Yes, that is the PTZ in your link.
According to Dahua, rs485 are not unified with IP digital cameras - only with analog.
A PTZ controller cannot control a digital IP camera. Digital or network PTZ controller are very expensive and only a few are available.
The rs485 connection on the ip camera is for NVR and software control - also for digital network PTZ controller.
At the moment, I got it to work with NVR and software but not with any analog equipment.