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Modbus Poll, developed by Witte Software , is a widely used industrial communication tool. As of early 2026, licenses purchased after January 1, 2019, support the latest versions (v13+). The software is known for its ability to simulate a Modbus Master, allowing for the testing of Modbus TCP/IP or RTU/ASCII devices, including PLC/SCADA systems. modbus poll license key top

Ensure you have the latest version installed. The software is known for its ability to

Quick register reading/writing with a clean graphical interface. Open-Source (Free) Lightweight, multi-register charting and logging. Free Windows Utility ModbusPal Advanced slave simulation for testing master devices. Open-Source (Free) pymodbus (Python Library) Open-Source (Free) Lightweight

Modbus Poll is arguably the most widely used Modbus master simulator designed for industrial automation professionals, engineers, and developers. It allows users to simulate Modbus slave devices to test, debug, and monitor PLC systems and field instruments.