Epson EPL-6100 Reference Manual page 160

Note:
If you change the Orientation, Page Size, or T.Margin settings, the page
length setting automatically returns to the default setting for each paper
size.
Auto CR
Allows you to use the automatic carriage return option to perform
a carriage return line-feed (CR-LF) operation whenever the print
position exceeds the right margin. If Auto CR is Off, the printer
does not print characters beyond the right margin, and it does not
perform a linewrap until it receives a CR. Most application
programs take care of this function.
Auto LF
Allows you to specify the line feed setting. If you set AutoLF to
Off, the printer does not send an automatic line feed (LF)
command with each carriage return (CR). When you set AutoLF
to On, the printer adds a line feed to each carriage return it
receives. If your text lines overprint each other, set AutoLF to On.
Bit Image
With Bit Image set to Dark or Light, your printer can correctly
emulate the graphics densities set with the printer commands. If
you select Dark, the bit image density is high. If you select Light,
the bit image density is low.
With Bit Image set to BarCode, your 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. BarCode is not available in I239X mode.
This mode reduces the size of the image being printed and may
cause some distortion when printing bit-image graphics.
58 Using the Remote Control Panel Utility