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A security alarm[1] is a system designed to detect intrusion – unauthorized entry – into a building or area. Security alarms are used in residential, commercial, industrial, and military properties for protection against burglary (theft) or property damage, as well as personal protection against intruders. Car alarms likewise protect vehicles and their contents. Prisonsalso use security systems for control of inmates.
Some alarm systems serve a single purpose of burglary protection; combination systems provide both fire and intrusion protection. Intrusion alarm systems may also be combined with closed-circuit television surveillance systems to automatically record the activities of intruders, and may interface to access control systems for electrically locked doors. Systems range from small, self-contained noisemakers, to complicated, multi-area systems with computer monitoring and control.
The most basic alarm consists of one or more sensors to detect intruders, and an alerting device to indicate the intrusion. However, a typical premises security alarm employs the following components:
- Premises control unit (PCU), Alarm Control Panel (ACP), or simply panel: The “brain” of the system, it reads sensor inputs, tracks arm/disarm status, and signals intrusions. In modern systems, this is typically one or more computer circuit boards inside a metal enclosure, along with a power supply.
- Sensors: Devices which detect intrusions. Sensors may be placed at the perimeter of the protected area, within it, or both. Sensors can detect intruders by a variety of methods, such as monitoring doors and windows for opening, or by monitoring unoccupied interiors for motions, sound, vibration, or other disturbances.
- Alerting devices: These indicate an alarm condition. Most commonly, these are bells, sirens, and/or flashing lights. Alerting devices serve the dual purposes of warning occupants of intrusion, and potentially scaring off burglars. These devices may also be used to warn occupants of a fire or smoke condition.
- Keypads: Small devices, typically wall-mounted, which function as the human-machine interface to the system. In addition to buttons, keypads typically feature indicator lights, a small multi-character display, or both.
- Interconnections between components. This may consist of direct wiring to the control unit, or wireless links with local power supplies.
- Security devices: Devices to detect thieves such as spotlights, cameras & lasers.
In addition to the system itself, security alarms are often coupled with a monitoring service. In the event of an alarm, the premises control unit contacts a central monitoring station. Operators at the station see the signal and take appropriate action, such as contacting property owners, notifying police, or dispatching private security forces. Such signals may be transmitted via dedicated alarm circuits, telephone lines, or Internet.
Cocoa
Cocoa is a city in Brevard County, Florida. The population was 17,140 at the 2010 United States Census.[1] It is part of thePalm Bay–Melbourne–Titusville Metropolitan Statistical Area.
Several stories circulate among Cocoa old timers as to how the town got its name. One story says that the mail used to come by river boat and was placed in an empty tin box labeled Baker’s Cocoa. The box was nailed to a piling in the river next to downtown. Additionally, an early hotel in the area, located on the Indian River lagoon, was named Cocoa House.[4]
In 1885, the S. F. Travis Hardware store opened. It is still in business in 2014.[5]
Cocoa’s business district was destroyed by fire in 1890, but soon, significant development began to occur with the extension of the Jacksonville, St. Augustine, and Indian River Railway to Cocoa.[citation needed]
The city was chartered in 1895.[6] In the winter of 1894-1895, Cocoa experienced a second economic setback when the “Great Freeze” destroyed the citrus crop and forced many citrus workers to seek new occupations. According to one source, by 1903, the population of Cocoa had dropped to 382.
During the second decade of the 20th century, population growth and economic development in Cocoa accelerated. The state business directory of 1911-1912 set the population at 550. By 1925, the population was estimated at 1,800. During the Great Depression, the local economy declined and the two local banks failed. Still, by 1930, the population had risen to 2,200.[citation needed]