Here is where to start: Byte Paradigm documentation page.

On this page, you'll notably find the data sheets of the devices and the software user's guide.

While the data sheet describe the rough capabilities of the hardware devices and the technical characteristics such as absolute maximum ratings, the user's guide provide an extensive description of the devices functional capabilities.

Please go to 8PI Control Panel user's guide and browse to the mode of operation that you are interested in for you GP or Xpress series device.