Epson EPL-N7000 Reference Manual page 465

The height of the bar code is automatically adjusted to 15% or
more of its total length, in conformance to the Code128
standard. For this reason, it is important to keep at least one
space between the bar code and the surrounding text to
prevent overlapping.
Some applications automatically delete the spaces at the end
of lines or change multiple spaces into tabs. Bar codes
containing spaces may not be correctly printed from
applications that automatically delete spaces from the ends of
lines or change multiple spaces into tabs.
When printing two or more bar codes on one line, separate
the bar codes with a tab, or select a font other than a BarCode
Font and input the space. If a space is input while Code128 is
selected, the bar code will not be correct.
Character type
Number of characters
Font size
The following codes are inserted automatically and need not be
input by hand:
Left/Right quiet zone
Start/Stop character
Check digit
Change code set character
454
Working with Fonts
All ASCII characters (95 in total)
No limit
26 pt to 104 pt (up to 96 pt in
Windows XP/2000/NT). Recommended sizes
are 26 pt, 52 pt, 78 pt, and 104 pt.