User's Manual
SYSTEM DESCRIPTION AND INSTALLATION MANUAL
TCAS 3000 Traffic Alert and Collision Avoidance System
34−43−23
Use or disclosure of information on this page is subject to the restrictions in the proprietary notice of this document.
Page 4−39
15 Dec 2005
Table 4−6. 55−Pin VSI/TRA Interface Descriptions (cont)
Connector Pin
Designation
Functional Description
J1−29 SOURCE SELECT #2 DISCRETE INPUT:
This discrete input is used in conjunction with source select discrete #1 (SS1) and
configuration straps CS0 and CS1 to program the VSI/TRA to accept and use the vertical
speed data being supplied. The following applies: O = Open,
G = Ground, 28V = 28 V dc and X = Don’t Care.
SS2 SS1 CS0 CS1
Pin 29 31 32 33 Definition
X O O O ARINC 429 HS Primary
X G O O ARINC 429 HS Secondary
X O G O Pressure Transducer Module (PTM)
X G G O ARINC 575 ADC
28V O O G A310 ADC Secondary
O O O G A310 ADC Primary
28V G O G ARINC 565 ac Secondary
O G O G ARINC 565 ac Primary
X O G G ARINC 429 LS Primary
X G G G ARINC 429 LS Secondary
J1−31 SOURCE SELECT #1 DISCRETE INPUT (NO):
See pin 29.
J1−32 CONFIGURATION STRAP #0 INPUT (NO):
See pin 29.
J1−33 CONFIGURATION STRAP #1 INPUT (NO):
See pin 29.
J1−34 CONFIGURATION STRAP #2 INPUT (NO):
For −84X and −88X units, this pin programs the VSI/TRA to use the remote light sensor
input at pins 23 and 24. If CS2 is open, a Boeing Airplane Company remote light sensor
type (−10 to +10 V) is expected at pins 23 and 24. If pin 34 is grounded, a McDonnell
Douglas Aircraft Company remote light sensor type (0 to 18 V) is programmed. Also see
pins 23/24.
For −89X units, CS2 is used to program the VSI display for English or Metric. If pin
J1−34 is open, information is displayed in English. If pin 34 is grounded, the information
is displayed in Metric.
For −86X units, CS2 is used with CS3 (pin 17) to program the lighting curve. The
following applies: O = Open, G = Ground
CS2 CS3
Pin 34 35 Definition
O O Boeing (Normal Configuration)
G O McDonnell Douglas
O G Invalid (Displays VSI/TRA Red X fault if wired)
G G Invalid (Displays VSI/TRA Red X fault if wired)