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dafontem

Real number byte order

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I am reading values via rs-485, and am correctly reading and displaying these values on the unistream. However, I need to pass these values on to a building management system via Modbus tcp over ethernet. I have no issue communicating with the system, and I believe the system is correctly reading integer values from the unistream. The issue I run into is with real numbers. For one thing I can't seem to find anywhere that says what the default byte order is for real numbers (big endian, little endian) or how to change that, which I believe is at least a large part of the problem. I have been stuck on this problem for over a week so any feedback would be great. 

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Hello,

If when the system reads the Real number you are not getting the correct value , you can swap the bytes  to other register and then link this register to the MODBUS.

you can find the swap ladder element in Logic menu:

image.png

image.png

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