Connecting the serial communications port
CAUTION: Use only the computer interface cable supplied with the UPS to connect the communications
port to the host computer.
IMPORTANT: Power protector software requires the communications port to be appropriately cabled to
the host computer.
NOTE: This port is only used for firmware upgrades. To update the UPS firmware, see the Hewlett Packard
Enterprise website.
Connecting the RPO port
WARNING: To meet the requirements stated in NEC (NFPA 70) Articles 645-10 and 645-11, a UPS
installed in a computer equipment room must be connected to an RPO circuit.
IMPORTANT: The remote switch must be in the Off (open) position to enable power to the output
receptacles.
NOTE: Wire the connector block using stranded, nonshielded wire (AWG #22 - #18, or equivalent).
Separate wire pairs are attached to a single, normally open contact in a parallel connection. Hewlett Packard
Enterprise recommends using different colors for the positive and negative wires.
If a connector becomes disconnected and is reconnected with reversed polarity, an RPO is initiated. To avoid
RPO port disconnect:
18 Installation
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