User's Manual Part 2

T
2
CAS / Part No. 9000000
SYSTEM DESCRIPTION AND INSTALLATION MANUAL
34-43-20
15 Feb 2003
Use or disclosure of information on this page is subject to the restrictions in the proprietary notice of this document.
4--38
Table 4--4. XS--950 Data Link Transponder Interface Description (cont)
Connector Pin
Designation
Functional Description
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.
P1A--7H, 7J ARINC 429 ADC #1 BUS INPUT: (P1A--7H [A], P1A--7J [B])
The altitude information for the transponder can be obtained from an ARINC 706 Air Data
System through two low speed ARINC 429 data busses. The standards for this interface
are defined in ARINC Characteristic 706, “Mark 5 Subsonic Air Data System”.
This differential pair input is a low speed ARINC 429 bus that inputs uncorrected pressure
altitude (ARINC label 203) from an altitude source. Also see pins P1B--5A, 5B.
P1A--71 TOP ANTENNA RF INPUT:
RF input from top antenna.
P1B--1A
THRU
P1B--3E
MODE S ADDRESS INPUTS:
The Mode S Address is a unique 24--bit code assigned to each aircraft. Pins P1B--1A
thru P1B--3E are used to program this 24--bit binary number . The inputs must be set
according to this binary number representation. Each binary 1 represents a Grounded pin
and each binary 0 represents an Open pin. Pin P1B--1A represents the most significant
bit (MSB) of the binary number and pin P1B--3D represents the least significant bit (LSB)
of the binary number .
NOTE: An address of all 0’s or all 1’s is an illegal address, and can cause the aircraft to
be invisible to TCAS II equipped aircraft in flight. Never use an illegal address
for an installed system.
P1B--3H FUNCTIONAL TEST DISCRETE INPUT:
This discrete input is used to put the transponder in a functional test mode. The
functional test that is performed by the transponder is equivalent to a test that is initiated
from the control panel. The input uses ground/open logic as follows:
Ground = Initiate Functional Test
Open = Normal Operation