: Running a compromised simulator on a machine connected to an Operational Technology (OT) network can expose your entire industrial control system (ICS) to cyberattacks.

transitioned to an open-source model years ago. The source code and older versions are hosted on platforms like SourceForge

: Supports both Modbus RTU (Serial RS-232/RS-485) and Modbus TCP/IP (Ethernet) connections.

If your work specifically requires a licensed tool with official support, you might be confusing ModRSSim with these paid alternatives: Предназначение и запуск ModRSSim

If you are having trouble with the original version, there are community-updated iterations:

Includes a diagnostics screen to monitor real-time traffic for Modbus commands and responses.