门禁系统中的常识（Common sense in access control system）.doc

门禁系统中的常识（Common sense in access control system） Common sense in access control systems Post, By:2004-9-17, 16:38:00 [see the author] 1 、 What are the products in the access control system? Access control system contains two parts: (1) the identification of the body: a particular symbol of a persons own possession is used as an identification mark, such as a palm print, a fingerprint, and a face... Etc... (2) mark identification: the special marks of external objects are used as identification signs, such as passwords, induction cards, IC cards, etc... 2, what does the access control system contain? It can be divided into 3 parts (1): responsible for receiving the signal, the control host and to identify the signal, open or close an action (2) door lock: lock the door body, unless the power or electricity delivery, otherwise the normal operation should not automatically open the door (3) other accessories: outgoing switch, power supply, etc. 3, access control system is dangerous factors (such as wire, high temperature products are weak? To avoid some unpredictable fire, etc., access control systems are mostly 12V or 24V products. 4 electric locks are controlled by electric energy Must be made by the power control of the lock, it can be considered as the electronic control lock, electric lock and power can be divided into open the door (Fail -Safe) and closed off (Fail-Secure) two, such as magnetic locks, electric plug locks are power door lock. 5, what is the power off (power transmission door) (Fail-Secure)? Normal door lock body case, not electricity, and showed the lock state, through the external control system (for example: credit card machine, card reader) the lock is energized, the internal body will play action, and complete the open state, such as the cathode lock. 6. What is power off the door (Fail -Safe)? The normal closed case, the lock body continuous electricity, and showed the lock state, through the external control system (for example: credit card m