Appendix A: Glossary - Siemens FireSeeker FS-250 Programming Manual

F S - 2 5 0 P R O G R A M M I N G M A N U A L

APPENDIX A: GLOSSARY

Alarm Signal. A signal indicating an emergency requiring immediate action, such as
an alarm for fire from a manual station, a waterflow alarm, an automatic smoke
detector, etc.
Alarm Silence Inhibit. An option that prevents a human operator from silencing the
notification appliances for a preset period of time.
Alarm System. A combination of compatible initiating devices, control units, and
notification appliances designed and installed to produce an alarm signal in the
event of a fire or other condition as designed.
Alarm Verification. A preset option that causes the control unit to verify alarms
originated by smoke detectors before indicating an alarm.
Annunciator. A remotely located, electrically powered display, separate from the
control unit, containing LCD's, LEDs or lamps to indicate the states of the fire alarm
system.
Audible Signal. A sound made by one or more audible notification appliances, such
as bells or horns, in response to the operation of an initiating device.
Authority Having Jurisdiction (AHJ). The organization, office, or individual
responsible for approving equipment, installation or procedures.
Auxiliary Relays. Control relays that energize only during alarm conditions that are
used to either apply power to or remove power from other equipment during an
alarm condition.
City Tie. Provides connections for shunt, local energy, central station or remote
station.
Class A Circuit. An initiating device or notification appliance circuit within which all
components remain fully functional, even though a single open or ground exists in
the circuit.
Class B Circuit. An initiating device or notification appliance circuit within which
some or all components may be disabled with a single open or ground exists in the
circuit.
DACT. Digital Alarm Communicator Transmitter (see NFPA 72)
Detector - Smoke, Photoelectric Type. A detector employing the photoelectric
principle of reflection or obstruction of light by smoke.
EOLR. End-of-line resistor, used for termination purposes.
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