The alarm system can be compared to a sentry who is guarding your home, office or another facility. However, unlike a human, it never gets tired. The alarm system is always alert, does not have to sleep and can protect its belongings throughout 24 hours a day.
Naturally, the burglary and assault signalling system, similarly to the sentry, will work differently depending on the situation. You can indicate the three most important system states: lack of vigilance, vigil, and alarm. A not watchful system is like a sentry, who has been instructed not to pay attention to people who enter and leave. On the other hand, if the sentry receives a command not to allow unauthorised people to enter the premises, the situation will change.
Similarly, with the alarm system, in which vigil has been enclosed. From now on, registering the presence of people on the premises will trigger an alarm. The alarm system consists of a number of electronic devices. To create the simplest system, we will need an alarm control panel, a control device, detectors and signalling devices. It would also be useful to have a telephone line and a computer which is present in most households now a day.