What is the primary function of a "door controller" in access control systems?

The primary function of a door controller in access control systems is to manage access decisions based on input. This includes receiving data from various input devices such as card readers, biometric scanners, or keypads, and making real-time decisions about whether to grant or deny access based on pre-defined criteria. The door controller processes this information and interfaces with the locking mechanism to either unlock or keep the door secured, depending on the user's credentials.

In this role, it is the decision-making component that enhances the security of the premises and ensures that only authorized individuals can pass through the controlled entry points. This function is crucial for maintaining the integrity of security systems by allowing for customizable access permissions and integration with broader security protocols.

Other options, while related to security, do not capture the essential role of the door controller. For instance, locking and unlocking doors physically is a function of the locking hardware controlled by the door controller, rather than the controller itself. Providing emergency exits is a function of overall building design and safety regulations, not specifically the door controller. Monitoring employee attendance typically falls under workforce management systems rather than access control.