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DRY CONTACT
●
A dry contact means that no electricity is connected to it. It is prepared for free connec�ons. The
Relay Output contacts provided in this keypad system are dry contacts.
N.C.
●
Normally Closed, the contact is closed circuit at normal status. It is open circuit when ac�ve.
N.O.
●
Normally Open, the contact is open circuit at normal status. It is closed circuit when ac�ve.
TRANSISTOR OPEN COLLECTOR OUTPUT
●
An open collector output is equivalent to a Normally Open (N.O.) contact referring to ground
similar to a relay contact referring to ground. The transistor is normally OFF, and its output
switches to ground (-) when ac�ve. The open collector can only provide switching func�on for
small power but it is usually good enough for controlling of an alarm system. The Duress,
Inter-lock and Key Ac�ve/Alarm Outputs of the keypad are open collector outputs.
OPEN COLLECTOR
OUTPUT ----
Output switches to
ground when activated
AUXILIARY INFORMATION
EQUIVALENT
28
N.O. CONTACT
OUTPUT ----
Output switches to
ground when activated
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