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What is An Access Control System?

May 19 , 2023

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



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  S4A-Security For All.S4A Industrial Co., Limited, Founded in 2010, We have been dedicating in access control production R&D and sales for 10year till now. With the belief that we do one thing well in a lifetime, our CEO has been in this industry for 15 years. During the past 10 years, our products have been exported to various countries and regions. And 90% of customers come from the recommendations of cooperative customers, and 80% of the turnover comes from cooperative customers in the past 10years.Your business is a plant, we are the gardener, our mission is to water and fertilize the plant, and make it become the towering tree. We attach great importance to the partner's appeal, customer's suggestions, and feedbacks. To strengthen Product quality awareness, client's service awareness. Our clients and S4A are on the same path walking for many years.       S4A's future would be even more brilliant, this is related to all of our staff's working sweat. When you join this team, you will feel an invisible power to drive walk forward. S4A mainly produces a series of security Door Access Control such as:Network Access Controller, Locker board, Electromagnetic lock, Standalone door Controller, Automatic door opener, etcOur team can manufacture products, sell products, and do after-sales.In the realm of access control, one company stands out for its unwavering commitment to providing security services for everyone. S4A, which stands for "Security for All," has been at the forefront of access control technology for the past 13 years. With its own state-of-the-art factory and a strong focus on research and development, S4A has continuously delivered cutting-edge access control machines with the latest functions. Their dedication to product quality, customer feedback, practicability, and cost performance sets them apart as a leader in the industry.Factory and R&D Expertise:S4A takes pride in its fully-equipped factory, where skilled engineers and technicians work tirelessly to develop and manufacture access control solutions that meet the highest standards. The company's investment in research and development has resulted in a steady stream of innovative products that cater to evolving security needs.By staying ahead of the curve, S4A ensures that their customers have access to the latest advancements in access control technology.Quality Assurance and Customer Feedback:At S4A, product quality is of paramount importance. The company adheres to rigorous quality control procedures throughout the manufacturing process to guarantee the reliability and durability of their access control machines. Each product undergoes comprehensive testing to ensure it meets industry standards and exceeds customer expectations. S4A also places great value on customer feedback, actively seeking input to continuously improve their products and services. By listening to their customers, S4A maintains a customer-centric approach and delivers solutions that address real-world security challenges.Practicability and Cost Performance:S4A understands that access control solutions must not only be technologically advanced but also practical and cost-effective. The company's emphasis on practicability means that their products are designed to be user-friendly, easily integrated into existing systems, and adaptable to various environments. S4A's access control machines are known for their intuitive interfaces, simple installation processes, and seamless compatibility with other security systems. Additionally, S4A strives to provide cost-effective solutions without compromising on quality. Their competitive pricing ensures that security is accessible to businesses and individuals of all sizes.With 13 years of industry experience, S4A has cemented its position as a leading provider of access control solutions. Through their dedication to "Security for All," the company has set a benchmark for excellence in product quality, customer satisfaction,practicability, and cost performance. S4A's in-house factory and research and development capabilities enable them to stay at the forefront of technological advancements in the field of access control. As the company continues to evolve and innovate, S4A remains committed to empowering individuals and organizations with the highest level of security, ensuring that everyone can enjoy the peace of mind that comes with a reliable and efficient access control system.We can create value for you!Quality takes great importance for a company's credibility, and buyer's every penny spend must worth it. That is our most basic principle. Our business mainly for wholesale, so we could offer large quantities at competitive prices. During the past 10 years, We work hard to create value for our customers, and with our help, customers have an increasing market share. 99% of the customer...<
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