What device monitors the status of portals in an electronic access control system?

The door position switch is a critical component of an electronic access control system that monitors the status of portals, such as doors or gates. This device detects whether a door is open or closed and provides real-time feedback to the control system. By sending signals indicating the operational state of the door, it helps ensure that access control measures are functioning correctly. For example, if a door that is supposed to remain locked is detected as open, the system can trigger an alert, allowing for timely intervention.

This monitoring capability is essential for maintaining security and ensuring compliance with building protocols. Moreover, knowledge of door status can aid in automating other aspects of access control, such as logging access events and integrating with alarm systems or surveillance cameras.

Other options, while important in their own right, do not specifically fulfill the role of monitoring the state of portals. Credential readers focus on verifying users' access credentials; control panels serve as the central command for the access control system but do not monitor door status directly; alarm systems are intended to signal alerts but do not provide the real-time monitoring function that the door position switch offers.