Using The Serial Interface - Epson LQ-300+ User Manual

Using the serial interface

You need a serial cable that has a DB-25 male connector on the
printer side to use the serial interface.
Follow these steps to connect the printer to the computer using
the serial interface:
1. Turn off both the computer and the printer.
2. Plug the serial cable connector securely into the printer's
serial interface port. Tighten the screws on both sides of the
connector.
Setting Up the Printer
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