The Model AK-21 Interior
Digital Keypad 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
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.
Relay #1 has a 5 Amp capacity. Relay #2 has a 1 Amp capacity. The relays
can be set for timed or latch-on/latch-off toggle operation per each
individual entry code. The on or off toggle state of a relay is
maintained even after power interruption. When power is restored to the
keypad, each relay will assume the state it was in when power was
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 can be programmed to activate indefinitely, or for 1, 2, 3, or 4
minutes after the last key press, or not light at all. An internal
sounder beeps when each key is pressed. An internal jumper sets the
sounder volume high or low.
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) for authorized personnel. The “anti-passback” feature
prevents using the same code twice before the programmed time elapses.
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. 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-enter, and keypad active conditions.
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.