Does ADI have loss of GND Solution

The power will leak to the RS485 bus, when the GND of power is lost. this situation may cause the RS485 Bus will not work well.

in my project, my power is 12v input. I want the powe +12v  will not disturb the bus in the situation of "loss of Groud".

Is there anybody who can support the Solution for "loss of Groud"?

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