Using The Serial Interface - Epson LX-300 User Manual

Using the serial interface

1. Turn off both the computer and the printer. Plug the serial
cable connector securely into the printer's serial interface.
Tighten the screws on either side of the connector.
Note:
If there is a ground wire at the end of the cable, attach it to the
ground connector to the right of the interface.
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Setting Up the Printer