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transmit the TCAS interrogation signals.
Landing Gear Lever Switch
The discrete from the landing gear lever switch tells the TCAS
computer that the landing gear is down. When the TCAS
computer gets this discrete, the TCAS computer makes the
bottom directional antenna become an omnidirectional
antenna.
PSEU
The discrete from the PSEU supplies in-air or on-ground status
to the TCAS computer. The air/ground discrete inhibits TCAS
operation on the ground and inhibits tests when in the air. The
air/ground discrete also controls flight leg increments in the
TCAS nonvolatile memory.
GPWC - Advisory Inhibit Discretes
The GPWC sends one discrete to the TCAS computer. This
discrete inhibits TCAS aural and visual warnings when the
GPWC makes any voice message.
Weather Radar
The TCAS computer gets one discrete from the weather radar.
This discrete inhibits all TCAS aural warnings and changes RAs
to TAs when the weather radar makes a predictive windshear
warning.
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Suppression Input/Output
The TCAS computer gets a suppression pulse when an ATC
transponder or DME interrogator transmits. When the TCAS
computer transmits, it sends a suppression pulse to the ATC
transponders and the DME interrogators.
DEU - Display Status
A discrete from either DEU goes to the TCAS computer when
the DEU loses the ability to show TCAS displays. When the
TCAS computer gets this discrete, the TCAS computer does not
do these functions:
* Send TCAS display outputs to the DEU
* Send TCAS aurals to the REU
* Transmit coordination data to traffic airplanes with TCAS.
REU - TCAS Aurals - Voice Outputs
The TCAS computer sends resolution advisory (RA) and traffic
advisory (TA) aural signals to the remote electronic unit (REU).
The REU amplifies the RA and TA aurals. Then it sends them to
the flight interphone speakers in the flight compartment to alert
the flight crew.
Program Pins
These are the functions for the program pins on the TCAS
computer:
* Does not show airplanes that are on the ground when own
airplane is below 1750 feet AGL
* Inhibits self-test in the air
* Controls the audio level of the voice outputs
* Sets the airplane altitude limit of 48,000 feet so TCAS does
not command a climb or increase climb above this altitude.
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General
The TCAS computer has digital interfaces with these
components:
* ATC 1 transponder
* ATC 2 transponder
* Radio altimeter 1 transceiver
* Radio altimeter 2 transceiver
* Left air data inertial reference unit (ADIRU)
* Display electronic unit 2 (DEU 2)
* Display electronic unit 1 (DEU 1)
* Flight data acquisition unit (FDAU).
ATC Transponder - Control and Coordination Data
When you select an ATC transponder, it sends this ATC control
panel data to the TCAS computer:
* The TCAS mode selection (TA only or TA/RA)
* Control of the altitude limits for the TCAS display that shows
on the navigation display (ND).
The TCAS computer uses this data from the ATC transponder to
calculate the climb or descent to prevent a collision:
* 24-bit airplane address
* Barometric altitude
* Maximum true airspeed.
The TCAS computer sends this to the ATC transponder:
* General TCAS operational status
* Mode S coordination data.
Radio Altimeter Inputs
The TCAS computer gets radio altitude from radio altimeter 1
　
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