Advantech AIMB-582 User Manual page 61

– Change Settings [ Auto ]
To select an optimal setting for serial port 3.
– Auto flow control
When the COM is to set as RS-485, it supports auto flow control function.
 Serial Port 4 Configuration
– Serial Port [Enabled]
To "enable or disable" serial port 4.
– Change Settings [ Auto ]
To select an optimal setting for serial port 4.
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