Epson 4SLC2-50 - Manual (Page 62)

4. If the connector has retaining screws, tighten them by hand or
with a screwdriver.
5. Connect the other end of the cable to the printer. If the printer
interface has retaining clips, squeeze them gently until they
snap into place.
6. Connect the printer’s power cable to a grounded (earthed)
electrical socket.
Connecting a Serial Device
You can use the COM 1 and/or COM 2 port to connect serial
devices, such as a serial printer or plotter. You could also connect a
modem or pointing device, such as a trackball or mouse.
Note
You cannot use the COM 2 port if the internal fax/modem is
installed.
Follow these steps to connect a serial device:
1. Make sure both computer and the serial device are off.
Connecting Optional Devices 4-5