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Arduino Mega to a Unistream HMI/PLC via MODBUS

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Good day All 

Im wondering if someone will be able to assist me with the following.

we have a few in house built machinery that runs off Arduino Controllers. We needing to link it up to a Unistream HMI to Display the Data. I know it can be done via Modbus. 

Im just needing some help with the initial Modbus from Arduino to Unistream setup


Please Assist where you can 

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Hi Andrew,

exist many arduino library to use modbus RTU or TCP protocol..both master and slave...then how do the sketch depends on which library you will choose.

each library include examples and someone also a manual...pay attention that Arduino MEGA doesn't has a native RS485 or ethernet port then you will need some extra board (usually cheap).

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