The ZN253 is a fully programmable, native BACnet Advanced Application Controller (AAC) designed for controlling a single zone in a building. The ZN253 is well suited for unit ventilator and packaged HVAC applications that require multiple analog outputs for modulating valves or dampers. It communicates on an EIA-485 LAN using BACnet MS/TP or BACnet over ARCNET communications and connects seamlessly to the WebCTRL® building automation system.