-01
January 15, 2015
Revision A
