The Serial Interface - Epson LQ-2550 User Manual

4. Plug the other end of the cable into the computer. (If there is
ground wire at the computer end of the cable, attach it to the ground
connector of the computer.)
5. Attach the cable cover.
Note: The cable cover should always be attached when you use the
printer.

The serial interface

Connect the serial interface cable as described in the following steps.
Before connecting the serial interface cable, be sure that:
The printer is turned off.
l
The computer is turned off.
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a
Setting Up the Printer