Epson 1500 - Manual (Page 44)

Perform these steps by sending specific commands from your
computer to your printer. For step 1, always send the universal
exit command:
Next you must immediately send an EJL command. For
example, you can enter the LQ emulation by sending the
following commands.
“@EJL ENTER LANGUAGE = LQ”
The printer emulation indicated on the display changes to the
new one.
Overview of the EJL commands
EJL commands must be sent immediately after the printer
receives the universal exit command; otherwise the printer
returns to its default printer emulation.
Every EJL command starts with the string: @EJL, which must
be in uppercase letters, although other commands can be in
both uppercase and lowercase.
You must send the LF code at the end of an EJL command; only
an LF code terminates the EJL command. If the EJL command is
not followed by an LF code, the printer does not recognize it as
an EJL command; it is then printed as a character string in the
current printer emulation.
If the printer emulation you attempt to switch to is not
available, the printer switches to the default printer emulation.
If you are in Epson GL mode, you cannot exit with the
universal exit command. You must switch emulations with
SelecType.
1-28 Con trolling Your Printer