Epson Apex-80 - Manual (Page 31)

3. Secure the plug to the printer with the wire clips on each side of the
connector. Press the clips into the metal clasps at each side of the
plug. These clips ensure that your cable will not be loosened or
unplugged accidentally.
4. If your cable has a grounding wire, fasten it to the grounding screw
below the connector.
5. Connect the other end of the printer cable to your computer. On
most computers you can easily find the correct connector for the
printer cable, but if you are not sure, consult your computer
manual.
1-24 Setting Up