Card receivers;

The system includes devices such as:

readers;

Card receivers;

adapters;

Controllers.

Software, which is designed specifically, connects all these devices among themselves. The reliability of the access system will be determined by the type of identifier that is used. Non -contact cards are the most common. They can easily fake in workshops for the production of keys on equipment, which can be freely bought. So for objects that need high protection, such identifiers will not work. Traditionally, access control system can be used in various fields. For example, in local payment systems, loyalty systems and so on. The controller is the «brain» of the system. It is he who determines whether it is worth passing a person through the door or not. It saves identifiers codes with a list of access right for each of them. After a person presents the identifier, a matter of a matter of him will be compared with the one that is stored in the database. It is on the basis of this code that a decision will be made whether to open the door or not. The controller for work needs power supply. Therefore, all controllers, as a rule, are equipped with a battery. He can support the operation of the controller for several hours. This is necessary in case the network is accidentally disabled for some reason.