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Metz ModBus MR-DO 4 Relay Output Module

SKU: Metz ModBus MR-DO 4 Relay Output Module


The Modbus MR-DO4 module with 4 digital outputs was developed for decentralized switching tasks. It is suitable for switching electrical components, such as motors, contactors, lamps, louvers, etc. In this case it is necessary to protect the relay contacts by appropriate load-dependent measures. The module is provided with a manual control for manually switching the relays. The outputs can be switched by means of standard registers via a Modbus master. Module address, bit rate and parity are set with 2 rotary switches on the front or by software. Suitable for decentralized mounting on DIN TH35 rail according to IEC 60715 in electrical distribution cabinets The MR-DO4odule can also be connected to NZ/AUS/EU LoRaWAN networks over the LoRa ModBus Transceiver. It is also available with BACnet MSTP and can be integrated via  IQnexus IoT Platform into Building Automation, Energy-Management and SCADA.


  • Mounting on a 35 mm DIN rail
  • Simple integration into the LVD Board
  • RS485 ModBus RTU Slave
  • Easy to configure
  • IQnexus IoT platform for LoRaWAN

See it in action

See below real life use cases for the ModBus MR-DO4, please contact us if you want to find out how to install or implement your smart Modbus modules using the IQnexus LoRaWAN ModBus Master Transceiver.