User's Manual Part 2

CAS / Part No. 9000000

SYSTEM DESCRIPTION AND INSTALLATION MANUAL

34-43-20

15 Feb 2003

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4--31

Table 4--3. 41--Pin VSI/TRA Interface Description (cont)

Connector Pin

Designation

Functional Description

J1--27 ARINC 429 (A) VERTICAL SPEED NO. 1 INPUT:

This is the primary ARINC 429 input bus to the VSI/TRA. This pin accepts high or low

speed ARINC 429 vertical speed data (Label 212). Its use is determined by the source

select discrete and configuration straps CS0 and CS1 (pins 31, 32, and 33 respectively).

Paired with pin 12.

J1--28 CONFIGURATION STRAP #2 INPUT (NO):

This is the V/S response time selection. A time constant of 3.8 sec with pin 28 open and

of 7.6 sec with pin 28 grounded.

J1--29 TA/RA VALID DISCRETE OUTPUT (NO):

This output discrete indicates the ability of the VSI/TRA to perform as a resolution

advisory and/or a traffic advisory display. If the VSI/TRA fails, this discrete presents an

open. Normal operation causes a ground. This discrete is monitored by the T

CAS

computer unit.

J1--30 ARINC 429 (A) VERTICAL SPEED NO. 2 INPUT:

This is the secondary ARINC 429 input bus to the VSI/TRA. This pin accepts high or low

speed ARINC 429 vertical speed data (Label 212). Its use is determined by the source

select discrete and configuration straps CS0 and CS1 (pins 31, 32 and 33 respectively).

Paired with pin 14.