User's Manual

SYSTEM DESCRIPTION AND INSTALLATION MANUAL
TCAS 3000 Traffic Alert and Collision Avoidance System
34−43−23
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Page 3−40
15 Dec 2005
F. Transponders
Table 3−7 thru Table 3−10 contain the interface information for the ACSS transponders.
The transponders use altimetry data supplied in one of the following formats: ARINC 429
(from a digital ADC), ARINC 575, Synchro, or Gillham code. Altimetry data from one of
these source types must be connected to the transponder. If a single altimetry source is
used, it should be wired to both sets of transponder inputs.
All Mode S transponders require a unique 24−bit code (Mode S address) assigned to
each aircraft. For aircraft registered in the United States, it is necessary to have a
specific address code assigned. These address codes are presently issued by:
Federal Aviation Administration
FAA Aircraft Registry
P.O. Box 25504
Oklahoma City, OK 73125
Tel: (405) 954−3116
Fax: (405) 954−3548
If the aircraft is registered in a country other than the United States, contact the aviation
authority of the country in which the aircraft is registered.
The Mode S address is usually issued as an 8−digit octal number. To strap the address
code correctly, each digit must be converted to a corresponding binary number. (For
example: 7 octal = 111 binary, 1 octal = 001 binary.)
Once the 8−digit octal code is converted to a 24−bit binary number, the straps (address
pins) must be grounded or left open according to this binary number representation.
Each binary 0 represents an open strap and each binary 1 represents a grounded strap.
An example of an octal code number being converted to a binary number is shown below:
Octal address code = 1 2 3 4 5 6 7 0
In binary this number is: (MSB) 001 010 011 100 101 110 111 000 (LSB)
(1) XS−950 Data Link Transponder
Table 3−7 contains the interconnect data for the XS−950 Data Link Transponder, Part
No. 7517800−XXYYY.
If additional XS−950 Data Link Transponder installation or operational information is
required, refer to Mode S Data Link Transponder System Description and Installation
Manual, ACSS Pub. No. A09−3839−001.