*Pssst!*
While waiting for Kevin to get permission to include this in some future v8.3.x, you can use my Modbus driver in Edge (cheap!).
/shameless plug
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Oh my god I didn't know that!
Thanks to mention. Our clients need this functionality for long time for connecting to DCS system which always are modbus master.
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Note that if you buy either of my driver modules for Edge, I take the opportunity to also inject a whitelist for my Integration Toolkit. So you can use that in Edge, also. 
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