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The old FCL-988M cannot be connected to RS485, the newly purchased FCL-988M can be connected to RS485

Details of the problem:

Hello, the old FCL-988M cannot be connected to RS485, but the newly purchased FCL-988M can be connected to RS485, what is the reason? Hope to get an answer, thank you.

Expert answer:

Hello, it is judged that the old FCL-988M communication module is faulty, please contact the corresponding salesperson and send it back to the manufacturer for repair.

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