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QModMaster is a free Qt-based implementation of a ModBus master application. A graphical user interface allows easy communication with ModBusRTU and TCP slaves. QModMaster also includes a bus monitor for examining all traffic on the bus.
QModMaster is based on libmodbus <http://www.libmodbus.org/> for modbus communication and on QsLog <https://bitbucket.org/codeimproved/qslog> for logging. Supports both Windows and Linux.
For Windows a pre-compiled binary is availiable. It does...
Cinterion (Siemens) TC65 Java applet for tunneling RS-232 serial communication (MODBUS/RTU, GPS data etc) over GPRS/Internet. Works fine together with com0com SourceForge project.