Qi accessories, accessories mainly to configure the installation of additional monitoring system equipment in a variety of discrete components and modules can be more prepared some, mainly for maintenance of equipment. There are a variety of commonly used parts integrated circuit chips and various circuits required by the circuit of discrete components. Other larger device must be configured a certain function modules for emergencies. Thus, after repairs can produce good results with a small investment, saving a lot of funds to update equipment. Frequently asked questions and deal with access control systems Symptom 5: The effective card near the reader, the buzzer sounds for companies to install monitoring systems, LED light turns green, but the door did not open. Possible causes: (1) the connection between the controller and electric control lock is incorrect; (2) to the power locks power supply is normal (power locks require a separate power supply); (3) electric lock failure; (4 ) bolt and locking occurs mechanically stuck; Symptom 6: A valid card near the reader, the buzzer sounds for companies to install monitoring systems, door open, but the reader light off. Possible causes: (1) controller and electric locks share a power supply, reverse power locks work when potential interference, causing the controller to reset; (2) Power is not enough, resulting in the controller, the reader does not work. Install monitoring systems offer, the installation of monitoring systems, 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!