This window helps you configure your pole display. By default, it has been set as COM1. The further specifications are also included. If you want to change your device and the related specifications, you can do so by replacing the values given.
Below the Pole Display Type panel is a box where you are supposed to enter your Open cash Drawer Command. it is supposed to be different for different hardware systems. For your reference, a link is given, from where you would be able to find the drawer command for your hardware.