User's Manual Part 2

ManualsBrandsACSS an L-3 Communications and Thales ManualsElectronicsTCAS

CAS / Part No. 9000000

SYSTEM DESCRIPTION AND INSTALLATION MANUAL

34-43-20

15 Feb 2003

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4--2

Table 4--1. TT--950/951/952 T

CAS Computer Unit Interface Description

Connector Pin

Designation

Functional Description

CAS Computer Unit Right Middle Plug (RMP)

RMP--1A,

RMP--1D

Reserved Discrete Outputs (Standard Ground/Open)

RMP--1E TA Display Enable Discrete Output (NO)

This output is a ground/open type discrete (Note 3) used by the weather radar display to

place the radar in standby mode. A ground on this pin enables the weather radar display.

RMP--1F Corrective Aural Advisory Discrete Output (NO)

This aural advisory discrete output is a ground/open type discrete (Note 3) used to control

external equipment that generate tones to accompany TCAS advisories. The output is

active whenever a corrective advisory (RA that requires a corrective maneuver) is issued.

The output remains active for the duration of the synthesized voice unless it is cancelled

by the cancel discrete at RMP--3D. Only one aural advisory is active at a time. The

corrective discrete and preventative discrete at RMP--1K are mutually exclusive. The

active state is ground and the inactive state is open.

RMP--1G Reserved for GPS use.

RMP--1H Reserved for GPS use.

RMP--1J Climb Inhibit No. 1 Discrete Input (NO)

This input is a ground/open type discrete used to provide information to the T

CAS CU

whether to assume the aircraft cannot achieve a climb rate of 1500 feet per minute

(FPM). The climb inhibit discrete inputs are designed in pairs (No. 1 and No. 2 at

RMP--13G, or No. 3 at RBP--5J and No. 4 at RBP--5K) but can be wired as a single input

or in conjunction with other aircraft operations to achieve airframe customization of the

climb inhibit feature. The 1500 FPM climb inhibit function is assumed whenever No. 1

and No. 2 are ground or No. 3 and No. 4 are ground.

See Note 1 for Ground/Open type discrete input definition.

RMP--1K Preventive Aural Advisory Discrete Output (NO)

Same as RMP--1F, except this discrete is active whenever a preventative advisory (RA

that directs the flight crew to avoid certain maneuvers or maintain flight path) is issued.

RMP--2A T raffic Aural Advisory Discrete Output (NO)

Same as RMP--1F, except this discrete is active during a traf fic advisory when information

is being given to the flight crew regarding other aircraft in the immediate vicinity. No

suggested maneuver is issued. This output is inhibited if either the corrective or

preventative output is active.

RMP--2B Reserved for TAWS/RWS use.

RMP--2C Reserved for TAWS/RWS use.

RMP--2D Advisory/Announce Common

This is the return line for the aural and visual advisory discrete outputs.