Card readers are part of access control system. Card
readers read the information from the cards which are carried by the visitor & sends
this information to the central unit.
 Some of the
card readers are stand alone and they process the information themselves. Such stand alone
card readers are meant for single entry or exit point. These readers store the information
about authorised cards in their memory or that of the controller attached alongwith. If an
authorised card is presented or correct Password is punched then the reader gives a signal
for Door to open. The advanced versions can control the time in which the door must be
opened and for how long the door can remain open.
 For multiple entry and exit
points, normally, one card reader is installed on each of such points & the
information is then centrally processed by a control unit. It is possible to print this
information. If the system is to be used to control access as well as Attendance then two
readers are required on each door - one for entry and one for exit. All the transactions
of opening and closing of the door from different Readers is sent to a central process/PC,
from which appropriate reports can be printed. Having a single database simplifies the
addition/deletion of users.
Card readers allow for the interfacing with a printer for printing the reports. Depending
upon the size of organisation & type of cards, various card readers/technologies are
available in the market e.g. Swipe, Proximity, Infrared, Barcode etc. |
