Symptom 2: Put the card near the reader to install monitoring systems company, the buzzer does not sound, lights and no response has installed monitoring system, communication is normal. Possible causes: (1) the connection between the reader and the controller is not correct; (2) the reader to the controller circuit exceeds the effective length (120M); security monitoring system: application of optical fiber, coaxial cable or Microwave transmission of video signals within the cell in its closed-loop control system is installed, and constitutes a complete system independent from the camera to the image display and recording. It can real-time image, a true reflection of the object being monitored, it can instead of doing for a long time monitoring in harsh environments, through a VCR recorded. At the same time the alarm system equipment for intrusion alarm. School to install monitoring systems | Source Maintenance (certified) | Jiaozuo install monitoring systems 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.