Epson EPL-N3000 Reference Manual page 131

Send CTRL-D After Each Job
Specify whether a CTRL+D character should be sent at the end of
every PostScript document. CTRL+D at the end-of-file (EOF) will
reset your printer to its default settings to ensure that the current
print job will not affect future print jobs.
However, activating this setting may cause the print job to fail if
it is connected through a network instead of the parallel or serial
interface. If your document fails to print when sent to a network
printer, change the setting to No.
Convert Gray Text to PostScript Gray
Specify whether to convert true gray (RGB value) in text to the
gray provided by the PostScript driver.
Convert Gray Graphics to PostScript Gray
Specify whether to convert true gray (RGB value) in graphics to
the gray provided by the PostScript driver.
Add Euro Currency Symbol to PostScript Fonts
Specify whether to add the symbol for the Euro currency to the
set of PostScript fonts residing on the printer.
Job Timeout
Specify the maximum number of seconds that can elapse for a
print job to get from the computer to the printer before the printer
stops trying to print the document. If you enter "0" (zero), the
printer will continue trying to print indefinitely.
Wait Timeout
Specify the maximum number of seconds that the printer will wait
to get more PostScript information from the computer before the
print job is automatically canceled. After the specified time
elapses, the printer will stop trying to print the document and
prints an error message instead. If you enter "0" (zero), the printer
will wait indefinitely.You may want to increase this value when
printing complicated documents.
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Using the PostScript Printer Software (Windows)