Modbus RTU Smart Analyzer

A client-side Modbus RTU protocol analyzer powered by Web Serial API. Features auto-framing, data type inference, and smart…

[Modbus RTU Smart Analyzer - Industrial Serial Protocol Diagnostics & Debugging Workbench] Modbus RTU Smart Analyzer is a modern, lightweight protocol analysis tool crafted specifically for industrial automation engineers, embedded firmware developers, and SCADA/HMI integrators. Powered by the Web Serial API, it establishes direct communication with physical COM ports and USB-to-RS485 converters without requiring any external backend server, local agent, or heavy software installations. 💡 Key Features & Highlights: 1. ⚡ Live Hardware Streaming (Web Serial API) - Configurable Baud Rates (9600 to 115200 bps), Parity (None/Even/Odd), and Stop Bits (1/2). - One-click native COM port authorization for instant real-time traffic monitoring. 2. 🧩 Intelligent Auto-Framing & Color-Coded Badges - Slices continuous byte streams into valid Modbus frames using sliding-window heuristics and the standard Modbus CRC-16 algorithm. - Distinct Visual Tagging: • [M] Blue: Master Requests • [S] Green: Slave Responses • [M/S] Purple: Write Echo Responses (FC 05 / FC 06) • [EXC] Orange: Modbus Exception Responses • [ERR] Red: CRC-failed noise or corrupted frames 3. 🔍 Offline Analysis & Clipboard Paste Support - Seamlessly paste raw Hex dumps captured from external terminal tools using [Ctrl+V]. - Automatically filters out timestamps, ASCII junk, and delimiters to reconstruct clean packet sequences. 4. 📊 Multi-Format Data Type Inference Table - Bit States (Coils / Discrete Inputs): Highlighting ON (1) in red and OFF (0) in blue. - Register Conversions: Instant decoding into INT16 (signed), UINT16 (unsigned), UINT32 (4 Endianness formats: ABCD, CDAB, BADC, DCBA), and IEEE-754 FLOAT32 with noise filtering. - Extended Function Support: Full structural breakdown for FC 21 (0x15) Write File Record. 5. 📈 Smart Quality Diagnostics Dashboard - Real-time aggregation of Total Requests, Valid ACKs, Timeouts, CRC Errors, and Communication Success Rate. - Actionable Diagnostic Guidance: Provides instant suggestions for bus termination, EMI interference, baud rate mismatch, or slave address discrepancies. 6. 🛡️ 100% Client-Side & Zero-Telemetry Privacy - Operates entirely within your local browser sandbox. Zero serial payloads or industrial data are ever transmitted to external servers. -------------------------------------------------- 🌐 Standalone PWA Installation: In addition to this Chrome extension, the tool is also available as a standalone Progressive Web App: 🔗 Install PWA: https://rtuanalyze.uwebhmi.com/pwa