Epson SQ-2550 User Manual page 45

If none of these printers is listed, select the first one available
on the following list:
LQ
EX
FX
LX
RX
MX
EPSON printer
Standard printer
Draft printer
To use all the features of the SQ-850 or SQ-2550, however, it is
best to use a program with the SQ-850 or SQ-2550 on its menu.
If your program does not list your printer, contact the software
manufacturer to see if an update is available. For more
information on using software, see Chapter 4.
Connecting the Printer to Your Computer
Setting Up the Printer 1-33