Security monitoring equipment preferred source maintenance! ? This safety monitoring device uses SONY high sensitivity image sensor, high-resolution images · Built-in high output infrared LED companies to install monitoring equipment, night vision distance up to 10-15 meters * Illumination: 0.3Lux / F2.0 (IR lights off ), 0Lux (infrared light to open) · illumination is lower than 1-3 Lux / F1.2, the image is automatically converted from color to black and white · light control design, automatic metering to control the infrared light switch · Automatic gain, auto white balance · backlight compensation function ? This low-power home security monitoring equipment to install monitoring equipment, stable performance, true 24-hour surveillance · infrared light using pulse-driven approach workshop to install monitoring equipment, which can effectively reduce the heat of infrared light and extend its life Frequently asked questions and deal with access control systems Symptom 1: access control device after a good connection with the software testing can not communicate with the computer. When using RS422 communication possible reasons: (1) the wiring between the controller and the network expansion is incorrect. (2) on the controller jumper is closed (communication for RS232); distance (3) controller to the network expansion over the effective length (1200M); Serial (4) computer is normal, with or without normal joins or is occupied by other programs install monitoring equipment, and then test to exclude these reasons; (5) the software settings, the device address number actually set, coupling does not correspond; (6) line interference, not the normal communication. Install monitoring equipment to install monitoring equipment _ _ Xinzheng source maintenance provided by Zhengzhou source maintenance Electronic Technology Co., Zhengzhou source maintenance Electronic Technology Co., Ltd. (www.hnxywb.com) strong, credible, in Zhengzhou integrated monitoring systems and other industries has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead source maintenance and you work into the brilliant, for a better future!