Proximity cards and readers are the most commonly used Access Control system these days. The name proximity is derived from the fact that there is no direct contact between the card and the sensor unlike some of the older technologies.
The proximity card can read from the range of 4" to 2 feet depending on the type of reader used (either short or long range). The cards are available in 26 bit or 32 bit weigand formats.
The card emits a signal, which is read by the card reader. Every card has a unique number and comes with a facility code, which is unique to the particular facility. These will be linked to the employee register to obtain daily and monthly reports.
The card is programmed in the system, and when the card is swiped it is checked for authenticity and the access is granted. This in turn actuates various access devices/barriers.
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The Smart Cards as the name suggests are an active device and have a memory chip attached to it to store the data. These cards are used not only for access but other applications like cash vending centers, canteen applications etc.
The cards are available either in a contact or contact less format. These cards are used in conjunction with smart card readers / writers.