asterix 247 "Version Number Exchange"
edition 1.2
date 2008-02-01
preamble
    Surveillance data exchange.

items

    010 "Data Source Identifier"
        definition
            Identification of the radar station from which the data are received.
        group
            SAC "System Area Code"
                element 8
                    raw
            SIC "System Identification Code"
                element 8
                    raw
        remark
            Note:
                The defined SACs are on the EUROCONTROL ASTERIX website
                (www.eurocontrol.int/asterix)

    015 "Service Identification"
        definition
            Identification of the service provided to one or more users.
        element 8
            raw
        remark
            The service identification is allocated by the system.

    140 "Time of Day"
        definition
            Absolute time stamping expressed as UTC.
        element 24
            unsigned quantity 1/2^7 "s"
        remark
            The time of day value is reset to zero each day at midnight.

    550 "Category Version Number Report"
        definition
            Version number of Categories used.
        repetitive 8
            group
                CAT "Category"
                    element 8
                        unsigned integer
                MAIN "Main Version Number"
                    element 8
                        unsigned integer
                SUB "Sub Version Number"
                    element 8
                        unsigned integer

    RE "Reserved Expansion Field"
        definition
            Expansion
        explicit re

    SP "Special Purpose Field"
        definition
            Special Purpose Field
        explicit sp

uap
    010
    015
    140
    550
    -
    SP
    RE