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ModBus RTU Analyzer

The ModBus RTU Analyzer can be attached to any Serial- or TCP-based stream session for analysis of the ModBus frames being sent back and forth.

Whenever ModBus frames are detected and parsed, human-readable desciptions will be printed in the log — side-by-side with the original data bytes. Nothing is lost — ModBus decoded messages complement the original raw data, not replace it.

Moreover, it's always possible to remove the ModBus Analyzer layer and get back to the raw, unprocessed data streams.

Monitoring ModBus RTU over Serial RS-232

This plugin is quite useful in its own right, but it also serves as an example for how to implement protocol analyzers using IO Ninja scripting — you can use it as a starting point for your own protocol analyzer.

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