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indicated in IIS. LOS set to O, shall be used to signity that no change in lockout state is commanded.
TMS, the Cbit (29-32) taclical rriessage subfield shall conlain corrimunications cunlrol infomlaliun used by lhr, dala
link avionics.
RRS, the 4-bit (21-24) reply request subfield in SD shall give the BDS2 code of a requested Comm-B reply.
Bits 25, 27 and 28 are not assigned.
TCS, the 3-bit (21-23) type control subfield in SD shall control the position type used by the transponder. The
following codes have been assigned:
0 signifies no position type command
1 signifies use surface position type for the next 15 seconds
2 signifies use surface position type for the next 60 seconds
3 signifies cancel surface type command
4-7 not assigned.
RCS, the 3-bit (24-26) rate control subfield in SD shall control the squitter rate of the transponder when it is
reporting the surface format. This subficld shall have no effect on the transponder squitter rate when it is reporting
the airborne position type. The following codes have been assigned:
0 signifies no surface squitter rate command
1 signifies report high surface squitter rate for 60 seconds
2 signifies report low surface squitter rate For 60 seconds
3 signifies suppress all surface squitters for 60 seconds
4 signifies suppress all surface squitters for 120 seconds
5-7 not assigned.
Note.- The dejinition of high and low squitter rate is given in 3.1.2.8.6.4.3.
SAS, the 2-bit (27-28) surface antenna subfield in SD shall con~rotlh e selection of the transponder diversity antenna
that is used for (1) the extended squitter when the transponder is reporting the surface format, and (2) the acquisition
squitter when the transponder is reporting the on-the-ground status. This subfield shall have no effect on the
transponder diversity antenna selection when it is reporting the airborne status. The following codes have been
assigned:
0 signifies no antenna command
I signifies alternate top and bottom antennas for 120 seconds
2 signifies use bottom antenna for 120 seconds
3 signifies return to the default.
Note.- The top antenna is the default condition (3.1.2.8.6.5).
SIS, the 6-bit (17-22) surveillance identifier subfield in SD shall contain an assigned surveillance identifier code
of the interrogator (3.1.2.5.2.1.2.4).
LSS, the 1-bit (23) lockout surveillance subfield, if set to 1, shall signify a multisite lockout command from the
interrogator indicated in SXS. If see to 0, LSS shall signify lhat no change in lockout slate is coinmanded.
Annex 10 - Aeronautical Telecommunications Volume IV
RRS, the Cbit (24-27) reply rcquest subfield in SD shall contain lhe BDS2 code of a requested GICB register.
Bits 28 to 32 are not assigned.
3.1.2.6.1.5 PC and SD field processing. When DI = 1, PC field processing shall be completed before processing rhc
SD field.
3.1.2.6.2 COMM-A ALTITUDE REQUESK UPLINK FORMAT 20
The format of this interrogation shall consist of these fields:
Ficld Reference
UF uplink format
PC protocol
RR reply request
DI designator identification
SD special designator
MA message, Cornm-A
AP addresslparity
3.1.2.6.2.1 MA: Message, Comrn-A. This 56-bit (33-88) field shall contain a data link message to the aircraft.
3.1.2.6.3 SURVEILLPNCE IDENTnY REQUEST, UPUNK FORMAT 5
The format of this interrogation shall consist of these fields:
Field Reference
UF uplink format
PC protocoZ
RR reply request
DI designator identification
SD special designator
AP addresslparity
3.1.2.6.4 COMM-AID ENTITY REQUEST, UPLINK FORMAT 21
Chapter 3 Annex 10 - Aeronautical Telecommunicatio~zs
The format of this interrogation shall consist of these fields:
Field Reference
UF uplink format 3.1.2.3.2.1.1
PC protocol 3.1.2.6.1.1
RR reply request 3.1.2.6.1.2
DI designator identification 3.1.2.6.1.3
SD special designator 3.1.2.6.1.4
MA message, Comm-A 3.1.2.6.2.1
AP addresslparity 3.1.2.3.2.1.3
3.1.2.6.5 SURVEILLANCAEL TITUDE REPLX DOWNWNK FORMAT 4
This reply shall be generated in response to an interrogation UF 4 or 20 with an RR field value less than 16. The format
of this reply shall consist of these fields:
Field Reference
DF downlink format
FS flight status
DR downlink request
UM utility message
AC altitude code
AP addresslparity
3.1.2.6.5.1 FS: Flight status. This 3-bit (6-8) downlink field shall contain the following information:
Coding
0
1
2
3
4
5
6
7
signifies no alert and no SPI, aircraf~ is airborne
signifies no alert and no SPI, aircraft is on the ground
signifies alert, no SPI, aircraft is airborne
　
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