The T3-TB is a gateway device with modbus, bacnet, with options for zigbee or GSM/CDMA modem to operate over mobile networks. Modbus and Bacnet packets can be routed over any of the many communications ports. The device holds the schedules for the zones acting as a master time clock. Recent updates include a dyndns client for remote access over the net. You can program logic for the building in a control ‘basic’ like text editor. Use this to manage a network of thermostats and general purpose I/O modules. Add your own graphics, alarms and trend logs.
Schematics and customized OEM versions are available on request.
The data sheets are here: https://www.temcocontrols.com/t3-nc-network-controller.htm
The github source code for the front end is here: https://github.com/temcocontrols/Bacnet_Modbus_Gateway