From the developer: "With Modbus Poll you can monitor and test your modbus slave devices. Some of the features: Supports RTU and ASCII mode. Test Center for modbus slave developers. Multiple windows for monitoring of multiple slaves/data areas. Monitoring of serial traffic. Data logging to a text file readable by MS Excel. Multithreated for best performance. Print preview etc. OLE-Automation support for easy interfacing to Visual Basic and Excel. Modbus TCP/IP."