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Autodialer alarm
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Autodialer alarm : ウィキペディア英語版
Autodialer alarm


An autodialer alarm, or community alarm as it is known in Britain when it is run by the County council, is an electronic device that usually has a push button transmitter, through which an individual may use to summon assistance to their location. These portable transmitters send a signal to the alarm unit. The transmitter is designed to be worn around the neck, on the wrist or clipped onto the clothing. Some brands offer additional methods of setting off the alarm such as a button on the alarm unit itself, wall buttons or pull cords. Some alarms will go off automatically if they detect smoke, an intruder, a low room temperature or if the individual hasn't moved in a while.
Once the button is pressed, the alarm unit will automatically contact a relative or friend or a special control centre. With most alarm systems it is possible for the person who answers the call to hear and talk to the individual, although this is not necessary as the alarm is raised by pushing the button.
When the device transmits to a control centre, personal information of the owner will automatically appear on a computer terminal in front of the operator. They will usually try to speak to the individual, often via an intercom channel that is opened up when the alarm is activated, and if the individual needs help or they cannot get a reply, then they will arrange for someone to visit.
An alarm which dials directly through to a relative's or friend's house will usually be programmed to dial more than one number, to increase the chances of finding someone at home.
An autodialer alarm is different from an alarm autodialer, part of a wall alarm.
==Connection methods==
There are five main interfaces on a community alarm base unit.
# The electricity supply, which runs the unit and charges up internal batteries so the alarm works even if the mains have been off for a few hours.
# Phone line, which the base station uses to signal the alarm to the control centre or telephone. When communicating with a control centre, the base station's identity is communicated to the control centre's computer system, often using DTMF. The name and address, as well as other information stored on the control centre's database, are displayed on the operator's computer terminal. The base station also transmits the source within the house of the alarm.
# Aerial, to receive the RF alarm signal from the pendant.
# Alarm button on base unit, in case the pendant is lost.
# Alarm contacts, so the base unit can be connected to smoke or gas detectors.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
ウィキペディアで「Autodialer alarm」の詳細全文を読む



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