Star Micronics NX-2400 User Manual page 41

.Most printer commands consist of the escape code followed by one or
more letters or numbers. Some examples are:
<ESC>Wl Double-width characters
<ESC>WO Normal width
<ESC>4 Italic
<ESC>5 Upright
Two lines with these commands embedded are shown below, together
with the printed result.
File:
<ESC>WlPRINTER COMMANDS<ESC>WO
can help you to use <ESC>4italic<ESC>5 print.
Printout:
PRINTER COMMANDS
can help you to use italic print.
You will probably not see the symbol < ESC > on the screen, but a
different symbol such as h E or, A [ or perhaps no symbol at all. This depends
on your software.
After printing the first page of a long job, you may want to pause to
check that the printing is correctly formatted. Press the On Line switch,
setting the printer off-line. Printing will stop immediately. To resume
printing, press the On Line switch again.
If you need to abandon a printing job before it is finished, your software
should provide a command for this purpose. Another simple expedient is
to switch the printer's power off.