Advantech AIMB-501 User Manual page 54

To "enable" or "disable" Serial Port 3.
Change Settings

To select the IO address/IRQ 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
To "enable" or "disable" Serial Port 4.
 Change Settings
To select the IO address/IRQ setting for serial port 4.
AIMB-501 User Manual 44