1. An HVAC data processing and communication network, comprising: a subnet controller configured to control networked devices via a data bus and configured to be addressed over said data bus; an environmental sensor configured to provide environmental data to said subnet controller and configured to be addressable over said data bus independent of addressing said subnet controller; and a user interface configured to provide access by an operator to said network and configured to be addressable over said data bus independently of addressing said subnet controller and said environmental sensor.