Printronix SL4M User Manual page 19

c. USB
Attach a USB cable with noise suppresion filters on BOTH ends from
the computer to the USB connector at the back of the printer.
NOTE: The printer supports simultaneous connection of the parallel, serial,
and USB interfaces using the Auto Switching feature. Auto Switching
is described on page 53.
d. NIC Connection
Insert a suitable NIC cable from your hub or switch to the NIC
connector located in the I/O panel in the rear of your printer.
Interface Panel with Ethernet Option
Installation
Ethernet Interface
(optional)
Parallel Interface
USB Connection
Serial Interface
RS-232
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