Glossary Terms - R


The portion of a door frame into which the door fits. Also, the abutting edges of a pair of doors, so shaped as to provide an overlap. One half of the edge projects beyond the other half, usually ½”.


Usually refers to the horizontal members in a wood door, located at the top and bottom edges. Combined with the stiles they form a perimeter frame for the door core.


Either wall mounted or integrated into a lock, a reader reads the data from a card or credential and transmits that data to the controller.


Device that converts AC power to DC. Eliminates the “Buzz” normally associated with AC Operation.

Regular Arm

A pullside mounted system where the arm is at a right angle to the door when in the closed position.


A power supply that provides a constant output regardless of input voltage variations.

Removable Core Cylinder

A cylinder core that can be removed from alock by use of a CONTROL KEY and installed in another lock of the same manufacturer and type.

Removable Mullion

A mullion separating door openings within a frame opening. It can be removed temporarily to allow for movement of items through the opening that would not pass through a single door leaf side.

Request to Exit (REX)

A signal that notifies the system to release the door so that someone can exit, as well as to bypass the DPS so that it does not register a forced open alarm for a valid exit.

Residual Magnetism

The quantity or amount of magnetic holding force that an electro magnet retains after the power has been removed.


The opposition to the flow of an electrical current measured in OHMS.


Of or pertaining to a keyway and corresponding key blank whose sale and/or distribution is limited by the lock manufacturer in order to reduce unauthorized key proliferation.


(of a door) – The distance measured on the hinge or pivot side of the opening, from the face of a door to the face of the frame, when the door is in a closed position.


Pertains to a product that may be changed in the field to accommodate any hand of the door.


A hardware lock or latch trim plate attached to the door face under the lever, knob or turnpiece.

Rotating Constant Method

A method used to progress key bittings in a master key system, wherin at least one cut in each key is identical to the corresponding cut in the top master key. The identical cut(s) is moved to different locations in a logical sequence until each possible planned position has been used.