Access Control Systems Flashcards

Which access control credential technology uses radio frequency to read a card or fob without physical contact?

Answer: RFID (Radio Frequency Identification)

RFID technology reads credential data wirelessly using radio frequency signals between the card/fob and the reader.

In access control terminology, what does 'fail-safe' mean?

Answer: The lock unlocks (opens) when power is lost

A fail-safe lock is electrically unlocked, meaning it opens (fails to the safe/egress position) when power is removed.

What does 'fail-secure' mean in an electrified locking device?

Answer: The lock remains locked (secured) when power is lost

A fail-secure lock is electrically locked, meaning it stays locked when power is removed, prioritizing security over free egress.

Which component in an access control system reads the credential and sends data to the controller?

Answer: Reader

The reader (card reader, keypad, or biometric device) captures credential data and transmits it to the access control panel for verification.

What is a Request-to-Exit (REX) device used for in access control?

Answer: To signal the controller that someone is legally exiting so the door alarm is suppressed

A REX device (motion sensor or push button) detects egress and suppresses the door alarm to prevent false alarms when authorized users exit.

The Wiegand protocol is used in access control primarily for what purpose?

Answer: Transmitting credential data from a reader to an access control panel

Wiegand is a legacy communication protocol used to send card data (typically 26-bit format) from a reader to an access control panel.