Epson EPL-N3000 Reference Manual page 406

Do not apply shading or special character formatting, such as
bold, italic, or underline.
Print bar codes in black and white only.
When rotating characters, only specify rotation angles of 90 ,
180 , and 270 .
Turn off all automatic character and word spacing settings in
your application.
Do not use features in your application that enlarge or reduce
the size of characters in only the vertical or horizontal
direction.
Turn off your application's auto-correct features for spelling,
grammar, spacing, etc.
To more easily distinguish bar codes from other text in your
document, set your application to show text symbols, such as
paragraph marks, tabs, etc.
Because special characters such as Start bar and Stop bar are
added when an EPSON BarCode Font is selected, the
resulting bar code may have more characters than were
originally input.
For best results, use only the font sizes recommended in
"BarCode Font specifications" on page 394 for the EPSON
BarCode Font you are using. Bar codes in other sizes may not
be readable with all bar code readers.
Note:
Depending on the print density, or on the quality or color of the paper,
bar codes may not be readable with all bar code readers. Print a sample
and make sure the bar code can be read before printing large quantities.
Working with Fonts
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