PyModbus GUI – Modbus Communication with a User Interface

Overview

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.

Features

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

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1️⃣ Installation

🔹 Prerequisites

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

python --version

🔹 Clone the Repository

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

🔹 Install Dependencies

Run the following command to install the required packages:

pip install -r requirements.txt

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2️⃣ How to Run the Application

🔹 Run the GUI

To start the PyModbus GUI, execute:

python main.py

🔹 Modbus Connection Settings

• 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)

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3️⃣ Usage Guide

🔹 Connect to a Modbus Device

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

🔹 Read Registers

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

🔹 Write Registers

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

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4️⃣ Folder Structure

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

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5️⃣ Requirements File (requirements.txt)

Ensure you have all necessary dependencies installed:

pymodbus
tkinter 
pyserial

Install them with:

pip install -r requirements.txt

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6️⃣ Troubleshooting & Common Issues

🔹 No Response from Modbus Device

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

🔹 Connection Timeout or Failure

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

🔹 "ModuleNotFoundError" for pymodbus or pyserial

• Run:

  pip install pymodbus pyserial

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7️⃣ Future Enhancements 🚀

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

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8️⃣ License

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

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9️⃣ Contribution Guidelines

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

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