IDP/ARK-2151S/RS-485

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1. Enable RS-485 in BIOS

 Advanced -> IT8768 Super IO Configuration -> Serial Port 1 Configuration -> Choose Serial Port Mode [ RS-485 Mode ]
                                                                         -> Auto Flow Control [ Enable ]
 Advanced -> IT8768 Super IO Configuration -> Serial Port 2 Configuration -> Choose Serial Port Mode [ RS-485 Mode ]
                                                                         -> Auto Flow Control [ Enable ]