Instructions

14
17: O/P 1 INHIBIT N.O. (Output 1 Inhibit Control Input – Normally Open)
A Normally Open (N.O.) sensing input point for controlling the Output 1, with this terminal connecting to (-) ground, the
Egress Button, the group of User PINs and Cards for Output 1 are all disabled. It is prepared mainly for the cross
wire connection with the “Inter-lock O/P” point of the partner keypad in an Inter-lock system.
The inhibit function does not govern the Duress Codes and the Super User Codes. They are always valid.
18: INTER-LOCK O/P (Inter-lock Control Output)
An NPN transistor open collector output with maximum power rating of 24V DC/100mA sink. It is OFF at normal
condition and it switches to (-) ground immediately for the rst 5 seconds after keying in a valid User Code or reading
a card to operate Output 1, then, it will keep tying to (-) ground during the Door Position Sensor is open circuit due to
door opening. Use this output point to make cross wire connection with the partner keypad’s “O/P 1 Inhibit” point in an
Inter-lock system to prevent both doors can be opened at the same time.
An Inter-lock System:
An inter-lock system is a two-door system that always allows only one of the doors to open during the operation. While
one of the doors is opened, the other door keeps close until the open door is re-closed. It prevents the unauthorized
people dashing into a protected area while the doors are in use.
An inter-lock system needs two keypads and two door position sensing switches for the two doors.
19 - 20: TAMPER N.C. (Tamper Switch Normally Closed Contact)
A normally closed dry contact while the keypad is secured on its box. It is open while keypad is separated from the
box. Connect this N.C. terminal to the 24 hour protection zone of an alarm system if necessary.
The tamper switch in the DK-2882A and DK-2882B is activated by the xing screw of the front plate; in the
DK-2882C and DK-2882D it is activated by a magnet equipped on the back of the plastic box.