The NT-IPXB network controller supports up to 32 Net/X thermostats and is a direct replacement for the NT-SSA16/CLK and NT-SSA32/CLK. The controller includes a real-time clock/calendar that allows simple, yet robust control of XBUS wired and StrongMesh wireless Net/X systems. Additionally, the NT-IPXB controller enables simple integration with any control system or automation system via the simple Net/X API protocol. Connectivity using a standard RJ45 jack for 10/100Mbps Ethernet is included and screwless terminals are integrated for easy XBus hook up. The unit also includes a real time clock and calendar with battery backup circuitry to keep the clock and calendar accurate during extended power outages.