Comelit MT COMELIT VSC IP START SERIES - Manual (Page 10)

2.1.5 Device video group polling
Add two or more then two channels video to compose a group (for more details for
operation steps please refer to Config module introduction). Click icon to
start group video polling. As figure below:
Click the icon once again to stop group video polling. Click icon to
close group video polling.
2.1.6 PTZ
2.1.6.1 PTZ control
Click PTZ, it control the camera lens 8 directions, respectively is Up,
Down, Left, Right, Up left, Down left, Up right, Down right, Zoom +/-,
Focus+/-, Apert +/-, PTZ speed, Light, Wipers, Fan. As figure below: