DS will not discover the Professional series cameras as a PTZ model, they have to be manually set up as PTZ in order to use the focus commands. This may need to be set up in third party systems also.
Pelco Cameras, Pelco Video Management
DS video recorders
Professional series Sarix cameras
The DS video management does not see the Professional series cameras as a PTZ, instead it sees them as a dome camera. Thus the focus function does not come up for display.
Manually set the camera to a PTZ and the focus features can be used