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Analog values in Modbus protocol

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Romulo Rodriguez

You have to convert the byte array of the reply from the plc to an analog number. Make sure the number the plc is sending is an integer value or a real floating point value. If what you get is a floating point value it seems that you have to use the IEEE 754-1985 algorithm to make the conversion. Google it or take a look on what the wikipedia says:

http://en.wikipedia.org/wiki/IEEE_754
 
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