Linear access ak-21 User Manual

Linear’s AK-21 is a digital keyless entry system designed for access control 
applications. The keypad is housed in a rugged, plastic enclosure and is designed 
to be mounted in a standard single-gang electrical box. The die-cast keys have 
bright, easy-to-read yellow graphics.
The Model AK-21 is supplied with four different plastic snap-on mounting bezels to 
customize the look of the keypad. The satin-chrome bezel comes factory installed 
on the keypad. The white, ivory & bronze bezels are packaged separately. 
Up to 480 entry codes, from 1 to 6 digits in length, can be programmed. They can 
activate either, or both, of the relay outputs. The “anti-passback” feature prevents 
using the same code again before the programmed time elapses.
All system indicators and lights are long-lasting, solid-state LEDs. Two indicators 
show the status of the entry system. The left indicator lights red to indicate power, 
then turns green when access is granted. The right indicator lights yellow when 
the keypad is in “lockout” condition (from too many incorrect code entries). The 
keypad’s courtesy light dimly illuminates the keys at all times. The courtesy light 
brightly illuminates the keys for two minutes after any key is pressed. An internal 
sounder beeps when each key is pressed. An internal jumper sets the sounder 
volume high or low.
The  SENSE input can be used two ways. If programmed for “door sense” the 
input is wired to a normally closed switch on the door to detect when the door is 
open or closed. Forced entry or door ajar situations can then be detected. Using 
door sense, the “Auto-relock” feature will prevent “tailgating” by turning off the 
Main Relay output immediately when the door is closed after access has been 
granted. If the SENSE input is programmed for “inhibit”, the input can be wired 
to a “service” switch or automatic timer that will disable the Main Relay when 
required.
The  REQUEST-TO-EXIT input can be wired to a pushbutton to provide 
codeless activation of Main Relay, Auxiliary Relay, Output #3, or Output #4 
(programmable).
The ALARM SHUNT output activates when access is granted. This output can 
be wired to shunt alarm contacts on the access door/gate to prevent triggering of 
an alarm when authorized access occurs.
The AK-21 is powered from a 12-24 Volt AC or DC source. Power can be obtained 
from the access device or a separate power supply. The EEPROM memory 
retains all entry codes and programming, even without power. An internal jumper 
is provided to reset the master code. The Main Relay has a 5 Amp capacity. 
The Auxiliary Relay has a 1 Amp capacity. Two solid state outputs, capable of 
switching 100 mA to common, are programmable to signal forced entry, door ajar, 
lockout, alarm circuit shunting, request-to-exit, and keypad active conditions.

✓ FOUR INTERCHANGEABLE KEYPAD BEZELS

✓ KEYPAD PROGRAMMABLE

✓ 480 ENTRY CODE CAPACITY

✓ 1-6 DIGIT ENTRY CODE LENGTH

✓ 4 INDEPENDENT OUTPUTS (TIMED/TOGGLED)

✓ 4 INDEPENDENT TIMERS

✓ TWO FORM “C” (N.O. & N.C) RELAY CONTACTS

✓ EACH ENTRY CODE CAN ACTIVATE EITHER OR BOTH RELAYS

✓ TWO SOLID STATE OUTPUTS

✓ TWO STATUS INDICATORS (2-COLOR RED/GREEN & YELLOW)

✓ WHITE SOLID-STATE LED COURTESY LAMP

✓ PIEZO SOUNDER (TWO SELECTABLE VOLUME LEVELS)

✓ TIMED ANTI-PASSBACK

✓ AUTO-RELOCK

✓ KEYPAD LOCKOUT

✓ TACTILE KEY FEEL

✓ DOOR SENSE INPUT

✓ INHIBIT INPUT

✓ REQUEST-TO-EXIT INPUT

✓ KEYPAD CAN BE POWERED FROM 12-24 VOLTS AC OR DC

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