Perle Systems Application Note
Access Control for Personnel Entrances
Most access control systems for personnel access utilize a serial
connection between the access control computer and the card reader/clock.
This restricts the distance between these to be no more than 20 meters and
may require the use of multiple access control computers. By connecting the
card readers over an Ethernet network using a serial device server, a single
computer can now read and control each reader, resulting in a more secure
system and reduced costs through increased efficiencies in employee database
management.
Device Servers with Integrated I/O Control
In addition, a device server with digital IO can extend the security of the
system by providing centralized control from the access control computer
to open doors, open gates or sound alarms.
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