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Modbus RTU Helper
Build Modbus RTU frames, append CRC bytes, and exchange them over a local serial port.
Function note
Read one or more holding registers.
Payload preview
00 10 00 02
Request fields look valid for the selected Modbus function.
Frame with CRC (little-endian CRC bytes)
01 03 00 10 00 02 C5 CE
Local COM port transport
Uses the browser Web Serial API to write the Modbus RTU request and collect response bytes until the timeout expires. Presets cover common Modbus line settings.
Disconnected
Chromium-based browsers only. This requires a secure origin such as HTTPS or localhost and user permission to open the serial port.
Response bytes
No response captured yet.
Decoded response
Normal and exception responses will be parsed automatically after a request completes.