Why can’t the camera function be used?

If you want to move the viewing angle on the display screen, the operation is as follows: 1. The camera must be equipped with a PTZ or dome camera. You can select the PTZ control function in the control software and adjust the camera rotation and lens stretching. Change perspective. The PTZ needs to be set up before it can be used normally, and the power supply must be normal. The analog PTZ uses 485, and the signal cable must be connected properly. The digital PTZ is controlled through the network cable, as long as it is set up properly. 2. Ordinary fixed cameras cannot change the viewing angle through back-end control, and can only move the front-end camera. For example, a 2.5mm lens has a viewing angle of 100°, but the distance it can see is about 2-3 meters; a 60mm lens, its viewing angle is about 5°, but it can see approximately People and objects within 70 meters.