Epson EPL-N3000 Reference Manual page 130

Available PostScript Memory
Specify the amount of available PostScript memory. The available
PostScript memory is a subset of the printer's total physical
memory. It is recommended that you use the default setting.
Output Protocol
Specify the protocol that the printer will use for print jobs. The
options are ASCII, TBCP, and Binary.
TBCP cannot be used with AppleTalk.
Binary can be used only when using AppleTalk.
If ASCII is selected, print data is sent in the ASCII (7-bit) format,
which may take longer to print, but which can be sent through
any I/O channel, including serial, parallel, and Ethernet.
If you select TBCP (Tagged Binary Communications Protocol), all
data except for special control characters is sent in binary (8-bit)
format. The binary formats can be sent over parallel or serial
communications ports and are faster than sending data in the
ASCII format.
Send CTRL-D Before Each Job
Specify whether a CTRL+D character should be sent at the
beginning of every PostScript document. CTRL+D at the
beginning-of-file (BOF) will reset your printer to its default
settings to ensure that prior print jobs will not affect the current
print job.
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. Conversely, if your document fails to print when sent
to a printer connected through a parallel or serial port, change the
setting to Yes.
Using the PostScript Printer Software (Windows)
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