System and method for server based control

A device for use with a network that uses a single wire pair, the wire pair concurrently carrying Direct Current (DC) power and bi-directional digital data signals that is carried over a frequency band above and distinct from the DC power using Frequency Division Multiplexing (FDM), the device comprising:

• a software and a processor for executing the software;
• a connector for connecting to the wire pair;
• a transceiver coupled between the processor and the connector for transmitting digital data to, and receiving digital data from, the wire pair via the connector;
• a sensor for sensing a first phenomenon, the sensor having an output coupled for transmitting to the processor a value responsive to the first phenomenon;
• an actuator for affecting a second phenomenon in response to an actuator command from the processor;
• and
• a single enclosure mountable for housing the connector, the processor, the actuator, and the transceiver,
• wherein the transceiver, the actuator, and the processor are coupled for being powered from the DC power via the connector,
• wherein the device configured to transmit the value to the wire pair via the connector, and
• wherein the device is addressable in the network using a digital address.