After purchasing, the vendor typically sends a registered version of the executable or a key file to replace the trial version. Calta Modbus Simulator Used heavily for testing SCADA systems.

: Go to the Help menu and select Register (or a similar activation option).

explains how to use data loggers as Modbus servers (slaves) in SCADA networks. Application Note provides steps for configuring Mint-based ASCII slaves. Modbus Tools Warning on "Free" Keys