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--30

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

Connector Pin

Designation

Functional Description

J1--17 CONFIGURATION STRAP #3 INPUT (NO):

Pin 17 is used in conjunction with pin 35 to select the indicator operating mode as follows:

The following applies: O = Open, G = Ground.

Pin 35 17 Indicator Operating Mode

G G Test (shop level)

G O VSI only

O G RA VSI only

O O TA/RA VSI

J1--18 SECONDARY VERT SPEED VALIDITY INPUT (+28 Vdc):

The VSI/TRA receives a +28 Vdc signal from an ARINC 575 or 565 air data computer

indicating its valid operation. An “open” at this pin indicates an invalid vertical speed

signal from the ADC. This pin is only used when pins (1, 2, 3) or (4, 5, 6, and 16) are

used.

J1--19, 20 VERT SPEED BOOTSTRAP AC OUT: (J1--19 [HIGH], J1--20 [LO])

This output repeats the ARINC 565 input signals (26 V 400 Hz reference and signal)

available on the primary input when this input has been selected :

-- 26 V 400 Hz reference

The voltage available on the output (26 Vac Bootstrap ref. output) is the same as that

available on the 26 Vac 400 Hz reference (hot) of the ARINC 565 primary input, the

common reference being the cold of the 26 Vac primary ref. input.

-- Output signal (vertical speed bootstrap AC output) available on two wires (HI and LO).

J1--22 CHASSIS GROUND INPUT:

Connected to aircraft frame. Also used to connect ARINC cable shields to the chassis.

J1--23 115 Vac, 400 HZ POWER INPUT (COMMON):

See pin 40. Connect to aircraft AC ground.

J1--24, 25 REMOTE LIGHT SENSOR INPUT: (J1--24 LOW, J1--25 HIGH)

This input at pins 24 and 25 provides a means of controlling the VSI/TRA back lighting via

a remote light sensor already present in some aircraft (Douglas and Boeing). The

VSI/TRA has its own built--in sensor and therefore a remote light sensor need not be

used in all installations. Program the VSI/TRA for a remote light sensor, as described

under pin 34.

J1--26 ARINC 429 (A) TCAS TA/RA DATA INPUT:

T raffic and Resolution Advisory data is supplied to the VSI/TRA from the T

CAS

computer unit via this high speed ARINC 429 data bus. Paired with pin 11.