VMS Help CONVERT, file, Qualifiers, /TRUNCATE  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    Specifies whether records that exceed the maximum record length
    for variable-length records, or records that exceed the specified
    record length for fixed-length records, are to be truncated.

    Format

      /TRUNCATE

      /NOTRUNCATE  (DEFAULT)

    If you specify /NOTRUNCATE and a long record is encountered, the
    record is not written to the output file. If you specify the
    /EXCEPTIONS_FILE qualifier, the entire record is written to the
    exceptions file.