For decades, the Modbus RTU and TCP protocols have been the backbone of industrial communication. While the protocol itself is open and royalty-free, the used to simulate, test, or bridge Modbus slave devices (often called Modbus Slave Simulators or Gateways) have traditionally relied on simple license keys.
The era of the simple "Modbus slave license key" text string is ending. The new model focuses on . While this adds administrative overhead, it also reduces software piracy and forces vendors to provide better updates. modbus slave license key new
: Licenses are generally perpetual for the specific major version you buy. For decades, the Modbus RTU and TCP protocols
: Licenses are perpetual for a specific major version. Keys purchased after January 1, 2023 , are eligible for a free upgrade to Version 10. The new model focuses on
If you have purchased a new license, follow these steps to register your software: Download/Install: Ensure you are running the latest version from ModbusTools.com Open Software: Launch Modbus Slave. Enter Key: Navigate to the menu, select (or press F3, then enter the key when prompted).