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IRL Data Files


     The memory of the bar code reader can be divided into as
     many as 26 files labeled with a single letter from A to Z.
     Each of these files is then divided into individual records,
     labeled numerically (beginning at 0).  For example, File A,
     Record 5 is represented as A(5).  Records can also be
     identified by a value contained in a numeric register.  For
     example, if 5 is stored in numeric register #2, the
     identifier A(#2) would also refer to File A, Record 5.  The
     Open File command is used to assign a maximum number of
     records with a maximum record length of up to 128
     characters.

     The Open File command(s) must be the first command(s) in a
     program.

     The Open File command has the following format:

     Ox(r,s) where x is the file name (A through Z), r is the
     maximum number of records, and s is the maximum length of a
     record.

     The size of each file is determined by multiplying the
     maximum record lenght +2 (for string length byth and LRC)
     by the number of records assigned to the file.  The sum of
     all files can not exceed memory size allowed by the device.
     If the sum is greater than the allowable memory size, an
     error will occur during compilation and the editor will
     display the O command whic exceeded the memory limits.

     Each record is stored in memory as follows:

             STRING LENGTH   DATA CHARACTERS   LRC

     During each record fetch, the LRC is checked (the LRC is
     calculated as an exclusive OR of all characters).  If an
     error is detected, the bar code reader displays the
     following message:

             LRC data error