Card Access Control Systems

Card access control systems are normally more involved and generally have multiple doors that are tied into one large database. The database allows the system to be custom programmed to provide various levels and time frames of access to a multiple of individuals. Tracking of the individual cards is possible with generated reports. Individual cards can be terminated on a moments notice if the person is fired or quits. Additionally, the system may be programmed to allow suspension of an entire group of individuals, ( as in a strike condition ) for a period of time, and then reinstate the entire group at the end of the strike.

Access is allowed by use of a pre-programmed card or fob that is presented to the reader. The serial number of the card is read, compared to the database, and access is allowed or denied. The most popular cards and fob's are called "prox" ( short for proximity ). The way they work is, the reader emits an aura, once the card or fob enters this aura it is charged, then discharges a radio signal that carries it's own serial number. The reader receives and transmits the number to the main control and is dealt with accordingly. Because a card can be read from a distance, it often is not necessary to remove the card from a wallet or purse to be read ( this alone helps to safeguard lost cards ). Other types of cards are weigand and bar codes. Both of these cards are true swipe cards and need to be removed from a wallet, etc. To be used.