Star Micronics LC-8521 - Manual (Page 27)

Connecting to your computer with a serial cable 19
❏
Plug one end of the serial cable into the serial port of your computer. The
parallel port should be labeled “COM1,” “COM2,” or something similar.
❏
Lift up the back of the printer and insert two books or other similar objects
underneath it to keep the printer raised.
❏
Plug the other end of the serial cable into the socket on the back of the
printer and secure it in place with the screws.