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QModMaster is a free Qt-based implementation of a ModBus master application. A graphical user interface allows easy communication with ModBus RTU 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.
...pyModSlave is based on modbus-tk <http://code.google.com/p/modbus-tk/>, pySerial <https://github.com/pyserial/pyserial> and pyQt5 <http://www.riverbankcomputing.co.uk>.
Check out my modbus master project <http://sourceforge.net/projects/qmodmaster/>.
Checkout the following youtube videos :
Modbus RTU <https://youtu.be/1get1ELKz_A>
Modbus TCP <https://youtu.be/nX_kTQwK2f4>
Session <https://youtu.be/y_9Di7E3y8w>
Log <https://youtu.be/Xcb6sj1uzyY>