Modbus guides

Guides explain how to do a specific task. If you’re trying things for the first time, start with the tutorials.

Guide	Read it when you want to
The simulator GUI	Learn the six tabs, the Project menu and the status line messages
Headless runs and scenarios	Run servers from CI or scripts, build regression tests, or handle project files
The MCP server	Call Modbus commands from AI tools
Configure serial ports	Choose RTU/ASCII settings, port names, virtual serial ports, USB adapters, wiring and timeouts
JSON command reference	Look up the members of commands, configurations, data models, traces and projects
Use the SDK from Qt and MFC	Use the SDK from worker threads in a GUI application

The C, C++ and .NET functions and types are in the API reference.