Epson RC420 Manual page 100

Setup & Operation 10. UPS (Uninterruptible Power Supply)
(8) Select the "Add a new hardware device", then click the <Next> button.
(9) Select the <Install the hardware that I manually select from a list> option button,
(10) Select the "Ports [COM & LPT]", then click the <Next> button.
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then click the <Next> button.
RC420 Rev.9