Back

Request to Exit (REX) Device

TL;DR: A Request to Exit (REX) device allows users to unlock a secured door from the inside, typically using a motion sensor, push button, or touchless sensor.

What is a Request to Exit (REX) Device?

A REX device is a component of an access control system that enables authorized users to exit a secured area without requiring credentials. It is commonly installed on doors with electromagnetic locks (mag locks) or electric strikes to ensure smooth and controlled egress.

REX devices are widely used in offices, data centers, and high-security facilities, often integrating with fire safety and alarm systems.

How Does a REX Device Work?

  1. User Approaches the Door – The exit request is triggered by motion detection or manual activation.
  2. REX Sends a Signal – The device communicates with the access control system to release the door lock.
  3. Door Unlocks Temporarily – The system disengages the lock, allowing the user to exit.
  4. Automatic Relocking – Once the door closes, the access system re-engages the lock.

For example, in a secure office, a motion-activated REX automatically unlocks the door when an employee approaches from inside.

Types of REX Devices

  1. Motion Sensor REX – Detects movement near the door and unlocks automatically.
  2. Push Button REX – Requires users to press a button to request exit.
  3. Touchless REX – Uses infrared or capacitive sensing for hygienic, hands-free exit.
  4. Mechanical REX (Crash Bar) – A physical bar that, when pushed, releases the lock.

How to Implement a REX Device

  1. Choose the Right REX Type – Select based on security needs and user convenience.
  2. Integrate with Access Control – Connect the REX to electromagnetic locks, electric strikes, or door controllers.
  3. Ensure Compliance with Fire Codes – Verify that exits remain operable in emergencies.
  4. Test & Maintain – Regularly check functionality to ensure smooth operation.

Conclusion

A REX device enhances security and convenience by providing a controlled, authorized exit from secured areas. It is a crucial part of access control systems, ensuring compliance with safety regulations while maintaining security.