Epson EPL-6100 Reference Manual page 252

Print Sample
EPSON EAN-8
EPSON EAN-13
EAN-13 is the standard 13-digit EAN bar code.
Because the check digit is added automatically, only 12
characters can be input.
Character type
Number of characters
Font size
The following codes are inserted automatically and need not be
input by hand:
Left/Right margin
Left/Right guard bar
Center bar
Check digit
OCR-B
150 Working with Fonts
Numbers (0 to 9)
Up to 12 characters
60 pt to150 pt (up to 96 pt in Windows XP,
2000, and NT 4.0). Recommended sizes are
60 pt, 75 pt (standard), 112.5 pt and 150 pt.