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--15

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

CAS Computer Unit Interface Description (cont)

Connector Pin

Designation

Functional Description

RBP--3K RA Data Word 270 Bit 26 Discrete Output

See RBP--1H.

RBP--4A

Thru

RBP--4F

Reserved Discrete Inputs (Standard Ground/Open)

Reserved for future use.

RBP--4G RA Display Test Inhibit Program Pin

This program pin is used to determine if RA discrete monitoring will be inhibited during

self--test. If this pin is connected to program common (ground), RA discrete self--test

monitoring is inhibited. An open on this pin indicates RA discretes monitoring during

self--test.

RBP--4H RA Data Word 270 Bit 27 Discrete Output

See RBP--1H.

RBP--4J RA Data Word 270 Bit 28 Discrete Output

See RBP--1H.

RBP--4K RA Data Word 270 Bit 29 Discrete Output

See RBP--1H.

RBP--5A Advisory Inhibit Discrete Input No. 1 (NO)

Four ground/open type discrete inputs (Note 1) at RBP--5A, --5B, --5C, and --5D provide

the capability for the T

CAS computer to defer all advisory (TA), aural alert and visual

alert outputs until another , higher priority announcement or alert is completed. An open at

all four of these discrete inputs indicates normal advisory/alert operation. These discrete

inputs become active by connection to program common (ground) at RBP--7K. No new

TA information can be placed on the RA or RA/TA busses during a period of Advisory

Inhibit. If an advisory condition, which occurred during a period of Advisory Inhibit,

remains when the T

CAS computer returns to normal operation, it is annunciated. The

Advisory Inhibit inputs and their effect on the advisory/alert priority system are as follows:

Discrete No.

Pin No. Mode Priority

1 RBP--5A Forced Standby 1

2 RBP--5B Force TA Only (no voice/tone) 2

3 RBP--5C Force TA Only (no voice/tone) 2

4 RBP--5D Force TA Only (no voice/tone) 2

Discrete No. 1 (RBP--5A) has priority over No. 2 (RBP--5B), No. 3 (RBP--5C) and No. 4

(RBP--5D). Discrete No. 1 forces TCAS into STANDBY mode. Discretes No. 2, No. 3,

and No. 4 force TCAS into TA mode with no voice or tone annunciations.

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

RBP--5B Advisory Inhibit Discrete Input No. 2 (NO)

See RBP--5A.

RBP--5C Advisory Inhibit Discrete Input No. 3 (NO)

See RBP--5A.