User's Manual

SYSTEM DESCRIPTION AND INSTALLATION MANUAL
TCAS 3000 Traffic Alert and Collision Avoidance System
344323
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Page 439
15 Dec 2005
Table 46. 55Pin VSI/TRA Interface Descriptions (cont)
Connector Pin
Designation
Functional Description
J129 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
J131 SOURCE SELECT #1 DISCRETE INPUT (NO):
See pin 29.
J132 CONFIGURATION STRAP #0 INPUT (NO):
See pin 29.
J133 CONFIGURATION STRAP #1 INPUT (NO):
See pin 29.
J134 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
J134 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)