RJS Inspector D4000 Laser (FIRMWARE version A.05 and Earlier) - Manual (Page 37)

Operator ’ s Guide Appendix A
002-5568 RJS, Minneapolis, MN 31
Due to the flexibility and nature of Code 128, it is difficult to display “printable” and
“nonprintable” control codes side by side without confusion. However, the approach
taken here (detailed below) simplifies the displaying of this information.

As indicated before, each of the 3 subsets have “unique” features:

Subset A allows for encodation of control codes but not lower case characters.

Subset B allows for lower case characters but not control codes.

Subset C allows for only numeric data in a compressed format.
Code 128 also offers the flexibility to “shift” to other subsets in order to combine the
“unique” features into one condensed barcode.
The encoded data occupies 2 rows on the LCD and is encoded in a columnar display with
one character above the other.
Display of Code 128 (Rules)
• The first character (column) displays the subset (*A = Subset A).
• The last character is a stop code (**).
• The second from the last is a mod 103 check character.
• Double characters beginning with alphanumeric characters designate nonprintable control
codes applicable to all subsets.
• Double numeric characters designate the compressed digit mode in subset C only.
• Single characters will always be displayed on the lower row and are applicable to only
subsets A and B (normal printable characters.)