BCM MX680RD - Change Settings [Auto]; COM Mode Select [RS232]

MX680RD User’s Manual
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2.4.6.4.2 Change Settings [Auto]
Select an optimal settings for super IO device
Configuration options: as picture below shown
2.4.6.4.3 COM Mode Select [RS232]
Configure the COM port Mode
Configuration options: [RS232], [RS485 Half Duplex], [RS422 Full Duplex]