Modbus Poll is a widely recognized Modbus master simulator used primarily by developers and engineers for testing and debugging slave devices. While users often search for a "registration key" for specific versions like Modbus Poll 2021, it is essential to understand that this is a professional, product developed by Witte Software . Understanding Modbus Poll Licensing
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: A completely free, command-line based Modbus master simulator available for Windows and Linux. Modbus Poll is a widely recognized Modbus master