4POS uses standard Windows settings & drivers!
Has your printer been configured into Windows?
If not Please install the printer under Start-Settings-Printers & Faxes-Add a printer
If you are using 4POS TOUCH - Press option menu (Top Left) then press control-c.
Option3 - Select your printer from the list.
If you are using 4POS SCAN - press control-c.
Option3 - Select your printer from the list.