Verify the network connection in your computer has the proper IP address, on the same subnet, to access the Energy
Monitoring Hub. NOTE: one common mistake is configuring the Laptop IP to the same address as the IP address of the
Energy Monitoring Hub. In order for the laptop and Energy Monitoring Hub to communicate, the IP addresses should
not be identical. (see the basic network config for suggested IP addresses.)
Use the LCD console to run the Network Status test. This will attempt a number of things including a ping query to the
gateway address. If the Energy Monitoring Hub can ping an external machine such as a gateway, the Ethernet port is
most likely connected properly. If the Energy Monitoring Hub does not use a gateway, try adding a gateway address, and
make it the address of your computer.
System Options
Status
The system status page shows the current memory and flash disk utilization values, system up-time, and load average. Also
included on this page are two buttons for
Reboot
and
Shutdown
. It is important to use the shutdown option prior to
removing power from the Energy Monitoring Hub. The LCD console will report the reboot or shutdown status.
Processes
The system process table is shown in both tree and tabular formats. The process list is useful when contacting Leviton
technical support.
Date and Time
The Energy Monitoring Hub keeps time using UTC or Universal time. All log files are recorded in UTC time as well.
Timestamps shown on the Energy Monitoring Hub local configuration pages are converted to local time for the convenience
of the installer. The date/time configuration page provides the following options
Date/time:
In UTC and Local time.
Date/time:
Dropdown menus to select the current (Local) time manually.
Timezone
: A drop down list of the supported time zones.
Time sync protocol:
Select NTP or Rdate. Most Linux/Unix systems provide Rdate, however many provide NTP as well.
Windows domain servers can also provide NTP. If possible use NTP as it is a more robust protocol.
Time Server:
Specify the DNS name or IP address of your time server. The default “time.Leviton.com” can be used if the
Energy Monitoring Hub has a connection to the Internet. The Energy Monitoring Hub will attempt to synchronize time with
the time server every time an upload session. This will ensure that the clock is checked and adjusted at a minimum of once
per day. Typically, the synchronization will align the clock to -1 second of the internet time source or atomic clock.
You may need to verify if your firewall will allow NTP or Rdate packets to pass through. Generally, it is better to use a
local time server if possible. The time server time.Leviton.com supports both NTP and Rdate time protocols. If you use a
GSM connected system, you will probably need to use Rdate. NTP is blocked by many cellular service carriers.
Universal Time Is Your Friend
Log data is stored in UTC time. This allows data collection services such as LEM to collect data from multiple sites in
different time zones. If you are operating your own database system to store log data from the Energy Monitoring Hub, it is
best to store the data in UTC time in the database as well, and only convert it to local time when generating the final report
or graph for the user.
If you store data in Local time, you will have the following issues.
1)
Local time is relative. Is Local the time where the Energy Monitoring Hub exists or Local to where the data is stored? If
local to the Energy Monitoring Hub, you must shift each Energy Monitoring Hub data set depending on its location.
2)
There are about 11 time zones in the US. Some observe DST, others do not. These include Alaska, Aleutian, Arizona,
Central, Eastern, Hawaii, Indiana, Michigan, Mountain, Pacific, and Samoa.
3)
When converting to local time, there will be one hour of overlapping data in the fall when the time is adjusted for
Daylight Savings time. ie, log entries run 12:45, 1:00, 1:15, 1:30, 1:45, 1:00, 1:15, 1:30, 1:45, 2:00am. This will prevent
you from sorting your data by time in your database.
4)
In the spring, you will have a gap in the data from 1:59 to 3:00am. This can cause problems if you are calculating
demand values based on consumption.
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