User's Manual

SYSTEM DESCRIPTION AND INSTALLATION MANUAL
TCAS 3000 Traffic Alert and Collision Avoidance System
34−43−23
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Page 4−48
15 Dec 2005
Table 4−8. XS−950 Data Link Transponder Interface Descriptions (cont)
Connector Pin
Designation
Functional Description
P1B−5A, 5B ARINC 429 AIR DATA COMPUTER #2 BUS INPUT: (P1B−5A [A], P1B−5B [B])
Second ARINC 429 Air Data Computer bus input. See pins P1A−7H, 7J.
P1B−5C, 5D ARINC 575 AIR DATA COMPUTER #2 BUS INPUT: (P1B−5C [A], P1B−5D [B])
Second ARINC 575 Air Data Computer bus input. See pins P1A−6H, 6J.
P1B−5E, 5F ARINC 429 COMM A/B TO ADLP BUS OUTPUT: (P1B−5E [A], P1B−5F [B])
See pins P1A−2A, 2B.
P1B−5G Extended Squitter Disable
This input is used to disable all Extended Squitter functions:
Ground = All functions disabled
Open = All functions enabled
P1B−5H MODE S DATA LINK PROGRAM INPUT:
This program input specifies if the transponder is connected to an Airborne Data Link
Processor (ADLP) Unit. The input uses ground/open logic as follows:
Ground = ADLP is Installed
Open = ADLP is not installed
P1B−5J ANTENNA BITE PROGRAM INPUT:
This program input specifies if the transponder is to perform a built−in test to the antenna
subsystem. The transponder performs a continuity check of the antenna to make sure it
is not an open circuit. The input uses ground/open logic as follows:
Ground = Enables Antenna Subsystem Test
Open = Disables Antenna Subsystem Test
P1B−6A, 6B ARINC 429 MAINTENANCE DATA BUS INPUT: (P1B−6A [A], P1B−6B [B])
Two low speed ARINC 429 busses (12.5K bits/second nominal) are provided to interface
between the transponder and an onboard maintenance system. The maintenance
computer interface is designed to work with all airframe models and types.
P1B−6C, 6D ARINC 429 MAINTENANCE DATA BUS OUTPUT: (P1B−6C [A], P1B−6D [B])
See pins P1B−6A, 6B.
P1B−6E AIR DATA SOURCE SOURCE SELECT DISCRETE INPUT:
The transponder contains dual inputs for all types of altitude sources. This discrete input
specifies which of the two inputs are used to obtain altitude information.
Ground = Altitude Source No. 2
Open = Altitude Source No. 1