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3-Channel Modbus Relay Module with 4 Digital Inputs – RS485 Extension for MiniPLC & MicroPLC

https://www.home-master.eu/web/image/product.template/58/image_1920?unique=3e90d9d

HomeMaster’s 3-Channel Relay Module offers intelligent load control via RS485 Modbus, with 4 digital inputs for wall switches, local control buttons, LED indicators, and open-source programmability.


The HomeMaster 3-Channel Relay Module is a feature-rich RS485 Modbus extension designed for use with MiniPLC and MicroPLC systems. It provides 3 independent relay outputs and 4 digital inputs, enabling versatile control for lighting, appliances, HVAC, or other smart automation functions.

Each relay can switch high-voltage loads, and the 4 opto-isolated digital inputs are ideal for connecting wall switches, sensors, or dry contacts. The device includes manual control buttons for each relay, along with LED indicators for power, relay states, digital input status, and RS485 communication activity.

Built on the ATmega32U4 microcontroller, the module is fully Arduino IDE programmable, allowing customization for advanced behaviors, timers, or integration with other systems.

This module is part of the HomeMaster open-source ecosystem—hardware schematics and firmware are available on GitHub, ensuring transparency, flexibility, and developer freedom

$ 0.00 0.0 USD $ 0.00 Tax Excluded

0.00 lei Tax Excluded

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    Display Name: 3-Channel Modbus Relay Module with 4 Digital Inputs – RS485 Extension for MiniPLC & MicroPLC

    Use Cases:

    • Smart lighting or appliance automation  
    • Scene-based relay switching using wall buttons  
    • HVAC and fan control
    • Integration with MiniPLC or MicroPLC for complex logic  
    • Sensor-triggered load activation  
    • Expansion for smart homes, buildings, and industrial systems  

    Key Features:

    • 3x Relay outputs (16A switching capacity)
    • 4x 24VDC Digital inputs for wall switches or sensors
    • RS485 communication using Modbus RTU protocol
    • Manual override buttons for each relay
    • LED indicators for power, relay states, digital inputs, and communication
    • ATmega32U4-based architecture
    • Compatible with HomeMaster MiniPLC and MicroPLC  
    • Open-source firmware with Arduino IDE support  
    • DIN rail or panel mountable  
    • 24V DC power supply  

    Capabilities:


    • Microcontroller
      ATmega32U4
    • Relay Channels
      3x SPDT relays (NO/NC)  high-performance industrial relays
    • Digital Inputs
      4x inputs (24V DC logic level)
    • Power Supply  
      24V DC  
    • Open Source  
      Firmware and schematics provided via GitHub  


    • Local Control
      3x push buttons for manual relay control
    • Indicators
      Power LED,  3x Relay status LEDs, 4x Input state LEDs, TX/RX LEDs for RS485 activity
    • Communication
      RS485 Modbus RTU (slave)
    • Programming Interface  
      USB (Arduino IDE compatible)  
    • Mounting  
      DIN rail or surface mount