Access Control systems are becoming increasingly prominent not only in the management of entrances and exits but also in the monitoring and screening of personnel within defined areas. Such systems extend to the collection of data, the movement patterns of users and the integration with other security functions and building management services.
The most basic form of an access control system is a very simple system intended to protect a single door, where a visitor can be interrogated by means of a simple intercom.
At the other end of the scale is a computer-based multi-door high security system with remote surveillance and multiple users, with extra facilities for visitors.
The former would be classed as a simple door entry system. The latter system will involve the use of many readers, by which personnel are checked as to their right to enter into a prescribed area, with all transactions logged on a database.