CRL Security Systems & Electronic Access 2

Question 1

Which electric locking device is described as 'fail-safe' because it unlocks when power is lost?

Accepted Answer

Magnetic lock

Answer

A magnetic lock needs continuous power to hold, so it releases when power is removed.

Question 2

What is the primary purpose of a request-to-exit (REX) device on an access-controlled door?

Accepted Answer

To let a person leave without triggering a forced-door alarm

Answer

A REX shunts the door-position alarm and releases the lock when someone exits legitimately.

Question 3

A door position switch (DPS) on an access-controlled door primarily reports what?

Accepted Answer

Whether the door is open or closed

Answer

A DPS is a contact that monitors the open/closed state of the door.

Question 4

Which wiring protocol is commonly used between card readers and access control panels and sends data on D0 and D1 lines?

Accepted Answer

Wiegand

Answer

Wiegand uses two data lines (D0 and D1) to send credential bits to the panel.

Question 5

What is a 'held open' alarm in an access control system?

Accepted Answer

The door remains open longer than the programmed time

Answer

A door held open alarm triggers when the door stays open beyond its allowed time.

CRL - Certified Registered Locksmith Practice Test