Change Serial Port Mode - SMART System

The SMART Controller has two serial ports that support RS-232, RS-422, and RS-485. You can configure the active mode for each port using the SMART Controller BIOS.

1. Connect a monitor and keyboard to the SMART Controller.
2. Reboot the SMART Controller into the Aptio Setup Utility.

   Procedure

   1. Press the Power button to shut down the SMART Controller.
   2. Once the SMART Controller is powered off, press and hold the Escape key on your keyboard and press the Power button again. Continue holding Escape until the Aptio Setup Utility is displayed.

      Aptio Setup Utility
      
      Main  Advanced  Chipset  Security  Boot  Save & Exit
      ------------------------------------------------------
      
      BIOS Information
      
      BIOS Vendor           American Megatrends
      Core Version          5. 12
      Compliancy            UEFI 2.5; PI: 1.4
      BIOS Version          D8000A10.
      Build Date            11/17/2020
      Access Level          Administrator
      
      Platform Firmware Information
      
      BXT SOC               F1
      MRC Version           0.56
      PUNIT FW              1A
      PMC FH                03.20
      TXE FW                3. 1. 70.2325
      ISH FW                4.1.0.3364
      GOP                   10.0.1036
      CPU Flavor            BXT Notebook/Desktop
      Board ID              Oxbow Hill CRB (06)
      Fab ID                FAB A
      
      Memory Information
      
      Total Memory          4096 MB
      Memory Speed          1600 MHZ

3. Go to Advanced > NCT55240D Super IO Configuration.
4. Change the Serial Port Mode for Serial Port 1 (ttyS0) and/or Serial Port 2 (ttyS1).
   • 1T/1R RS-422
   • 3T/5R RS-232 (Default)
   • 1T/1R RS-485 TX ENABLE Low Active
   • 1T/1R RS-422 with termination resistor
   • 1T/1R RS-485 with termination resistor TX ENABLE Low Active
   • Disable
5. Press F4 and select Yes to save your changes and reboot the SMART Controller with the new settings.