The door controllers can control from a single door up to twelve doors from a single controller, depending on the system being utilized. Most access control systems have the capability of controlling hundreds to thousands of doors through a single system. The door controllers are the devices that the reader, locking hardware, door contacts, local door alarms, and request to exit devices all interface with.
In the event of a software / head end computer failure the door controllers will continue to operate, however, no programming changes can be made until the head-end software is back on line. All door controllers are powered from a power source that has battery back-up power.
