See and understand what’s going on : Get Message Explanations, Field Breakdowns and Custom Register Naming.
Ethernet TCP support.
Protocol Simulator for Modbus RTU and TCP.
Link data to Excel or other packages that support DDE
Highly compact. Quick Windows Install/Uninstall
Designed, written and tested in-house by Windows Programmers with years of Modbus experience.
“Simple, Elegant, Efficient & Reliable”

We have found some issues with this early release of Winmodbus Master and are fixing them now. Evaluation version available shortly...

The evaluation version is fully functional for 14 days. After this, a purchase must be made to continue use.
After download, just “Open” the file and it will install on your PC. Once installed, you can run it from the Windows Start Menu
If Windows SmartScreen shows a warning during installation, just click "More Info" and then "Run Anyway". The installer has been checked for viruses/malware and is clean but due to the relatively low volume of installations, Microsoft does not have it in its "clean apps" database.