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--36
Table 4--4. XS--950 Data Link Transponder Interface Description (cont)
Connector Pin
Designation
Functional Description
P1A--3G,
P1A--3H,
P1A--3J
SDI PROGRAM INPUTS:
The SDI program inputs are used to identify the system number in the installation. The
inputs use ground/open logic levels. The SDI Common (pin P1A--3J) can be used to
supply a ground.
Program Pin
P1A--3G P1A--3H Definition
Open Open Not Applicable (SDI = 00)
Open Ground LRU System #1 (SDI = 01)
Ground Open LRU System #2 (SDI = 10)
Ground Ground LRU System #3 (SDI = 11)
P1A--4A
THRU
P1A--4J
ARINC 565 ANALOG AIR DATA COMPUTER #1 INPUTS:
These input pins allow for altitude information from an Analog Synchro Altitude Interface
to be connected to the transponder. The standards for this interface are defined in
ARINC 565, “Subsonic Air Data System”.
P1A--5A,
P1A--5B,
P1A--5C,
P1A--5D
MAXIMUM TRUE AIRSPEED PROGRAM INPUTS:
The Maximum True Airspeed inputs are used for strapping the maximum cruise airspeed
capability of the aircraft. The inputs use ground/open logic levels. The Max True
Airspeed Common (pin P1A--5D) can be used to supply a ground.
Program Pin
P1A--5A P1A--5B P1A--5C Definition
Open Open Open No Maximum Airspeed Available
Ground Open Open Maximum Airspeed ≤75 Knots
Open Ground Open Maximum Airspeed >75 and ≤150 Knots
Ground Ground Open Maximum Airspeed >150 and ≤300 Knots
Open Open Ground Maximum Airspeed >300 and ≤600 Knots
Ground Open Ground Maximum Airspeed >600 and ≤1200 Knots
Open Ground Ground Maximum Airspeed >1200 Knots
Ground Ground Ground Not Assigned
P1A--5E, 5F ARINC 429 TX COORDINATION BUS INPUT: (P1A--5E [A], P1A--5F [B])
T wo high speed ARINC 429 busses (100k bits/second nominal) are provided to interface
between the transponder and a TCAS computer unit. The standards for this interface are
defined in ARINC Characteristic 735A, “Traffic Alert and Collision Avoidance System”.
P1A--5G, 5H ARINC 429 XT COORDINATION BUS OUTPUT: (P1A--5G [A], P1A--5H [B])
See pins P1A--5E, 5F.