Brother HL-720 User Manual page 38

You can connect a parallel and a serial interface cable at the same time. The
auto interface selection function allows you to share the printer with two
computers. To do this, connect the parallel interface cable and then connect
the serial interface cable as follows:
1. Make sure that the power switch is turned off.
!
Caution
Be sure to turn off the power switch before connecting or disconnecting the
interface cables, or the printer may be damaged.
2. Insert and secure the parallel interface connector into the parallel
interface port of your printer.
3. Insert and secure the serial interface connector into the serial interface
port of your printer.
4. Turn on the power switch.
CHAPTER 4 OPTIONS
CHAPTER 4 –5