Python Modbus Data Logger (GUI Source Code)

🛠️ UPGRADE: This is the definitive Modbus RTU Logger package.

We built this tool to solve the biggest headache in automation: GUI freezing during high-frequency serial polling, and the complexity of testing non-standard devices.

The value of this package is not just the code, but the time saved on integration and configuration

✨ New in V2.0: Professional Features

• ⚡ Standalone EXE Included: No Python installation required! Just download and double-click the .exe file to run the logger instantly.
• ⚙️ Fully Configurable Serial Port: You can now manually adjust all critical serial parameters directly in the GUI:
  • Baud Rate (9600 - 115200)
  • Data Bits (5-8)
  • Parity (None, Even, Odd)
  • Stop Bits (1, 1.5, 2)
• 🛡️ Multi-threaded Stability: The logging loop is separated from the UI thread, ensuring the application never freezes, even during long, high-frequency data runs.

🔎 Key Capabilities

• Modbus RTU Standard: Supports the required hex command structure, including automatic CRC-16 checksum appending.
• Raw Hex Logging: Logs the raw hex response alongside parsed data to a timestamped CSV file for deep analysis.
• Plug-and-Play: Works with any standard USB-to-RS485 adapter connected to a physical COM port.
• Source Code Access: Clean, well-structured Python source for easy integration into larger SCADA or monitoring projects.

⚡ Save 10+ Hours of Coding: The Ultimate Serial Debugging Tool.

Are you tired of writing the same boilerplate code for every new hardware project?

Building a reliable Serial/Modbus tool with a GUI is harder than it looks. You have to handle UI freezing (non-responsive windows), complex Hex string parsing, and CRC-16 checksum calculations.

I have built a production-ready, multi-threaded Python application so you don't have to start from scratch.

🚀 What Makes This Code Special?

• 🧵 Non-Blocking Multi-threading: The serial reading loop runs in a separate background thread. This ensures your UI never freezes, even when polling devices at high speeds.
• ✅ Auto-Calculate Modbus CRC-16: Forget about manual checksum calculators. The script automatically appends the correct CRC (Little-Endian) to your Hex commands.
• 💾 Instant CSV Logging: Data is automatically saved to soiling_data.csv with precise timestamps, making it perfect for long-term stability testing.
• 🛠️ Native GUI (Tkinter): Built using Python's standard tkinter library. No heavy installations (like Qt) required. It just works.
• 🔌 Plug & Play: Automatically detects available COM ports and handles connection errors gracefully.

👨‍💻 Perfect For:

• Automation Engineers: Quickly test PLCs, Inverters, or Sensors via RS485.
• Python Learners: A perfect example of how to combine tkinter with threading and pyserial.
• Hardware Testers: Log sensor data over 24 hours without writing a single line of code.

📂 What's Inside the ZIP?

• main.py: The complete, fully commented source code.
• requirements.txt: Simple dependency file.
• README.md: Step-by-step setup guide.

💡 Fully Customizable: Since you get the full source code, you can easily modify the parsing logic to fit any proprietary protocol.

Stop debugging your tools. Start debugging your hardware.