User's Manual

SYSTEM DESCRIPTION AND INSTALLATION MANUAL
TCAS 3000 Traffic Alert and Collision Avoidance System
34−43−23
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Page 4−33
15 Dec 2005
Table 4−5. 41−Pin VSI/TRA Interface Descriptions (cont)
Connector Pin
Designation
Functional Description
J1−30 ARINC 429 (A) VERTICAL SPEED NO. 2 INPUT:
This is the secondary ARINC 429 input bus to the VSI/TRA. This pin accepts high or low
speed ARINC 429 vertical speed data (Label 212). Its use is determined by the source
select discrete and configuration straps CS0 and CS1 (pins 31, 32 and 33 respectively).
Paired with pin 14.
J1−31 SOURCE SELECT DISCRETE INPUT (NO):
This discrete input is used in conjunction with configuration straps CS0 and CS1 to
program the VSI/TRA to accept and use the vertical speed data being supplied. In some
installations, this discrete is connected to a switch in the cockpit and is used to select
between primary and secondary ARINC 429 vertical speed inputs. It is hard wired to
configuration strap common if ac or dc analog vertical speed inputs are used. Cycle
power to update to the new configuration.
The following applies: O = Open, G = Ground.
SS CS0 CS1
Pin 31 32 33 Definition
O O O ARINC 429 HS Primary
G O O ARINC 429 HS Secondary
O G O Pressure Transducer Module (PTM)
G G O ARINC 575 dc
G O G ARINC 565 ac
O G G ARINC 429 LS Primary
G G G ARINC 429 LS Secondary
J1−32 CONFIGURATION STRAP #0 INPUT (NO):
See pin 31.
J1−33 CONFIGURATION STRAP #1 INPUT (NO):
See pin 31.