Opentherm to Modbus gateway

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  • UniPi-2015036
  • 2015036
Opentherm to Modbus gateway module allowing control of OpenTherm boiler with...more
Product information "Opentherm to Modbus gateway"

Opentherm to Modbus gateway module allowing control of OpenTherm boiler with UniPi v 1.1 and UniPi Neuron control units.


Opentherm to Modbus gateway module allowing control of OpenTherm boiler with UniPi 1.1UniPi Neuron and UniPi Axon 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. We recommend connecting this module to UniPi v 1.1 via USB-RS485 Convertor.

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).

Technical Parameter

Power 5-24 V DC
Dimensions 53 mm × 90 mm × 58 mm
Weigth 85 g
Power consumption Max 750 mW
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