PyModbus GUI is a Python-based graphical user interface (GUI) for communicating with Modbus devices (RTU/TCP). It allows users to read/write Modbus registers, visualize real-time data, and interact with Modbus-compatible industrial devices effortlessly.

✅ Connect to Modbus RTU & TCP Devices
✅ Read/Write Holding & Input Registers
✅ Real-Time Data Monitoring
✅ User-Friendly GUI (Tkinter)
✅ Error Handling & Connection Diagnostics

Before running the application, make sure you have Python 3.7+ installed. You can check your Python version using:

python --version

git clone https://github.com/your-username/pymodbus-gui.git cd pymodbus-gui

Run the following command to install the required packages:

pip install -r requirements.txt

To start the PyModbus GUI, execute:

python main.py

• Modbus RTU (Serial Port)

  • COM Port (e.g., COM3 or /dev/ttyUSB0)
  • Baud Rate (9600, 19200, etc.)
  • Parity, Stop Bits, and Timeout

• Modbus TCP (Ethernet/Internet)

  • IP Address (e.g., 192.168.1.100)
  • Port (Default: 502)

1. Select Modbus Type: RTU (Serial) or TCP (Ethernet)
2. Enter Connection Parameters (COM Port/IP Address, Baud Rate, etc.)
3. Click "Connect"

1. Select Function Code (e.g., Read Coil Registers (FC3))
2. Enter Slave ID, Register Address, and Number of Registers
3. Click "Read" to fetch data

1. Select Function Code (e.g., Write Single Register (FC6))
2. Enter Slave ID, Register Address, and Value
3. Click "Write" to send data

pymodbus-gui/ │── gui/ # GUI-related files │── modbus/ # Modbus communication scripts │── main.py # Main script to run the app │── config.py # Configuration settings │── utils.py # Utility functions (e.g., logging, error handling) │── README.md # Project documentation │── requirements.txt # Python dependencies │── .gitignore # Files to ignore in Git 

Ensure you have all necessary dependencies installed:

pymodbus tkinter pyserial

Install them with:

pip install -r requirements.txt

• Check if the Modbus device is powered on
• Verify the COM port / IP Address & Port
• Ensure Baud Rate, Parity, and Stop Bits match

• For Modbus RTU: Ensure the correct USB-to-RS485 converter is used
• For Modbus TCP: Make sure the firewall is not blocking port 502

• Run:

  pip install pymodbus pyserial

📌 Graphical Data Plotting (Live Charts for Modbus Data)
📌 CSV Export of Modbus Readings
📌 Modbus Coil Status Control
📌 Multi-Slave Support

This project is licensed under the MIT License – feel free to modify and improve it!

Contributions are welcome! Follow these steps to contribute:

1. Fork the Repository
2. Create a Feature Branch

   git checkout -b feature-branch

3. Make Changes & Commit

   git add . git commit -m "Added new feature"

4. Push & Create a Pull Request

   git push origin feature-branch

5. Open a Pull Request (PR) on GitHub