There are multiple ways to provide power to SmartNode.
Using Power-over-Ethernet
SmartNode may be connected to a Power-over-Ethernet (PoE) Switch to provide power. Using this option allows SmartNode to both be connected to the network and receive power over the same Ethernet cable.
This is a popular option in modern installations that use PoE switches and/or when installing SmartNode in a DIN-Rail enclosure that does not have access to mains voltage.
Using External DC Power Input
SmartNode can be powered by a DC Input if desired. This option is useful if Power-over-Ethernet is not available, or SmartNode is being used without a network connection.
See Specifications for more information about DC Power Input.
Using PoE Without Ethernet
SmartNode can be powered via PoE by attaching a PoE Injector to the Ethernet jack, even though no Ethernet network is connected.
This strategy may be preferable instead of using DC Input when low-voltage PoE is available and mains voltage for the AC Adaptor is not available.
If both DC Input power and PoE is applied to SmartNode simultaneously, the device prioritizes the use of PoE. When operating with PoE, the DC Input will not be used and draws very little current. If PoE is lost, the device will immediately switch to using DC Input, and will switch back to PoE if restored.
If the DC Input goes above 24.5VDC while both DC Input and PoE are present, then the device will prioritize the use of the DC Input. Although this state is valid, the device will consume both PoE and DC power, increasing energy usage and the device will be warmer.
Do not attach greater than 30VDC to the DC Input jack. Damage to the unit is likely to occur.