Installation Manual

Lynx NGT-9000
Installation Manual
0040-17001-01 (Revision W) Appendix A Page A-7
A.2.9 Discrete Input
The unit has six discrete inputs that are GND/Open. The GND position is typically (depending on
configuration options) the active (ON) position.
This discrete input provides 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 if the input voltage is greater than or equal to 18.0Vdc, or there
is greater than 100K Ohms impedance to ground.
• Discrete #1 (pin 27) is used to activate the IDENT pulse, which highlights the aircraft’s symbol on
the ATC’s radar screen and is identified on the Lynx NGT-9000 or external display / control panel
when active.
• Discrete #2 (pin 28) is used to mute all audio outputs coming from the Lynx NGT-9000. Audio mute
can be connected to other CAWS alerting systems if required (i.e. TAWS) that needs to mute the
traffic system for a higher priority audio annunciation.
• Discrete #3 (pin 29) is used to signal the Lynx NGT-9000 that the aircraft is on ground. The input
can be connected to 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 (pin 30) is used to cancel the audio from a TAWS or Traffic Aural. This Audio
Acknowledge discrete is used only when the optional TAWS, TAS, TCAS, or ATAS functionality is
configured.
• Discrete #5 (pin 31) is reserved. Release 3.2 and later. Optional connection used to select ARINC
429 Control Panel #1 or #2. When set to Ground, Control Panel #1 is used. When set to Open,
Control Panel #2 is used.
• Discrete #6 (pin 32) is used to place the unit’s transponder in Standby Mode. This is an optional
connection typically used when dual transponders are installed. Release 2.1 and later.
Note - The remote standby discrete functionality is enabled in the DCM using the MPC on the
Settings>Configuration>Misc. page.
A.2.10 Discrete Output
The unit has six discrete outputs are internally set to GND/Open. The GND (active) position illuminates
the lamp.
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 Output #1 (pin 21) is used to indicate that a terrain caution advisory is present.
• Discrete Output #2 (pin 22) is used to indicate that a terrain warning is present.
• Discrete Output #3 (pin 23) is used to indicate Traffic Alert (TA).
• Discrete Output #4 (pin 24) is reserved.
• Discrete Output #5 (pin 25) is connected to other CAWS alerting systems if required (i.e. TAS or
TCAS) that need to mute the traffic system for a higher priority audio annunciation (i.e. TAWS).
This output will be active when the Audio Mute Input (Discrete Input 2) is active.
• Discrete Output #6 (pin 26) is used to indicate that ADS-B out is not providing ADS-B output data.
The lamp has multiple visual cues used to identify operational status.