Patent ID: 8977794
Filing Date: 2015-03-10
Classification: F24F,G05B,Y02P

Abstract:
1. An HVAC data processing and communication network, comprising: a data bus having a plurality of HVAC devices coupled thereto, forming a subnet; and a first subnet controller integral with a system device of said plurality of HVAC devices and configured to transition from a reset state to a first state that includes pre-startup tasks, transition from said first state to a second state that includes arbitrating with at least a second subnet controller coupled to said data bus to determine an active subnet controller for controlling said subnet, and transition from said second state to a third state that includes operating as said active subnet controller or as a passive subnet controller of said subnet based on said arbitrating, wherein said first state further includes sending start-up messages to at least some of said plurality of HVAC devices and said third state includes waiting for configuration parameters from said active subnet controller when operating as said passive subnet controller.