Recent content by NigelH

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    Modicon Modbus Protocol Guide (PI-MBUS-300) RTU CRC calculation description correction

    OK thanks, that defence makes sense. In the old days the bit shifted out could well have ended up in a carry bit easy to test in assembly code. I realise it is a pretty academic and obscure point after all this time but I couldn't see what was wrong with my implementation (which tested the LSB...
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    Modicon Modbus Protocol Guide (PI-MBUS-300) RTU CRC calculation description correction

    There are many correct 'C' routines published for Modbus RTU CRC calculation. However if for you want to implement the procedure in another language (Power Basic for example) and implement it from the documented description of Modbus RTU CRC calculation in the Modicon Modbus Protocol guide...
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