When used for authentication with a PS4, the DS4 is simply plugged into the USB A port and left off. Turn on the PS4 console from the front panel. The DS4 will appear to be off but it is supplying the Quadstick with a stream of data for authentication.
The DS4 MUST be prepared with the proper settings prior to use. A common complaint is the PS4 stops responding after ten minutes. This is usually because the default time period for the DS4 to turn off is ten minutes and this needs to be disabled. See Preparing the Dual Shock 4 Controller for more information.
As of firmware build 2276 (March 16, 2020), the DS4 control data can also be used within the Quadstick's configuration spreadsheets. Both joysticks and all the buttons can be used as if they were two UltraStik 360s. The touchpad and motion sensors are not read. USB Host DS4 tester is an example configuration spreadsheet showing which "usb_..." inputs map to the controls on the DS4.
