Printronix T5000 Series Quick Reference Manual page 11

Installation
b. Serial Interface
Attach a suitable serial printer cable from the computer to
the DB-25 RS-232 Serial interface connector at the back of
the printer. For additional information on serial cable wiring,
refer to the User's Manual .
NOTE: The printer supports simultaneous connection of the
Parallel and Serial interfaces using the Auto Switching
feature. Auto Switching is described in the User's Manual .
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