The device channel number of the camera should be changed. What is the unknown error?

There is no video signal in the network camera channel. The error that the channel number of the display device is unknown is mostly caused by network problems. Common causes and solutions are as follows:

First, check whether there is a problem with the power supply of the surveillance camera. If it is an infrared surveillance camera, you can see a red light at night, indicating that the power supply is normal; If not, you can use a multimeter to measure the power supply and power supply line.

Second, check whether there is a problem with the line. If there is nothing wrong with the wiring, the camera may be broken. You can use the replacement method to test it and change it to a good camera. If there is an image, the camera is broken.

Third, see if there is a problem with the video terminal, because the video equipment is set incorrectly or improperly matched, and there will be a black screen phenomenon.

Fourth, the monitored video signal line is broken (including line damage and poor connector contact), which will also cause a black screen.

Fifth, monitor camera control equipment, such as DVR/NVR/ acquisition card. , and check whether its related software runs normally and is the latest version. If not, it is recommended to contact the manufacturer for software upgrade.