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No legitimate, free, permanent registration key exists for Modbus Poll outside of the official purchase process. The trial is the only legal free option. Anything else is either obsolete, revoked, or malicious.
: You can purchase a legitimate license directly from Modbustools.com . Registration Key Modbus Poll
: Manually compose and send custom test strings to debug specific or non-standard device responses. Free Trial vs. Registered Version Modbus Poll is available for download at ModbusTools.com . The unregistered version operates in a 10-minute trial mode No legitimate, free, permanent registration key exists for
Select (this option appears if the software is not yet registered). : You can purchase a legitimate license directly
Modbus Poll is not free software. While you can download an evaluation version for free, it comes with significant limitations designed to encourage professional licensing:
16 Feb 2026 — Each cell can be individually formatted. Available formats include: Signed 16-bit register. Unsigned 16-bit register. Hexadecimal. Modbus Tools Modbus Poll quick start guide