While you mentioned "2021," licenses are generally sold for the current major version. A license bought today typically covers the latest updates (e.g., Version 12), which features a new XML file format for human-readable configurations.
You can use the software for evaluation purposes for 30 days at no charge. During this period, the connection will automatically disconnect every 10 minutes , requiring a software restart. registration key modbus poll 2021
: A completely free, command-line based Modbus master simulator available for Windows and Linux. While you mentioned "2021," licenses are generally sold