Epson AcuLaser C8600 Reference Manual page 384

Print sample
EPSON UPC-E
EPSON Code39
Four Code39 fonts are available, allowing you to enable and
disable the automatic insertion of check digits and OCR-B.
The height of the bar code is automatically adjusted to 15% or
more of its total length, in conformance to the Code39
standard. For this reason, it is important to keep at least one
space between the bar code and the surrounding text to
prevent overlapping.
Spaces in Code39 bar codes should be input as "_" underbars.
When printing two or more ba rcodes 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 a Code39
font is selected, the bar code will not be correct.
Character type
Number of characters
382 Working with Fonts
Alphanumeric characters (A to Z, 0 to 9)
Symbols (- . space $ / + %)
No limit