With IPHost Network Monitor you can run simple snmp requests against a Liebert device in your network.
psInputLineAVoltage
ps Input Line A Voltage
1.3.6.1.2.1.1.6.1
The AC line A voltage, stored as mV. The integer 2147483647 represents invalid value.
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IPHost Network monitor allows you to monitor psInputLineAVoltage on Liebert device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Liebert uninterruptible power sources right now.