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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/>.
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>.
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...The graphical interface (QT4) includes plotting (matplotlib), instrument configuration/monitoring and a program step creator. The communication with the hardware is independent of the GUI and any number of devices can be selected. To modify the code for any other task only the hardware interface needs to be redefined.
...It permits to execute adaptors composed of sources, pipes (transformations) and sinks.
Connectivity with : JMS,HTTP,SOAP,UDDI,FTP,Xindice,JDBC,Jabber,SMTP...
XML Support : XSLT, Xpath.
Has GUI for