Epson EPL-N7000 - Manual (Page 139)

128 Using the PostScript Printer Driver (Windows)
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.
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.