Lexmark FORMS 249X Technical Reference page 180

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180
Section 8: Barcodes
The desired barcode may not print if invalid characters are specified in the
data transfer command.
Example:
<x
1B5B66 - barcode setup command prefix
0600 - setup data length (low byte first) -
B9 - barcode type = POSTNET
00 - module width = default
00 - space width adjustment = default
0E01 - height (low byte first) - x010E =
00 - control byte
1B5B70 - barcode data transfer command prefix
0500 - data transfer length (low byte first)
>012a5 ...
Since the desired barcode is POSTNET (B9), the letter 'a' is not a valid
character. The numbers '0'-'9' are the only valid characters for POSTNET.
x0006, 6
0.125 inches
- x0005, 5