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IRIG Formats,  IRIG code designations

    The name of an IRIG code format consists of a single letter plus 3 subsequent digits. Each letter or digit reflects an attribute of the corresponding IRIG code. The following table contains standard code formats defined in IRIG standard 200-98:

       IRIG A   IRIG B   IRIG D   IRIG E   IRIG G   IRIG H 
      A000 B000 D001 E001 G001 H001
      A003 B003 D002 E002 G002 H002
      A130 B120 D111 E111 G141 H111
      A132 B122 D112 E112 G142 H112
      A133 B123 D121 E121   H121
          D122 E122   H122

    *Note  IRIG-C was part of the original specification, but was replaced by IRIG-H

    The code format names are composed as described below:

      First letter:
      Rate Designation
      A
      B
      D
      E
      G
      H
      1,000 PPS      ( 1 ms count )
      100 PPS         ( 10 ms count )
      1 PPM             ( 1 minute count )
      10 PPS           ( 0.1 second count )
      10,000 PPS    (  0.1 ms count )
      1 PPS             ( 1 second count )
      1st Digit:
      Form Designation
      0
      1
      DC Level Shift (DCLS), width coded, no carrier
      Sine wave carrier, amplitude modulated
      2nd Digit:
      Carrier Resolution
      0
      1
      2
      3
      4
      No carrier(DCLS)
      100 Hz / 10 millisecond resolution
      1 kHz / 1 millisecond resolution
      10 kHz / 100 microsecond resolution
      100 kHz / 10 microsecond resolution
      3rd Digit:
      Coded Expressions
      0
      1
      2
      3
      4*
      5*
      6*
      7*
      BCD, CF, SBS
      BCD, CF
      BCD
      BCD, SBS
      BCD, BCD_Year, CF, SBS
      BCD, BCD_Year, CF
      BCD, BCD_Year
      BCD, BCD_Year, SBS

      *IRIG standard 200-04 added year informaion.
      Abbreviations used in the table above:

      • BCD - Binary Coded Decimal, coding of time (HH,MM,SS,DDD)
      • BCD - Binary Coded Decimal, coding of Year (HH,MM,SS,DDD)
      • SBS - Straight Binary Second of day (0....86400)
      • CF - Control Functions depending on the user application

 

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