Start the POS Printer Utility from the Windows Start Menu (The POS Printer Utility screen appears).
Select the 'Use the installed printer port settings' option.
Select the USB S/N Setup option from the menu (The USB S/N Setup screen appears).
Enter the printer's serial number in the New Serial Number text box.
Select Set (A Warning screen appears).
Select OK (The USB S/N Setup message appears).
Select OK (The serial number is sent to the printer and the USB S/N Setup screen reappears).
Select the Memory Switch Setup option from the menu (The Memory Switch Setup screen appears).
Select the Receive Button (The POS Printer Utility will retrieve the printer's current configuration and reload).
Update Switch No. MSW5-3 (USB Mode) to Virtual COM.
Select the Set Button (The POS Printer Utility will send the new configuration to the printer and reload).
Select the Printer Select option from the menu (The Printer Select screen appears).
Select the 'Use the following printer settings' option
Select the Model name of CT-S310II
Select the Interface type of Serial/VCOM
Select the Detail Button (The Detail Setup screen appears).
Select the Port identified in the Configuring the Virtual Serial Port Number process.
Select OK (The Detail Setup screen closes).
Select the Information button
Close the Printer Information screen.