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2.4 Communications
2.4.1 COM Ports
Nfinity is able to communicate through multiple communication
ports simultaneously. Use only Liebert-provided communication
cards. Connect only Signal Edge Low Voltage (SELV)/Class 2 cir-
cuits when connecting to any communication port.
There are two DB-9 COM ports available on the rear of the Nfinity.
COM1 - Relay Contacts
Relay contacts are available through a DB-9F communications connector. Contact closure provides
the following:
These contacts are rated 48 VDC, 1 amp maximum and are compatible with Liebert MultiLink™
software.
COM2 - Serial
Nfinity is able to communicate via Liebert proprietary protocol. This communication port can be used
for serial communication with Liebert MultiLink software. For more detailed information, please see
the MultiLink software documentation on the CD shipped with the Nfinity. The pin-out configuration
of the DB-9 connector is:
2.4.2 Intellislot™ Ports
The following communication cards may be used with Nfinity:
• Intellislot OpenComms Web Card—allows
the Nfinity to communicate intelligently with
your Ethernet network. The OpenComms Web
Card must be installed in port 1.
• Intellislot MultiPort4 cards—allows up to
four client computer systems to monitor the sta-
tus of Nfinity simultaneously.
• Intellislot Relay Contacts cards—provides
contact closures for remote monitoring of alarm
conditions; On Battery, On Bypass, Low Battery,
Summary Alarm, UPS Fault and On UPS
signals.
Pin Assignment
1 Low Battery (normally open)
4 UPS shutdown in battery mode
(5-12 V DC for 1.5 sec)
5 Common
7 Low Battery (common)
8 On Battery (common)
9 On Battery (normally open)
Pin Assignment
2 Transmit Data
3 Receive Data
5 Common
54321
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Pin Assignment
Port 1 Port 2 Port 3 Port 4
COM 1 COM 2