User's Manual

SYSTEM DESCRIPTION AND INSTALLATION MANUAL
TCAS 3000 Traffic Alert and Collision Avoidance System
34−43−23
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Page 4−37
15 Dec 2005
Table 4−6. 55−Pin VSI/TRA Interface Descriptions (cont)
Connector Pin
Designation
Functional Description
J1−12 VERTICAL SPEED NO. 1 VALID DISCRETE INPUT:
The VSI/TRA receives a 28 V dc 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 ADC #1. This pin is only used when pins ( 2, 3, 8) or (9, 10, 11) are used and
on the #1 VSI/TRA display. Also see pins 2, 10, and 11.
J1−13, 14 R/C BOOTSTRAP OUTPUT: [J1−14 (HI), J1−13 (LO)]
This two wire bus output sends ARINC 565 vertical speed data to the cross−side display
when the bootstrap mode is activated. These pins are connected to the ARINC 565
Secondary Vertical Speed Input bus on the cross−side display as follows:
J1−14 of the on−side display is connected to J1−6 of the cross−side display.
J1−13 of the on−side display is connected to J1−1 of the cross−side display.
J1−15 BOOTSTRAP COMMAND OUTPUT:
This pin is connected to the Source Select #2 (SS2) discrete input, pin 29, within the
VSI/TRA. The output provides an Open/28 V dc discrete that can be used to annunciate
the bootstrap function. This output is normally not used.
J1−17 CONFIGURATION STRAP #5 INPUT (NO):
For −84X units, CS5 is paired with CS6 (pin 37) to program the altitude band. The
following apply: O = Open, G = Ground
CS5 CS6
Pin 17 18 Definition
O O Normal −A to +A
G O Above −A to +B
O G Below −B to +A
G G Unrestricted Range
For −86X, −88X and −89X units, CS5 is paired with CS4 (pin 36) to program the Display
Format. The following apply: O = Open, G = Ground
CS5 CS4
Pin 17 36 Definition
O O VSI/RA/TA
O G VSI/RA
G O VSI Only
G G Invalid
J1−18 CONFIGURATION STRAP #6 INPUT (NO):
For −84X units, see pin 17.
For −86X, −88X, and −89X units CS6 is used to program the Traffic Filter. If pin 18 is
Open, the VSI/TRA is programmed to not display other traffic. If pin 18 is grounded,
other traffic will be displayed.
J1−19 CONFIGURATION STRAP #7 INPUT (NO):
This configuration strap is used during factory test to take the VSI/TRA out of
flight mode and into test mode when grounded. This pin must be left unwired,
“Open” in all aircraft installations.