{ "items" : [
    { "id" : "http://dbpedia.org/resource/Direct_digital_control"
      "properties" : {
        "http://www.w3.org/2000/01/rdf-schema#comment" : [ "Direct digital control (DDC) is the automated control of a condition or process by a digital device (computer). DDC is considered by many to be a more modern, granular and responsive update to older HVAC control systems based upon PLC technologies. In those older PLC based systems, each zone was self-sufficient and contained all of the instrumentation and control elements needed to consider analog and digital inputs and then take actions according to rules."] } } }
