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failed to load 'plugin.py', Python Path used was '/home/pi/domoticz/plugins/Drexel/:/usr/lib/python35.zip:/usr/lib/python3.5:/usr/lib/python3.5/plat-arm-linux-gnueabihf:/usr/lib/python3.5/lib-dynload'.
2018-04-25 18:09:24.955 Error: (Test) Module Import failed, exception: 'ImportError'
2018-04-25 18:09:24.955 Error: (Test) Module Import failed: ' Name: minimalmodbus'

2018-04-25 18:43:18.300 Error: (test2) 'onHeartbeat' failed 'ValueError'.
2018-04-25 18:43:18.301 Error: (test2) ----> Line 93 in /home/pi/domoticz/plugins/Drexel/plugin.py, function onHeartbeat
2018-04-25 18:43:18.301 Error: (test2) ----> Line 64 in /home/pi/domoticz/plugins/Drexel/plugin.py, function onHeartbeat
2018-04-25 18:43:18.301 Error: (test2) ----> Line 325 in /usr/lib/python3.5/minimalmodbus.py, function read_long
2018-04-25 18:43:18.301 Error: (test2) ----> Line 697 in /usr/lib/python3.5/minimalmodbus.py, function _genericCommand
2018-04-25 18:43:18.301 Error: (test2) ----> Line 798 in /usr/lib/python3.5/minimalmodbus.py, function _performCommand
2018-04-25 18:43:18.301 Error: (test2) ----> Line 1075 in /usr/lib/python3.5/minimalmodbus.py, function _extractPayload

You can also manually download the compressed source files from https://pypi.python.org/pypi/MinimalModbus/ (see the end of that page). In that case you first need to manually install pySerial from https://pypi.python.org/pypi/pyserial.

There are compressed source files for Unix/Linux (.tar.gz) and Windows (.zip). To install a manually downloaded file, uncompress it and run (from within the directory):

python setup.py install
or possibly:

sudo python setup.py install
If using Python 3, then install with:

sudo python3 setup.py install
For Python3 there might be problems with easy_install and pip. In that case, first manually install pySerial and then manually install MinimalModbus.

To make sure it is installed properly, print the _getDiagnosticString() message. See the Support section for instructions.

You can also download the source directly from Linux command line:

wget https://pypi.python.org/packages/source ... 0.7.tar.gz
Change version number to the appropriate value.