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R DF=11 (0 1011) (CA:3) (AA:24) (PI:24)
R
R - Long TCAS Reply (COMM-V):
R DF=16 (1 0000) (VS:1) 2_ (SL:3) 2_ (RI:4) (AC:13) (MV:56)
R (AP:24)
R
R - COMM-B Reply, Altitude:
R DF=20 (1 0100) (FS:3) (DR:5) (UM:6) (AC:13) (MB:56)
R (AP:24)
R
R - COMM-B Reply, Identity:
R DF=21 (1 0101) (FS:3) (DR:5) (UM:6) (ID:13) (MB:56)
R (AP:24)
R
R - Downlink Extended Length Message (DELM)/COMM-D:
R DF=24 (1 1) 1_ (KE:1) (ND:4) (MD:80) (AP:24)
R
R c_ Mode S interrogation data field definition
R The following table gives the definition of uplink format
R message fields:
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R -------------------------------------------------------------------------------
R | DESIGNATOR | FIELD | INDICATION |
R -------------------------------------------------------------------------------
R | AP | address parity | 24-bit address and parity overlaid |
R | | | |
R | AQ | acquisition | differentiates acquisition from non-acquisi- |
R | | | tion interrogations |
R | | | |
R | DI | designator | identifies the coding contained in the SD |
R | | identification | field |
R | | | |
R | II | interrogator | identifies the interrogator |
R | | identification | |
R | | | |
R | MA | message | 56-bit MA field contains messages directed |
R | | Comm A | to the A/C |
R | | | |
R | MC | message | 80-bit MC field contains one segment of a |
R | | Comm C | sequence of segments transmitted in ELM mode. |
R | | | |
R | MU | message | 56-bit MU messages contains information used |
R | | Comm U | in air-to-air exchanges |
R | | | |
R | NC | number of C | number of segments transmitted in ELM mode |
R | | segments | |
R | | | |
R | PC | protocol | operating commands of the transponder |
R | | | |
R | PR | probability | contains commands to the transponder to |
R | | of reply | specify the reply probability to the mode S |
R | | | only all-call interrogations (Allows |
R | | | operators to acquire closely spaced A/C). |
R | | | |
R | RC | reply | designates the transmitted segment as initial,|
R | | control | intermediate or final |
R | | | |
R | RL | reply | indicates if message is short or long |
R | | length | |
R | | | |
R | RR | reply | length and content of the reply information |
R | | request | requested by the interrogator |
R | | | |
R | SD | special | contains control codes affecting the link |
R | | designator | protocol |
R -------------------------------------------------------------------------------
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R The table below gives the definition of downlink format
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