The primary purpose of a security system is to deter intruders. It does this by identifying their presence by the use of detection devices (see below). It can then sound sirens, activate blue lights and/or transmit an alarm signal to a control room. The control room would then implement the appropriate response as arranged with the client.
The method of detecting intruders is achieved through a wide range of detection devices - motion sensors, glass break sensors, door contacts, seismic sensors, holdup switches, tamper switches and much more.
With improvements in microprocessors we have seen big advances in the capabilities of security systems. The control panels process events faster and have expanded memories for more alarm codes and system functionality. With these advancements come opportunities to incorporate medical alarms, duress alarms and monitored smoke detectors into the one system.
Broadly speaking there are two types of systems continue reading for more details.
In the event of an alarm activation, as well as sounding onsite sirens and activating a blue strobe light for a pre-determined time, a monitored system has the added benefit of sending a signal to an A1 Graded Control Room. This signal allows all alarm events to be transmitted to the control room. Upon receiving this event the control room will implement whatever procedure the client has requested, for example - call after hours recalls or send a patrol man. A monitored system can not only identify the source of the alarm event (sensor) and how many times it has activated, it can also communicate essential information as to system power status, battery condition, detection device status, automatic communication test reports, identification of the person who switched alarm on or off plus much more.
In the event of an alarm activation this system would also sound onsite sirens and activate a blue strobe light but does not send a signal to a control room. Therefore, it is not possible to have anyone attend to the break-in unless a third party nearby hears the alarm and actions it. Also, there are no capabilities to eliminate human error in remembering to switch the alarm on or to determine who switched the alarm on or off and at what time etc.