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C.Guillo

Float values with modbus

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Hello,

I am developping an application that uses Bronkhorst mass flow controllers with modbus communication. Some years later, I used a vision V570 with success. This time, I am using an Unistream and reading floats with modbus doesn't work properly : the 2 registers are inverted so the value is wrong. I tried to revert the register by using buffers and it works perfectly for read values but values to be written are rounded so I can't send setpoint to my controllers. Does anyone have an explanation ?

Below is a snapshot of the conversion code :

SwapFloat.thumb.jpg.d276438d661536f41c9b85ec3e759ff3.jpg

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In fact, I have solved my problem by storing the result of the conversion in an UINT32 and write it in the modbus register.

Chris.

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