User's Manual

SYSTEM DESCRIPTION AND INSTALLATION MANUAL
TCAS 3000 Traffic Alert and Collision Avoidance System
34−43−23
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Page 4−46
15 Dec 2005
Table 4−8. XS−950 Data Link Transponder Interface Descriptions (cont)
Connector Pin
Designation
Functional Description
P1A−6C, 6D ARINC 615 AIRBORNE DATA LOADER BUS INPUT: (P1A−6C [A], P1A−6D [B])
The Airborne Data Loader interface consists of two high speed ARINC 429 busses (100K
bits/second nominal) and a ground/open logic discrete (pin P1A−6G). The interface
allows for operational transponder software to be loaded into the unit through an onboard
data loader. The standards for this interface are defined in ARINC 615 “Airborne
Computer High Speed Data Loader”.
P1A−6E, 6F ARINC 615 AIRBORNE DATA LOADER BUS OUTPUT: (P1A−6E [A], P1A−6F [B])
See pins P1A−6C, 6D
P1A−6G ADL INPUT LINK A DISCRETE INPUT:
See pins P1A−6C, 6D
P1A−6H, 6J ARINC 575 AIR DATA COMPUTER #1 INPUT: (P1A−6H [A], P1A−6J [B])
This differential pair input is a low speed ARINC 575 bus (12.5K bits/second nominal) that
can be used to input altitude information from an ARINC 575 Air Data System. The
standards for this interface are defined in ARINC Characteristic 575, “Subsonic Air Data
System (Digital) DADS”.
P1A−6K SINGLE / DUAL ANTENNA PROGRAM INPUT:
This pin allows for installation of the transponder in a system with a single bottom
mounted antenna or dual top and bottom mounted antennas. The input uses
ground/open logic as follows:
Ground = Single Bottom Mounted Antenna Configuration
Open = Diversity Antenna Configuration
P1A−7A, 7B ARINC 429 CONTROL DATA PORT A BUS INPUT: (P1A−7A [A], P1A−7B [B])
The control panel data can be input into the transponder on either of two low speed
ARINC 429 busses. (Ports A and B). The control data is contained in labels 013, 015,
and 016. The port is selected by the CONTROL DATA PORT SELECT Discrete Input
(pin PIA−7D).
P1A−7D CONTROL DATA PORT SELECT INPUT:
See pins P1A−7A, 7B.
This discrete input is used to select which port is used to input control data to the
transponder. This input uses a ground/open logic as follows:
Ground Specifies Port A
Open Specifies Port B
P1A−7E, 7F ARINC 429 CONTROL DATA PORT B BUS INPUT: (P1A−7E [A], P1A−7F [B])
See pins P1A−7A, 7B.
P1A−7G STANDBY / ON DISCRETE INPUT:
This discrete input is connected to the Control Panel STANDBY/ON output. The input
selects the active or standby status of the transponder. A ground causes the transponder
to be in standby, and an open causes the transponder to be active.