Epson Action Laser II - Manual (Page 56)

Connecting the Printer to Your Computer
4. If your cable has a grounding wire, connect it to the printer’s
ground connector as shown.
5. Plug the other end of the parallel cable into your computer and
fasten the connector screws to the interface, if necessary. Some
parallel cables have grounding wires at the computer end as
well. If so, connect this wire to the ground screw on the
computer.
Note: You can use the SelecType Level 2 I/F CONFIG option to
change some of the parallel interface settings. However, you will
probably never need to change these settings.
Now you can test the computer-to-printer connection as described
below.
2-16 Testing and Connecting Your Printer