RGB-621-R1 RGBCCT Module

Overview

The RGB-621-R1 is a configurable smart RGB+CCT LED controller designed for architectural lighting, home automation, ambient lighting, and industrial control. With 5 high-current PWM outputs for RGB and Tunable White LED control, 2 isolated digital inputs, and 1 relay output, it offers professional lighting control and seamless integration via Modbus RTU (RS-485). Ideal for smart homes, commercial lighting, and automation systems.

Getting Started

Quick Setup Process

1. Mount & Wire – Install on 35mm DIN rail, connect 24V DC power, sensors, and relay loads.

2. Configure – Plug in USB-C, open the WebConfig tool in Chrome/Edge, set Modbus address and I/O mapping.

3. Integrate – Connect to your controller via RS-485 and start automation.

What You Need

• RGB-621-R1 module

• 24V DC SELV power supply

• 24/12V DC SELV LED strip power supply

• RS-485 cable (twisted pair)

• USB-C cable for configuration

• 24/12V RGB+CCT LED strips

• Chromium-based browser (Chrome/Edge)

Web Configuration Steps

1. Connect USB-C to module and PC

2. Open https://www.home-master.eu/configtool-rgb-621-r1

3. Click "Connect" and select serial port

4. Set Modbus address (default: 3) and baud rate (default: 19200 8N1)

5. Configure input actions, relay mapping, LED modes, and button functions

6. Settings save automatically to flash

Tech Specs

Documentation

The DIO-430-R1 is open-source hardware! You can build your own board using the following files:

Hardware Design Files

• MCU Board Schematic: RGB-621-R1-MCUBoard.pdf

• Field Board Schematic: RGB-621-R1-FieldBoard.pdf

• System Block Diagram: RGB_DiagramBlock.png

• MCU Pinout Diagram: RGB_MCU_Pinouts.png

• Field Board Layout: RelayBoard_Diagram.png

• MCU Board Layout: MCUBoard_Diagram.png

Firmware & Software

• Firmware Source Code: RGB-621-R1/Firmware/

• WebConfig Tool: ConfigToolPage.html

• ESPHome Integration Package: default_rgb_621_r1_plc/

Mechanical Files

• Dimensional Drawing: RGB-620-R1Dimensions.png

All design files and documentation are available in the HomeMaster GitHub repository.

Input and Output

Digital Inputs:

• Type: Galvanically isolated (ISO1212)

• Compatibility: Dry contact or 24V sourcing

• Protection: PTC fuses + TVS diodes per channel

PWM Outputs:

• Driver: AP9990GH-HF N-channel MOSFETs

• Control: 0-100% duty cycle (0-1000 scale)

• Protection: PTC fuses, reverse polarity protection

Relay Output:

• Type: HF115F mechanical relay

• Control: Modbus coil or local mapping

• Application: LED driver switching, auxiliary loads

User Interface

• 2 Buttons: Configurable for relay override (toggle function)

• 2 LEDs: Configurable steady or blink modes, linked to relay status

• Status LEDs: PWR (power), TX/RX (Modbus activity)

Communication Interfaces

• Protocol: Modbus RTU

• Role: Slave device

• Default Settings: Address 3, 19200 baud, 8 data bits, No parity, 1 stop bit

• Supported Functions: Read Coils (0x01), Read Discrete Inputs (0x02), Read Holding Registers (0x03), Read Input Registers (0x04), Write Single Coil (0x05), Write Single Register (0x06)

Modbus Address Map

Coils (Read/Write) - Function Codes 0x01, 0x05

Discrete Inputs (Read Only) - Function Code 0x02

Holding Registers (Read/Write) - Function Codes 0x03, 0x06

Input Registers (Read Only) - Function Code 0x04

Home Assistant & ESPHome Integration Guide

Overview

The RGB-621-R1 integrates seamlessly with Home Assistant via ESPHome using the Modbus RTU protocol. This guide covers both quick integration using our pre-built package and manual configuration for advanced users.

Prerequisites

Before starting, ensure you have:

1. ESPHome device (HomeMaster MiniPLC/MicroPLC or any ESP32/ESP8266 with RS-485)

2. RS-485 connection between ESP device and RGB-621-R1

3. 24V power to RGB-621-R1 module

4. Home Assistant with ESPHome add-on installed

Configure Your ESPHome Device

Add this to your ESPHome YAML configuration:

# RS-485 Configuration
uart:
  id: uart_modbus
  tx_pin: GPIO17
  rx_pin: GPIO16
  baud_rate: 19200
  parity: NONE
  stop_bits: 1

modbus:
  id: modbus_bus
  uart_id: uart_modbus

# Import RGB-621-R1 Package
packages:
  rgb_621_r1:
    url: https://github.com/isystemsautomation/HOMEMASTER
    ref: main
    files:
      - path: RGB-621-R1/Firmware/default_rgb_621_r1_plc/default_rgb_621_r1_plc.yaml
        vars:
          rgb_prefix: "Staircase"  # Custom name for your entities
          rgb_id: staircase_module  # Unique internal ID
          rgb_address: 3  # Must match WebConfig Modbus address
    refresh: 1d

Customize Variables

• rgb_prefix: Appears in entity names (e.g., "Staircase Relay 1")

• rgb_id: Must be unique if adding multiple RGB modules

• rgb_address: Set to match your RGB-621-R1 Modbus address (default: 3)

Multiple DIO Modules

For additional modules, duplicate the package block with unique IDs:

packages:
  rgb_2:
    url: https://github.com/isystemsautomation/HOMEMASTER
    ref: main
    files:
      - path: RGB-621-R1/Firmware/default_rgb_621_r1_plc/default_rgb_621_r1_plc.yaml
        vars:
          rgb_prefix: "Kitchen"
          rgb_id: kitchen_module
          rgb_address: 4
    refresh: 1d

  rgb_1:
    url: https://github.com/isystemsautomation/HOMEMASTER
    ref: main
    files:
      - path: RGB-621-R1/Firmware/default_rgb_621_r1_plc/default_rgb_621_r1_plc.yaml
        vars:
          rgb_prefix: "HVAC"
          rgb_id: hvac_module
          rgb_address: 5
    refresh: 1d

Programming

Supported Development Environments

• Arduino IDE with RP2350 support

• PlatformIO with RP2350 toolchain

• MicroPython (community builds available)

Firmware Flashing

1. Connect USB-C to PC

2. Hold Buttons 1 + 2 to enter BOOT mode

3. Upload via:

   • UF2 drag-and-drop to mounted drive, OR

   • PlatformIO/Arduino IDE upload

4. Power off the module for reset

Pin Mapping (Default Firmware)