Modbus Logger: RTU+TCP support,8 decoding formats,Modbus exception handling

What makes this different from free tools 🔌 RTU + TCP in one tool Free Modbus tools usually do one or the other. This handles both, with a tabbed interface — switch between Serial RTU (RS-485) and Modbus TCP (Ethernet) in two clicks. Same UI, same CSV format. 🧮 Real register decoding (not just hex dumps) Pick from 8 decoding formats: uint16, int16, int32/`uint32`, float32 (AB CD), float32 (CD AB) for Schneider/Siemens/ABB, plus raw hex and ASCII. Change the format on the fly while polling — no restart, no reconnection. 🚨 Decoded Modbus exceptions When the slave returns Exception 0x83, the tool tells you it means "Illegal Data Address" — not just a cryptic hex code. All 9 standard Modbus exceptions are decoded, highlighted in yellow, and logged. 🎮 Demo Mode — no hardware required Click the Demo tab, hit Start, and the tool simulates a Modbus device with realistic pump RPM, pressure, and temperature drift (plus occasional exceptions). Build your dashboards offline, train new engineers, or demo your work to a customer without a PLC on hand. 📝 Auto CRC, auto MBAP, auto CSV You enter slave ID + function code + address + count. The tool builds the request, adds CRC for RTU or MBAP for TCP, sends it, validates the response, and writes everything to a timestamped CSV. Open in Excel, import to pandas, send to your customer — done. ⚙️ Form mode + raw PDU mode For 99% of polls, fill in the form. For non-standard function codes or vendor-specific commands, paste a raw hex PDU and the tool handles the framing. 📊 Live polls/sec rate display Confirms your interval is actually being achieved. Useful for tuning busy buses and spotting silent devices.