The industry is moving toward subscription-based and cloud-validated licenses. In 2025, we are seeing the rise of for Modbus slaves.

: A single license can be used by one person on multiple computers, or installed on one computer for multiple users. Simply Modbus RTU/ASCII Slave : Single License : Costs $60.00 for one user or workstation.

But an hour ago, the system had crashed. When it came back up, the Modbus driver was throwing Error 401: Unregistered Device.

: Available for $225.00 , allowing unlimited installations at one company location.

I’ve secured the new license for the Modbus Slave simulator. [INSERT-KEY-HERE] Vendor: [ Witte Software / Simply Modbus ]