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pyModSlave is a free python-based implementation of a ModBus slave application for simulation purposes. You can install the python module or use the precompiled (for Windows only) stand alone GUI (Qt based) utility (unzip and run). pyModSlave also includes a bus monitor for examining all traffic on the bus. You can also download it from pypi <https://pypi.org/project/pyModSlave/>.
...Source code is availiable for Windows and Linux for compilation using Qt <http://www.qt.io/download>.
Check out my modbus slave project <http://sourceforge.net/projects/pymodslave/>.
Checkout the following youtube videos :
<https://www.youtube.com/channel/UC3Tk2gE-KGtwOq8WWmb2R7g>