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.
3--20
H. Transponders
Table 3--3 thru Table 3-- 6 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: [phone]
Fax: [phone]
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 = 12345670
In binary this number is: (MSB) 001 010 011 100 101 110 111 000 (LSB)
(1) XS --950 Data Link Transponder
Table 3--3 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.