Epson EPL-N3000 Reference Manual page 124

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.
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.
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.
Using the PostScript Printer Software (Windows)
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