Readers and controllers are one of the main components associated with access control systems. The visitor must present an identifier, after which the encoded information is recognized by the main device. The information is transferred to the controller, which compares it with what is already stored in the database. Based on the results of such an analysis, a decision is made to open access or block it.

Brief classification
One of the main characteristics of classification is how the identifier affects the sensing element. Depending on this, several types are subdivided.

Contact electronic devices. one). Touch Memory key readers are the most common. 2). Magnetic and chip card scanners are most often used in the banking sector. 3). Sometimes devices are supplemented with a keyboard for manual input or additional programming.

Contactless. They are becoming more and more popular due to the development of modern technologies. Thanks to their use, identification passes at a certain distance. In this case, the identifier itself is not affected. RFID is a designation for one of the most common contactless data transmission technologies.