Epson ActionNote 4SLC/33 User Manual page 64

2. Connect the serial cable to the COM 1 or COM 2 port,
3. If the connector has retaining screws, tighten them by hand
or with a screwdriver.
4. Connect the other end of the cable to the serial device. If the
connector has retaining screws, tighten them.
5. Connect the serial device's power cable (if it has one) to a
grounded (earthed) electrical socket.
Check the documentation that came with your serial device to
see if any other steps are necessary.
4-6 Connecting (Optional Devices