Epson EPL-N7000 - Manual (Page 439)

428 Functions of the Control Panel
If you select BarCode, the printer converts bit images to bar codes
by automatically filling in any vertical gaps between dots. This
produces unbroken vertical lines that can be read by a bar code
reader. This mode will reduce the size of the image being printed,
and may also cause some distortion when printing bit image
graphics.
ZeroChar
Selects whether the printer prints a slashed or unslashed zero.
CharacterSet
Selects character table 1 or 2.