Epson Action Laser - Manual (Page 53)

Connecting the Printer to Your Computer
The DIP switches are located at the back of your printer and are
numbered 1 through 8.
The DIP switch settings are listed below. Use the tip of a ballpoint
pen or another small pointed object to turn the switches ON or OFF.
Pressing a switch down sets it ON and up sets it OFF.
Note: Turn your printer off before setting the switches. Then turn
it back on to implement your changes.
1 2 3 4 5 6 7 8
RS-232C OFF OFF OFF OFF * OFF OFF ON
RS-422A OFF OFF OFF OFF OFF ON ON OFF
* If DIP switch 5 is turned ON when the RS-232C serial interface is in use, pin 25
on the connector is set to +5V; if the DIP switch is turned OFF, the pin on the
connector is not used.
Testing and Connecting Your Printer 2-15