NEC Express 320Lc-R - Manual (Page 43)

Installing Server 3-11
To connect the power cords from the server to an uninterruptible power supply (UPS), use service
outlets on the rear of the UPS.
The UPS service outlets are categorized into two groups: SWITCH OUT and UN-SWITCH OUT.
(They may be called "OUTPUT1" and "OUTPUT2".)
For constant power supply, connect the power cords to a UN-SWITCH OUT outlet. (Connect the
modem that is in service for 24 hours to this outlet.)
When the power cords from the server are connected to a UPS, change the BIOS setup of the server
to link with power supply from the UPS.
Select [AC-LINK] from [System Hardware] on the BIOS setup utility and change parameters. See
the separate volume of User’s Guide for details.