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(11) | EP 0 104 767 A3 |
| (12) | EUROPEAN PATENT APPLICATION |
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| (54) | Card reader for security system |
| (57) There is disclosed herein an improved card reader for a security system utilizing
a central controller and a plurality of card readers for controlling traffic through
critical doors in a facility. The improved reader includes means for improving the
system throughput by buffer storing large numbers of transactions all occurring within
a short time for time clock functions in time and attendance applications for hourly
employees. Also disclosed are means for conditioned emergency responses to sensed
changes in status of alarm contacts coupled to the reader and located in the vicinity
of the reader within 2 miles. There is also disclosed means for temporarily storing
transaction information for transactions made during periods when communications with
the controller are lost. During such degraded mode operation, access is granted to
cardholders with the proper system code and their ID code and the time of the transaction
are stored in a buffer. When communications are restored, the transactions saved in
the buffer are sent to the controller. |