The controllers are for use in VAV (Variable Air Volume) and Unitary HVAC control applications. Each controller communicates via LonWorks(R) or BACnet MS/TP network communications. Each controller provides flexible, universal inputs for external sensors, digital inputs, and a combination of analog outputs and digital Triac outputs. The Sylk Bus is included in each controller which enables connection to other Sylk enabled devices. These controllers provide many options and advanced system features that allow state-of-the-art individual room control. Each controller is freely programmable and configurable. Direct BACnet (MSTP) connection.