Chapter 3: Using the Web Interface
56
When the PDU detects that a temperature sensor's reading drops below 20 degrees Celsius, moving from the "above
upper warning" range to the "normal" range, either of the following may occur:
•
If the temperature falls between 20 and 17 degrees Celsius, the PDU does NOT perform the "deassertion" action.
•
If the temperature drops to 17 degrees Celsius or lower, the PDU performs the "deassertion" action to announce the
end of the "above upper warning" state.
Peripherals
If there are environmental sensor packages connected to the PDU, they are listed on the Peripherals page. For more
information, refer to the PDU with RackLink Environmental Sensors User Manual at
www.middleatlantic.com/resources/power-downloads.aspx
An environmental sensor package comprises one or some of the following sensors/dry contacts:
•
Numeric sensors: Detectors that show both readings and states, such as temperature sensors.
•
State sensors: Detectors that show states only, such as contact closure sensors.
•
Dry contacts: A dry contact controls a system or mechanism so it shows states only.
The PDU communicates with
managed
sensors/dry contacts only and retrieves their data. It does not communicate with
unmanaged ones. See
Managed vs. Unmanaged Sensors/Dry Contacts
(on page 62).
When the number of "managed" sensors/dry contacts has not reached the maximum, the PDU automatically brings newly
detected sensors/dry contacts under management by default.
One PDU can manage a maximum of 32 sensors/dry contacts.
Note: To disable the automatic management function, see How the Automatic Management Function Works (on page 187).
You need to manually manage a sensor/dry contact only when it is not under management.
When any sensor/dry contact is no longer needed, you can unmanage/release it.
Open the Peripherals page by clicking Peripherals in the
(on page 26). Then you can:
