Opentherm to Modbus gateway

Opentherm to Modbus gateway module allowing control of OpenTherm boiler with Unipi 1.1, Unipi Neuron and Unipi Patron controllers. The module is a gateway for linking systems with Modbus RTU RS485 (EIA-485) communication and boilers with Opentherm+ (OT+) and thermostats. It allows to either monitor data flow between thermostat and boiler or to control the boiler directly.

Device modes

• Monitor: module is only monitoring communication between boiler and thermostat
• Controller: in this mode, it is also possible to control the parameters of the boiler by writing to Modbus registers

Modbus RTU RS485

• Configurable address
• Speed 9.6 / 19.2 kbps
• Parity E / N
• Optional use of terminating resistor
• Up to 7 gateways in one Modbus line

Functions in monitoring mode

• OT boiler and thermostat interconnection
• Extending the OT communication channel

Communication Module MM-OT101 is mostly used for control and monitoring of OpenTherm boilers in HVAC (Heating, Ventilation, Air Conditioning) and energy management systems. It uses 5-24V DC power supply and can be mounted onto DIN rail (35 mm).