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The timer and key switch are optional. The key switch allows you to engage the entrance loop manually. The timer will allow a 7 day program to engage the entrance loop at any given time and days of week. The key switch is often used in conjunction with the timer to deactivate entrance loop at will.
Most Doorking operators and Elite CSW-200 & SL-3000 have dedicated plug in loop detector modules. You can add a separate loop detector for entrance loops and connect it to the key (trigger) input on these units.