Datamax-O'Neil Class Series Programmer’s Manual - Manual (Page 196)

Appendix G – Barcode Details
Class Series Programmer’s Manual 182
C: UPC-E
Valid Characters: 0-9
Length: Seven digits. If the user provides six digits, the printer will compute the checksum. If the user
provides the checksum, the printer will check that it matches the expected checksum. If it does not
match, the printer will print out all zeros and the expected checksum.
Valid bar widths: The fourth character of record is the width of the narrow bar in dots. All other bars
are a ratio of the narrow bar (2 times, 3 times, and 4 times the narrow bar width).
The following example prints a UPC-E bar code:
<STX>L
D11<CR>
1C0000000150100012345<CR>
121100000000100Barcode C<CR>
E
D: Interleaved 2 of 5 (I 2 of 5)
Valid Characters: 0-9
Variable Length.
Valid bar widths: The expected ratio of wide to narrow bars can range from 2:1 to 3:1.
The following example prints an Interleaved 2 of 5 bar code with a wide to narrow bar ratio of 3:1:
<STX>L
D11<CR>
1D000000015010001234567890<CR>
121100000000100Barcode D<CR>
E
E: Code 128
Valid Characters: The entire 128 ASCII character set.
Variable Length
Valid bar widths: The fourth character of record is the width of the narrow bar in dots. All other bars
are a ratio of the narrow bar (2 times the narrow bar width, 3 times the narrow bar width, and 4 times
the narrow bar width).
This printer supports the Code 128 subsets A, B, and C. The printer can be selected to start on any
code subset and switch to another within the data stream. The default code subset is B; otherwise, the
first character (A, B, C) of the data field determines the subset. Subset switching is only performed in
response to code switch command. These commands are placed in the data to be encoded at
appropriate locations, see Table G-1.
 Note: It is recommended to use a B as the first character to prevent an A or C from changing the subset.