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Mainly used to limit restricted persons to access the restricted floors of a building, in order to prevent the unrelated persons from going in or out, guarantee the building’s safety.
Operation Principle: directly connect the elevator’s button to input terminal of elevator controller by capture the control board of elevator, make the output terminal connect with the input of logic controller, which is in closed situation normally, and not receive any signals. While the card reader identify the effective cards, the relevant terminal opened, then press the button to select floors that would be arrived, to activate the output relays, the logic controller start work after receiving signals.
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