Epson 3000 - Manuel (Page 156)

The bidirectional setting causes the print heads to print in both
directions. This provides the fastest printing. If vertical or
horizontal lines are not aligned, align the print heads as shown
on page 8-41. If you can’t use the calibration utility, you will
need to align the print heads using the print head alignment
mode.
The unidirectional setting causes the print heads to print in one
direction only. This provides maximum alignment for both
graphics and character printing.
Font
Use this setting to select which built-in font should be used as
the default. For more details, see “Selecting fonts” on page 6-12.
Pitch
With this setting, you can specify the default character pitch to
be used for printing.
I/F mode
Your EPSON printer has both a parallel and serial interface,
allowing you to share the printer between two computers.
If you select Auto, the printer automatically selects the
interface that is receiving data, and uses that interface until the
end of the print job. (A print job ends when no data is received
from the selected interface for the amount of time specified in
the Auto interface wait time setting described below.)
Set this option to Parallel if you want the printer to ignore data
from the serial interface or to Serial if you want the printer to
ignore data from the parallel interface.
Select Option if you have installed an optional interface card
and want the printer to ignore data from the built-in parallel or
serial interface.
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6-6 The Control Panel