Access monitoring systems - are difficult and multiplane electronic systems of safety, therefore precisely and unequivocally to formulate their appointment not simply. As a matter of fact, a usual door with the mechanical lock or a mechanical turnstile with the watchman too are some kind of access monitoring systems. First of all, electronic monitoring systems of access provide possibility of access of certain persons in certain premises and limit access of the persons who do not have access rights in corresponding zones.
The elementary electronic systems of access are code panels or independent input readers of cards. More difficult systems including, as a rule, one or several computers, can supervise access depending on current time, day of week and holidays. Such system keeps minutes of all events: passes of the certain user through a certain door during certain time, attempts of unapproved access etc. the Software allows to receive various kinds of reports on events, events in system for a certain interval of time. Besides, various systems can have a wide set of additional functions, for example, protection against unapproved penetration into a premise by card transfer to other person, graphic representation on the screen of the computer of the plan of object with display of disturbing situations etc.
As actuation mechanisms of the monitoring system of access electrolocks of various types, turnstiles, automatic doors, etc. can be used by Object of access can be not only the person, but also the car, with the special device fixed on it. Executive mechanisms of access in this case are barriers and automatic a drive of gate.
Except the direct function of differentiation of access the computerised systems can be used for the automatic account of working hours, the control of passage of the set route by the security guard, managements of various devices (sirens, illumination, etc.) depending on the events occurring in system. Many systems allow to connect gauges of the security and fire alarm system and to develop an alarm signal or to operate video observation system. For example, at input attempt in a premise of the illegal user (a presentation to system of an illegal card) will join the videorecorder and will fix actions of the malefactor.
For the organisations with a great number of employees and visitors within the limits of the access monitoring system workplaces on operative "extract" of admissions can be created. The data about visitors or new employees is brought in a database of the monitoring system of access, their powers on access to certain premises are defined and handed over a card-admission. Time of action of these cards can be limited, and even in case of forgetfulness of the visitor, through certain time, the card becomes a useless piece of plastic. In more difficult systems the photo of the owner of a card can be made and together with that necessary text or a different way to be put on a card. Thus the image will be stored in base and can be displayed the computer, for example, at a presentation of a corresponding card to the input reader on an entrance turnstile.