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SN65HVD82: How to handle ESD protection for isolated RS-485 circuit in DC system ?

Part Number: SN65HVD82

Hello~

My product is powered by external AC/DC power so there are two wires (+/-) in the input.

There is a isolated RS-485 circuit in the product like below :

The question is :

My system is DC system and no Earth Ground in it.

How will I protect Data Line A/B even if I put TVS on them?  What should TVS be connected to ?

Thanks in advance.