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Note: The project has moved to https://github.com/pyhys/minimalmodbus The files available here are very old, download from Github instead.
MinimalModbus is an easy-to-use Python module for talking to instruments (slaves) from a computer (master) using the Modbus protocol, and is intended to be running on the master. Example code includes drivers for Eurotherm and Omega process controllers. The only dependence is the pySerial module (also pure Python).
Software and Arduino shield design for a Serial-to-HID device such that old serial gaming devices can be used as USB Hid devices, particularly the SpaceOrb360 and Spaceball 3d CAD devices.