DVR can not control PTZ possible reasons: 1. The cost to install monitoring systems to do with BNC output, N and PAL format selection is not correct, the image becomes black and white 2. DVR and monitor impedance mismatch 3. Video transmission distance video transmission line is too far or too much attenuation 4. DVR color, brightness and other settings are not correct a few minutes after starting the DVR will automatically reboot or frequent crashes DVR can not control PTZ possible reasons: 1. The input voltage is unstable or too low 2 Hard disk jumper 3. Incorrect disk has bad sectors or bad hard line 4. bad enough power switching power supply front-end video signal instability 5. 6. heat, too much dust, the machine is too harsh operating environment to understand digital radio system factory installed monitors system, we must be familiar with the concept of LAN installation of monitoring systems, it is very important. Because here is essentially based on the concept of ip network for data transfer. Also install monitoring systems manufacturers, wireless devices here just as the role of the media of information transmission. As long as the staff is engaged in ip network monitoring can quickly get started. Digital wireless transmission equipment mainly 2.4GHZ and 5GHz bands, can be encrypted with a strong anti-interference, high and wide load data, etc., can be used in digital multimedia wireless video surveillance, wireless networks transmit signals, wireless video surveillance, Based on the control signals and the like are widely used in various fields ip. Install monitoring systems company, the source maintenance (certified), the installation of monitoring system is provided by Zhengzhou source maintenance Electronic Technology Co., Zhengzhou source maintenance Electronic Technology Co., Ltd. (www.hnxywb.com) is a leader in Zhengzhou, integrated monitoring system, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. In leading source maintenance staff warmly welcome all inquiries negotiations to create a better source of future maintenance.