1. What is an access control system?
The access control system refers to the prohibition authority of the "door", which is the guard against the "door". Usually includes a controller, card reader, lock, door opening button, and management software. Access control systems are used in many office areas, warehouses, dangerous areas, prisons, and other areas where outsiders are not allowed to enter.
2. Identification process of access control system
The process of conventional access control system identification authority is divided into five steps:
a. Platform software editing authority;
b. The authority is issued to the access controller;
c. When swiping the card, the card number information is uploaded to the access controller;
d. The access control controller judges the authority of swiping the card. If it is legal, the door will be opened, and if it is illegal, the door will not be opened;
e. The card swiping event is uploaded to the management platform;
3. What is the difference between an IC card and an ID card?
a. ID card is a non-writable induction card. Commonly used in daily life are attendance cards, access control cards, etc.
b. IC cards support reading and writing functions, common ones are bus cards, employee cards, etc. (can be used for consumption).
4. How does the card reader read the card information?
At present, the common types of IC cards and ID cards are radio frequency cards, which use radio frequency technology. When the card is close to the card reading area, the card will automatically send information. After the card reader reads and decodes the information, it will send the card information to the control host to judge the authority.
5. What is the Wiegand Protocol?
The Wiegand protocol is an internationally unified communication protocol with many formats. In order to distinguish it from other manufacturers, the access control products distributed use the private Wiegand 27 and Wiegand 35 protocols;
a. Usually, only one card reader can be connected to one signal line;
b. The theoretical transmission distance is up to 110 meters, and the actual transmission distance is about 80 meters;
6. What is the RS485 protocol?
The RS485 protocol is also a common communication protocol, but it is not common among manufacturers;
a. Through a signal bus, multiple card readers can be connected in series in a hand-in-hand manner;
b. The transmission distance is relatively long. When the signal baud rate is 19200, the transmission distance can reach 600-800 meters;
7. What is "normally open normally closed"?
Normally open and normally closed refers to a switch state of the access control relay:
Normally open (NO) typically refers to that the relay is normally disconnected and closed after sensing the signal;
Normally closed (NC) type means that the relay is normally closed and disconnected after sensing a signal.
8. Common electric locks for access control
There are three types of electric locks commonly used in access control systems:
a. Magnetic lock: Pull in when power is on, unlock when power is off, it is a normally closed type, generally used for wooden doors, glass doors, and iron doors that open at 90°.
b. Electric mortise lock: lock when power is on, unlock when power is off, it is a normally closed type, generally used for wooden doors, glass doors, and iron doors that open 180°.
c. Cathode lock: lock when power is off, unlock when power is on, it belongs to the normally open type, and the use scene is smaller than that of an electric bolt lock, generally used for wooden doors and iron doors.
Author: Written by Anna Zhang from S4A INDUSTRIAL CO., LIMITED
Factory Address:Building S4A, South Third Lane, Qiuyuling Street, Zhangkeng Village, Hengli Town, Dongguan City, Guangdong Province Office Address:#601,floor 6 ,building 1,JINFANGHUA industrial zone, Bantian St. Longgang Dist. Shenzhen, PRC.
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