Glens Key Lock & Safe Company
1147 South State Street, Salt Lake City, Utah 84111-4596 USA 

Phone 801.413.0577    Toll Free 800.451.9727    Fax 801-355-3414
Business Hours Mobile:
Monday - Friday
8:00 - 5:30
Business Hours Shop:    Monday - Friday 8:30 - 5:30
 Saturday 10:00 - 3:00

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What are they and why do I need them?

(Here are some general rules to controllers).

A controller is a device which makes the decisions at each door in an access control system.
It is essentially the brains of your system.
A Controller may be integrated with the reader on the outside of the door (unsecured version)
or mounted on the inside of the building (secured version).
audit trails (each use of  the door) are retained in the controller.
Controllers can work independently or be linked together.
Some controllers can work with various reader technologies.

For more information on controllers
link to these sites: