Mini 4O-H

The module has 4xDO (Digital Outputs). DO are NC/NO relay outputs 230 V AC/30 V DC max. 8 A.

The module is factory-equipped with the two most popular open communication protocols: Modbus ASCII/RTU and BACnet MSTP, which are selected using DIP switches.

Addressing the modules is done via rotary switches, which facilitates and accelerates the process of commissioning the system.

The built-in mini USB allows for initial configuration of the unit without power supply.


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Key Features

  • Small dimension
  • Manual override switches
  • Built-in 3 light control modes
  • All digital inputs work as fast counters up to 100 Hz
  • Universal inputs have 16-bit resolution which increase the accuracy of measurement
  • Wide range of supported temperature sensors (NTC, PT1000 etc.)
  • Automatic detection of the signal type in the case of universal inputs
  • Digital outputs 230 V AC max. 3 A or 8 A allow direct control without additional relays
  • LEDs indicate the status of inputs and outputs
  • Supports open standards: BACnet or ModBus
  • Built in Modbus Gateway TCP/IP to RS485


  • Communication

    • Interface RS485 half duplex
    • Up to 99 devices on the bus
    • Protocols: Modbus or BACnet
    • Baud rate: 2400 to 115200 bps
  • 4 x Digital Outputs (4DO)

    • Relay output (NC/NO) max. 8 A, 230 V AC/30 V DC
  • Platform

    ARM Cortex-M3

  • Housing

    • Dimension: 35x110x62 mm
    • Construction: plastic, self-extinguishing (PC/ABS)
    • DIN rail mounting (DIN EN 50022 norm)
    • Cooling: internal air circulation
  • Environment

    • Operating temperature: -10°C to 50°C
    • Storage temperature: -40°C to 85°C
    • Relative humidity: 5 to 95%, no condensation
    • Ingress Protection Rating: IP40 – for indoor installation
  • Power Supply

    • 24 V AC/DC