The LONWORKS communication system is widely used in building automation systems for field-level and application-level functions for residential and non-residential controls in lighting, sun protection, HVAC, energy management and security applications. The BACnet communication system is also used in building automation systems for management-level and application-level functions. This technical specification defines the methods for combining BACnet networks with LONWORKS networks, and standardizes the interface between BACnet and LONWORKS systems.