The entrance guard system classification

The entrance guard system classification
Access control system according to the import and identification methods can be divided into the following three categories:
1, the password identification: by examining the input password is correct to identify import permission.
This kind of product is divided into two categories: one category is the common type, one kind is disordered keyboard type (the number on the keyboard is not fixed, not regular automatic change).
Common type: advantages: convenient operation, low cost without carrying the card. Disadvantages: it can only accommodate three password, easy to leak, the safety
Difference; no import record only one-way control.
Disordered keyboard type (the number on the keyboard is not fixed, not regular automatic change): advantages: convenient operation, without carrying the card, safety coefficient is slightly higher
Disadvantages: easy to leak; password, or not high security; no import record only one-way control, high cost.
2, card identification: the card reader or read pin to identify import permission,
According to the card type is divided into:
Card: advantages: low cost; one card (+ password), security in general, can be combined with computer, open record; disadvantages: cards, equipment
Wear, short life; cards are easy to copy; not easy two-way control. Card information easily because of the external magnetic field is lost, so that the card is invalid.
RF card: card, equipment advantages: no contact, convenient opening safety; long service life, the theoretical data for at least ten years; and high safety, can be linked microcomputer,
There are open records; can realize bidirectional control. The cards are difficult to duplicate; disadvantages: high cost.
3, face recognition: the biological characteristics of inspection personnel to identify import. A fingerprint, iris, face recognition. Advantages: from knowledge
Don't view an excellent safety without carrying the card.
Shortcomings: high cost. The recognition rate is not high, high requirements on the environment, the user requirements (such as fingerprint can't scratch, the eyes are not inflamed bleeding,
Face can not be injured, how many or beard), is not convenient to use (such as iris type and facial recognition, a mounting height, but the use of
The height of each are not identical)
Worth noting is generally believed that biometric access control systems are safe, in fact this is a misunderstanding, entrance guard system safety is not only a recognition method
Security, including control system security, the security of software systems, communication systems, power system security of the whole system is a
Overall, which is not good, the whole system is not safe. For example some fingerprint access control system, the controller and the fingerprint identification device is integrated, installation
To be installed outdoors, so that the control lock switch line is exposed in the outdoor, can easily be opened.
Access control system according to the design principle can be divided into the following two categories:
The 1 controller with card reader (Shi Bieyi): the shortcomings of this design is the controller must be installed in the door, so part of the control line must be exposed at the door
The outer, insiders without card or password can easily open the door.
The 2 controller and card reader (recognition) split: this kind of system controller is arranged indoors, only the card reader input line dew in outside, other
All control lines are in the interior, and the reader is transmitted digital signal, therefore, if there is no effective card or password to anyone not door.
This kind of system is the user's preferred.
Access control system with microcomputer communication mode can be divided into the following two categories:
1 single control type: this kind of product is the most common, applicable to small systems or installation position centralized unit. RS485 commonly used means of communication.
It has the advantages of less investment, dedicated communications lines. Disadvantage is that once installed can not be easily replaced management center position, is not easy to realize network control
And remote control.
2 network: these products are of high technological content, at present still do not see more, only a few company's products molding. By its means of communication
TCP/IP protocol is used by network. The advantage of this type of system is the control and management center through the LAN data transmission, management center location
In order to change at any time, without re wiring, easy to implement control or remote control network.
Suitable for installation of the system or geographically dispersed units. The shortcomings of such systems is part of the communication system stability depends on local area network
Stable.
Access control system
The 1 part: the core access controller access control system, equivalent to the computer's CPU, processing and storing it for input, output information of the system
Storage, control etc..
2 card reader (Shi Bieyi): read the card data (biometric information) equipment.
3 electric control lock: executive component to lock the door access control system. The user should according to the gate material, go out the request and so on demand different lock. Mainly include
The following types:
1 electromagnetic lock: electromagnetic lock after the power is open  comply with fire safety requirements. And equipped with a variety of mounting rack for customers to use. The lock is suitable for single
To the door, glass door, fire door, electric door open.
Yang Jisuo: 2 anode lock is off to open the door, meets the fire requirements. It is installed in the upper part of the door frame. And the electromagnetic lock is different for anode lock
In the two-way door, glass door, fire door, and it has the gate magnetism detector, can detect the safety state of the door at any time.
3 cathode lock: General cathode lock for electric door type. Application of one-way doors. Install the cathode lock must be equipped with UPS power supply. Because of the blackout in Yin
The lock is a lock