User's Manual Part 2

CAS / Part No. 9000000

SYSTEM DESCRIPTION AND INSTALLATION MANUAL

34-43-20

15 Feb 2003

Use or disclosure of information on this page is subject to the restrictions in the proprietary notice of this document.

4--33

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

Connector Pin

Designation

Functional Description

J1--34 CONFIGURATION STRAP #2 INPUT (NO):

See pin 31.

J1--35 CONFIGURATION STRAP #4 INPUT (NO):

See pin 17.

J1--36 SECONDARY ANALOG AC INPUT (LO):

ARINC 565 ADC

J1--37 SECONDARY SOURCE SELECT DISCRETE INPUT (NO):

See pin 31.

J1--38 VERTICAL SPEED VALID DISCRETE OUTPUT (NO):

This validity discrete is representative of the operation of the vertical speed channel.

The state of this discrete corresponds to an invalid state (OPEN) if :

· the indicator is not energized

· the indicator is in the initialization phase on power up

· the vertical speed failure warning flag is in view (case of internal or external failures)

· the self test/display test pin is activated.

Definition of the OPEN state : impedance in relation to the dc common greater than 100k

Ohms (open collector with an applicable voltage of +14 Vdc to +32 Vdc).

A valid state is indicated by either:

1) a GROUND state characterized by a voltage of less than 3.5 Vdc in relation to dc

commons with a maximum current of 20 mA, when the following types of vertical

speed are selected :

-- pneumatic input

-- digital inputs (per ARINC 429 HS or LS and digital ARINC 575).

2) a dc output voltage (+ 28 Vdc nominal), the minimum value of which is equal to VIN --

(2 + 200 x I), where VIN is the greater of the primary vertical speed and secondary

vertical speed voltages available and I the output current expressed in amps (0.02 A

max.). This type of signal is present on the output when the following types of vertical

speed are selected :

-- AC analogue input (ARINC 565)

-- DC analogue input (ARINC 575).

J1--39 DC GROUND INPUT:

To be connected to aircraft dc Ground.