• TermDescription
  • Lmhosts File

    The Lmhosts file is a local text file that maps Internet Protocol (IP) addresses to NetBIOS names of remote servers with which you want to communicate over the TCP/IP protocol

  • LSS

    Lock Status Switch: A switch in the locking device that provides the system feedback whether or not the device is locked or unlocked.

  • National Electrical Code (NEC)

    A consensus standard published by the National Fire Protection Association (NFPA); commonly called "code".

  • NetBIOS

    NetBIOS is an acronym for Network Basic Input/Output System. It provides services related to the session layer of the OSI model allowing applications on separate computers to communicate over a local area network.

  • Noise

    The unwanted and/or unintelligible signals picked up on a cable circuit.

  • Normally Closed (NC)

    The condition or position of contact prior to initiation or energizing, in this case, a closed condition.

  • Normally open (NO)

    The condition or position of contact prior to initiation or energizing, in this case, an open condition.

  • Ohm

    The unit of measurement of resistance.

  • OPC

    A software interface standard that allows Windows programs to communicate with industrial hardware devices. OPC = OLE for Process Control

  • Operator

    A person who is able to operate within the Intelli-Site software. Examples of some of the items an operator may be able to do: configure devices, generate reports, view and acknowledge alarm conditions, manage card holders, assign access rights, and issue badges.

  • Output

    A device on a panel which sends a signal or provides information to the field devices to activate controls. Usually a relay which has dry contacts (not supplying power) only switching power provided to it.

  • Passive Infrared Detector (PIR)

    A motion sensing device, often used for intrusion detection systems, can also be used as a REX to unlock a door as someone wishing to egress approaches.

  • PLC

    Programmable Logic Controller: a small industrial computer that controls one or more hardware devices.

  • Proximity

    A common access card technology, proximity uses radio frequency to communicate between a card or tag and a reader without physical contact.

  • PSIM

    Physical Security Information Management

  • Rated voltage

    The maximum voltage at which electric component can operate for extended periods without undue degradation or safety hazard.

  • Reader

    A device that obtains data from an access credentials (card, tag, etc.) and send the data to a controller for an access decision. (Some units combine reader and keypad in one device.)

  • Relay

    An electrically controlled device that opens and closes electrical contacts to effect the operation of other devices in the same or another electrical circuit.

  • Resistor

    A circuit element whose chief purpose opposes the flow of current, causing a decrease in voltage.

  • REX

    A REX (request to exit) is used to determine if someone is waiting at the door. It can be ultrasonic, infra-red or simply a button. It is usually installed on the inside of the door and is used to automatically unlock the door if someone wants to leave a building. In most cases, a badge is not required to leave a building (although in some circumstances this may not be true). A REX sensor would then let the panel know that someone wants to leave, and react by the panel unlocking the door for them if programmed so.