R
Rack Mount
Equipment designed for mounting within a standard enclosure. This usually refers to servers and other IT equipment.
Radio Frequency (RF)
The frequency of certain electromagnetic waves. This term usually is applied to wireless systems that use radio frequencies to transmit signals from detectors and transmitters to a receiver or panel.
Radio Frequency Interference (RFI)
Radio frequencies imposed accidentally or deliberately on a radio frequency signal that degrade or destroy the ability to transmit or receive proper signal information.
Rate-Of-Rise Heat Detector
A device that responds when the temperature rises at a rate exceeding a predetermined value.
Ready Output
A specified output that is turned on when all disarmed burglary zone types are in a normal condition. The output is turned off when any disarmed burglary zone is placed into a faulted condition.
Real Time
Current time. An event that is processed in real time is processed as it happens rather than later on.
Receiver
A communication device that relays data from a panel to software installed on a computer. See Central Station Receiver.
Receiver 2
A programming option that allows the user to send reports to a second receiver.
Receiver Key
An eight-digit code that is programmed into Remote Link and embedded into the receiver. The panel requests this key the first time it is contacted by the receiver. The panel retains the receiver key in its memory and accepts commands only from a receiver with a matching key.
Region
A defined portion of a camera’s field of view (FOV), such as a driveway or floor of a lobby, that determines where a camera reacts to motion, people, vehicles, or animals. Regions are drawn by a security technician in Dealer Admin or an end user in Virtual Keypad. Alarm panel zones can be associated with a region to trigger the alarm or trigger an output.
Regulated Power Supply
A power supply’s output that is automatically held to a constant level or within a narrow range, regardless of loading variation
A voltage source where the output voltage remains constant.
Relay
An electrically activated device that provides an opening or closing across two points for the purpose of switching the control voltage of lights, annunciators, bells or other devices.
Relay, Supervisory
A relay with its coil in series with the devices and the wiring it supervises. Interruption of the supervisory current causes the relay contact to close, actuating trouble signals.
Remote Alarm
A visual or audible signaling device used to signal violations at locations removed from the central control station or monitored openings. For example, a remote alarm may be placed on a roof, in a stair tower, or at a guard station outside a building.
Remote Annunciator
The term the fire industry uses to refer to keypads. See Keypad.
Remote Key
A one to eight-digit code entered into the panel program that is used to verify the authority of the person or company, receiver, or computer contacting it.
Remote Phone Number
A phone number the panel dials after a remote programming attempt is made. Once the initial attempt is made, the panel hangs up the phone line and dials the remote phone number.
Repeater
A network device that repeats the signals on a network. Repeaters operate as the physical layer of the OSI Reference Model. Repeaters amplify weak signals from one segment and repeat them on another segment.
Report
A signal or message sent by the panel to the monitoring center receiver in response to activity within an area, a programmed occurrence (such as a timer test), or a change in the system status.
Request to Exit (REX)
Any device that takes the place of a reader or keyboard to allow users to egress from an access-controlled area. The REX device overrides the door lock and does not discriminate among users.
Reset
A report sent to the monitoring center receiver in response to a bypassed zone resetting.
Drop power to sensors, such as smoke detectors, in order to restore them to normal mode.
Reset Jumper
The two reset pins on a DMP Command Processor panel used to reset the panel prior to programming.
Reset Panel
A keypad display that instructs the technician to reset the panel using its on-board reset jumper before programming access is granted.
Reset Swinger Bypass
A programming option allowing a zone that has been swinger bypassed to reset back into the system if it has been in a normal condition for one complete hour after being bypassed.
Resistance
The opposition to current flow, measured in Ohms and shown by the symbol R.
Restoral
A report sent to the monitoring center receiver in response to the restoring to normal of an alarmed or troubled zone.
Restoral Report Options
A programming option allowing the user to select whether a restoral report is sent and when. The following options can be selected:
No: Disables the restoral report option for the specified zone. The zone continues to operate but does not send a restoral report to the monitoring center receiver.
Yes: Enables a zone restoral to be sent to the receiver when the zone restores to normal from a faulted condition.
Disarm: Zone restorals generated during the area armed period are held in the panel memory until the area is disarmed. At that time, the zone restoral report is sent to the receiver.
Retard Delay
A programmable zone characteristic that provides for a delayed period before a short on the zone is accepted as an alarm. This feature is often used when the zone is connected to a waterflow switch to allow for fluctuations in water pressure.
Ribbon Cable
A flat electrical cable containing several individually insulated conductors. Ribbon cable may have each conductor identified by a different color, or it may have a common color for all. The DMP SCS-1/SCS-1R Receiver uses ribbon cable to connect the SCS-1062 card with the other components.
Ring Topology
A network organization where the nodes are connected in a ring. Data passes around the ring from node to node. Each node retransmits the data to the next node in the ring.
Riser
Wet or dry sprinkler pipe. Wet pipe is filled with water at all times. Dry pipe contains air under pressure which escapes when a sprinkler head is fused, allowing water to flow to the fused head.
RJ11 Jack
A four-conductor phone connector used to connect standard telephones to a phone network.
RJ31X/RJ38X Jack
An eight-conductor phone jack used to connect commercial burglar/fire alarm systems to a phone network. The only difference between the two jack types is a jumper installed across terminals 2 and 7 on the RJ38X to allow phone cord supervision. Two phone lines are required for commercial fire systems.
RJ45
An eight-conductor jack used for network connection.
Read Only Memory (ROM)
Computer memory where data is pre-recorded. Once data is written onto a ROM chip, it cannot be removed and can only be read. ROM retains its contents even when the computer is turned off. Most personal computers contain a small amount of ROM to store critical programs, such as the program that boots the computer.
Rotary Switches
Two small electronic components with movable dials installed on DMP zone and output expanders. Using a small slotted screwdriver, the user can set the device electrical address by turning the dials to an appropriate number on the dial.
Router
A network device that connects networks by maintaining logical protocol information for each network.
Routing Table
A table maintained by a router that specifies the path and distance (in hops) between itself and the networks. Routers use these tables to determine whether a datagram should be forwarded.
RS-232
A standard defining interface voltage and current levels and other signal characteristics used to couple digital equipment to a transmission link. This is the standard DMP uses for direct connecting to a computer, local printer, or Uplink Any NET-DMP Network Access Module.
Runner
A monitoring center employee or someone under contract to the monitoring center, dispatched to the premises where an alarm has been received. His or her primary duty is to assist the police with their investigation.