Lexmark FORMS 249X Technical Reference page 182

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Section 8: Barcodes
When the m parameter is set to 1 (m = 1), the printer does not print the
human readable character.
Example:
<x
1B5B66 - barcode setup command prefix
0600 - setup data length (low byte first) -
x0006, 6
B4 - barcode type = Code 39
01 - module width = 1 = 0.017 inches for 248x
0.012 inches for 249x
00 - space width adjustment = default
3804 - height (low byte first) - x0438= 0.50
inches
00 - control byte: check digit by host, print
human readable character
>
Although the c parameter has a value of x00, which tells the printer to
print the human readable character, the m parameter has a value of x01,
which causes the b1 bit value of the c parameter to be ignored. No human
readable character is printed.
Be cautious when sending commands to change the page length and mar-
gins. The barcode print area cannot exceed the page length, bottom mar-
gin, or right margin.