User's Manual

ROCKWELL COLLINS
COMPONENT MAINTENANCE MANUAL with IPL
TDR-94, PART NO 622-9352
requested by the interrogators. The RR field is part of the sur veillance
and Comm A interrogations using UF numbers 4, 5, 20, and 21.
The codes used in the RR field are described as follows:
R
R REPLY LENGTH MB CON TENT
0 - 15 short -------------
16 long Air-initiated Com m B
17 long Extended capability
18 long Flight ID
19 long TCAS resolution advisory report
20 - 31 long Not assigned
If the first bit of the RR code is logic 1, then the decimal equivalent of the last
four bits designates the requested source.
1
5 Special Designator (SD)
The 16 bit SD field contains control codes affecting the transponder protocol
and is part of sur veillance and Comm A interrogations using UF numbers 4, 5,
20, and 21. The content is specified by the DI field. A 4-bit IIS subfield is within
all SD f ields of UF numbers 4, 5, 20, and 21 if the DI code is 0, 1, or 7. The IIS
is used to specify the interrogator identifier.
1
6 Uplink Format (UF)
UF is a general term referr ing to the first field in all uplink formats and is the
transmission descriptor in all interrogations. UF refers to all m essages
described in Table 7/Table 34-50-96-99A-038-A01.
FORMAT
NUMBER
UPLINK BIT F
ORMAT
HEX/
DEC
UF SHORT MESSAGE STRUCTURE MESSAGE TYPE
0 / 0 0 0000 ෥3෥ RL: 1 ෥4෥ AQ: 1
BDS:
8
෥10෥ AP: 24
SHORT
SPECIAL (Air-Air)
SURVEILLANCE
1 / 1 0 0001 Length, content, and structure undefined AP: 24
2 / 2 0 0010 AP: 24
3 / 3 0 0011 AP: 24
NOT PRESENTLY
DEFINED
OR NOT USED
4 / 4 0 0100 PC: 3 RR: 5 DI: 3 SD: 16 AP: 24
SURVEILLANCE,
ALTITUDE
REQUEST
Mode S, Interrogation Code Summary Cont.
Table 7/Table 34-50-96-99A-038-A 01
34-50-96
Page 42
May 18/06