IMPORTANT The VCC and the Ground need to be shared by both circuits, otherwise the communication won't work.
You could opto-isolate them instead:
http://www.standardics.nxp.com/products/p82b/datasheet/p82b96.pdf
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Shared VCC isn't required
IMPORTANT The VCC and the Ground need to be shared by both circuits, otherwise the communication won't work.
You could opto-isolate them instead:
http://www.standardics.nxp.com/products/p82b/datasheet/p82b96.pdf