Linear Automobile Electronics AK 21 User Manual

AK-21  
Digital Keyless  
Entry System  
Installation and Programming Instructions  
(760) 438-7000  
USA & Canada (800) 421-1587 & (800) 392-0123  
Toll Free FAX (800) 468-1340  
 
COMPONENT LOCATIONS  
MASTER CODE  
RESET JUMPER  
(JP2)  
RED/GREEN  
POWER/ACCESS  
INDICATOR  
YELLOW  
"LOCKOUT"  
INDICATOR  
TERMINAL  
BLOCK #2  
(TB2)  
BEZEL  
SOLID STATE  
WHITE LED  
DOWN LIGHT  
TERMINAL  
BLOCK #1  
(TB1)  
FACEPLATE  
KEYPAD  
BEEPER  
LEVEL  
JUMPER (JP1)  
MOUNTING  
PLATE  
Figure 1. Component Locations  
WIRING DIAGRAM  
TYPICAL DOOR INSTALLATION WIRING  
AK-21 TERMINALS  
TERMINAL  
BLOCK 2  
TERMINAL  
BLOCK 1  
12-24 VOLT  
AC OR DC  
POWER  
1 - AC OR DC  
SENSE - 8  
COM - 7  
POWER  
SUPPLY  
N.C. DOOR  
SWITCH  
2 - AC OR DC  
3 - N.O.  
REQUEST-TO-EXIT - 6  
EARTH GROUND - 5  
OUTPUT #3 COM - 4  
OUTPUT #3 - 3  
MAIN RELAY  
5 AMPS @  
28 VDC MAX.  
4 - COM  
5 - N.C.  
6 - N.O.  
7 - COM  
8 - N.C.  
REQUEST  
TO EXIT  
BUTTON  
ELECTRIC  
DOOR  
STRIKE  
AUXILIARY  
AUXILIARY  
RELAY 1 AMP  
@ 28 VDC MAX.  
OUTPUTS  
100 mA MAX.  
TO COMMON  
OUTPUT #4 - 2  
OUTPUT #4 COM - 1  
GROUND  
STAKE  
TO ALARM  
SYSTEM  
ALARM  
CONTACT  
CAUTION  
REQUIRED WIRING  
NOTES:  
1. ALARM SHUNT SET FOR AUXILIARY RELAY  
2. TERMINAL BLOCK #2, TERMINAL 8 SET FOR DOOR SENSE  
IF THE UNIT IS AC POWERED,  
MAKE SURE THE SECONDARY OF THE  
SYSTEM TRANSFORMER IS ISOLATED  
FROM EARTH GROUND  
OPTIONAL WIRING  
OTHER WIRING  
Figure 2. Wiring Diagram  
1
 
Install the Electrical Box and Mounting Plate  
The keypad is designed to fit into a standard single-gang electrical  
box. Select a location near the controlled door and choose a  
convenient height for the keypad. Be sure there is good wiring  
accessibility for the unit’s power and the output to the door strike  
or access device.  
INSTALLATION  
Before installing the keypad, the unit must be partially  
disassembled to access the mounting plate. The keypad’s bezel  
can be exchanged for a different color when the keypad is apart.  
Opening the Keypad  
The keypad assembly is secured with two tamper-resistant screws  
that are hidden behind the keypad’s faceplate. Refer to Figure 3 for  
disassembly details.  
Install the electrical box in the wall.  
Screw the mounting plate onto the electrical box (see  
Figure 5).  
Use a small flat blade screwdriver to pry off the keypad’s  
faceplate.  
Use the special allen wrench (supplied) to remove the two  
tamper-resistant screws.  
Separate the mounting plate from the keypad assembly.  
INSTALL A SINGLE-GANG  
ELECTRICAL BOX AT THE  
PROPER LOCATION  
FOR THE KEYPAD  
PRY UP ON THE  
FACEPLATE HERE  
1
REMOVE THE  
FACEPLATE  
2
MAKE SURE THE  
TAB IS UP  
ATTACH THE MOUNTING  
PLATE TO THE  
ELECTRICAL BOX  
MOUNTING  
PLATE  
MOUNTING  
PLATE  
Figure 5. Installing the Mounting Plate  
3
REMOVE THE  
TWO SCREWS  
SEPARATE THE  
MOUNTING PLATE  
FROM THE KEYPAD  
4
Final Keypad Installation  
After wiring the keypad (see next page), complete the installation  
by securing the keypad to the mounting plate.  
Figure 3. Opening the Keypad  
If a lower beeper sound level is required, before installing  
the keypad, remove Jumper JP1 (place the jumper block on  
one pin to save the jumper).  
Changing the Keypad’s Bezel  
The colored keypad bezels snap onto the keypad assembly. Refer  
to Figure 4 for details on changing the bezel.  
Hook the keypad assembly onto the mounting plate tab (see  
Figure 6).  
Gently pull on the edge of the bezel to release the tabs that  
hold the bezel to the keypad assembly.  
Remove the bezel from the keypad assembly.  
Use the special allen wrench (supplied) to install the two  
tamper-resistant screws.  
Fit the bottom tab on the faceplate into the slot on the  
Choose the proper color bezel for the installation and snap  
keypad then snap the top of the faceplate in.  
it onto the keypad assembly.  
1
HOOK THE KEYPAD ASSEMBLY  
ONTO THE MOUNTING PLATE  
2
INSTALL THE  
TWO SCREWS  
KEYPAD BEZEL COLORS:  
KEYPAD  
BEZEL  
SATIN-CHROME (FACTORY INSTALLED)  
·
·
·
·
WHITE  
IVORY  
BRONZE  
KEYPAD  
ASSEMBLY  
4
THE BEZEL SNAPS  
ONTO THE KEYPAD  
ASSEMBLY  
SNAP THE TOP  
OF THE KEYPAD  
INTO PLACE  
3
FIT THE BOTTOM TAB OF  
THE FACEPLATE INTO THE  
SLOT ON THE KEYPAD  
Figure 6. Connecting the Keypad to the Mounting Plate  
Figure 4. Changing the Outer Bezel  
2
 
Keypad Wiring  
2 WIRES  
FOR DOOR  
SENSE  
DOOR  
SENSE  
SWITCH  
See Figure 7 for an example of a basic door installation. The  
keypad is mounted adjacent to the door. An electric door strike  
is mounted in the door jamb to release the door lock. A magnetic  
switch is mounted on the top of the door jamb for detecting when  
the door is open.  
SWITCH  
Use the following steps to wire the keypad. Refer to the wiring  
diagram shown in Figure 8 to assist in the wiring.  
2 WIRES  
FOR DOOR  
STRIKE  
AK-21  
KEYPAD  
NOTE: Up to 500 feet of 18 AWG wire can be run for power,  
use larger wire for longer runs. Use 22 AWG or larger  
(depending on the load) for other connections.  
2 WIRES  
FROM  
POWER  
SUPPLY  
OUTPUT  
Install a low voltage electric door strike for unlocking the  
door.  
Route two wires between the door strike and the keypad  
box. Connect one of the door strike wires to the keypad’s  
MAIN RELAY N.O. terminal (TB2 #3). Connect the other  
door strike wire to the keypad’s AC/DC + terminal (TB2 #1).  
Connect a wire between the keypad’s AC/DC - terminal  
(TB2 #2) and the MAIN RELAY COM terminal (TB2 #4).  
ELECTRIC  
DOOR  
STRIKE  
1 WIRE  
TO EARTH  
GROUND  
Figure 7. Basic Door Installation  
POWER  
Choose a location for the power supply or transformer.  
Route two wires between the power supply and the keypad  
box. Connect the power supply’s output terminals to the  
keypad’s AC/DC input terminals (TB2 #1 & #2). Observe  
wiring polarity if using DC.  
CAUTION: If the unit is AC powered, make sure the  
secondary of the system transformer is isolated from  
earth ground.  
TERMINAL  
BLOCK 2  
12-24 VOLT  
AC OR DC  
POWER  
1 - AC OR DC  
2 - AC OR DC  
SUPPLY  
3 - N.O.  
MAIN  
RELAY  
5 AMPS MAX.  
4 - COM  
ELECTRIC  
DOOR  
STRIKE  
5 - N.C.  
6
7
8
EARTH GROUND  
To avoid damage to the unit from static discharges, connect  
the EARTH GROUND terminal (TB1 #5) to a good earth  
grounding point. Suggested wiring size is 18 AWG for earth  
ground.  
TERMINAL  
BLOCK 1  
AK-21 REAR VIEW  
N.C. DOOR  
SENSE  
SWITCH  
SENSE - 8  
SENSE INPUT  
COM - 7  
TERMINAL  
BLOCK 2  
(TB2)  
6
NOTE: SENSE terminal (TB1 #8) can be programmed for  
either a door sense or inhibit input. Both features cannot be  
used at the same time.  
To use the door sense feature to detect forced entry or door  
ajar conditions, install a normally closed door switch on the  
door and route two wires from the switch to the keypad box.  
Connect the door switch to the keypad’s SENSE terminal  
(TB1 #8) and COM terminal (TB1 #7).  
EARTH GROUND - 5  
4
GROUND  
STAKE  
3
TERMINAL  
BLOCK 1  
(TB1)  
2
1
Figure 8. Basic Door Installation Wiring  
If an inhibit switch or timer is going to be used for  
temporarily disabling the keypad, route two wires from  
the switch or timer to the keypad box. Connect the inhibit  
switch/timer normally open terminals to the keypad’s SENSE  
(TB1 #8) and COM (TB1 #7) terminals.  
OUTPUT #3 LIGHTS AN LED  
OUTPUT #4 LIGHTS AN LED AND SOUNDS A BEEPER  
EXAMPLE #1  
DC  
POWER  
SOURCE  
1
ELECTRONIC  
BEEPER  
TERMINAL  
BLOCK #2  
REQUEST-TO-EXIT INPUT (wiring shown on Page 1, Figure 2)  
If a request-to-exit pushbutton is going to be used, route two  
wires from the keypad box to a normally open pushbutton  
mounted on the secure side of the door. Connect the wires  
to the pushbutton and to the keypad’s EXIT (TB1 #6) and  
COM (TB1 #7) terminals.  
1K  
2K  
Ω
Ω
@ 12 volts  
@ 24 volts  
TERMINAL  
BLOCK #1  
LED  
LED  
OUTPUT #3  
3
EACH  
OUTPUT  
100 mA  
MAXIMUM  
OUTPUT #4  
2
OUTPUT #3 LIGHTS A LAMP POWERED FROM AN EXTERNAL SOURCE  
OUTPUT #4 TRIGGERS A NORMALLY OPEN ALARM PANEL ZONE  
Solid State Outputs  
EXAMPLE #2  
OUTPUT #3  
OUTPUT #4  
The two solid state outputs (Output #3 & Output #4) can be  
programmed to activate during various conditions. These outputs  
can be used to activate indicators or sounders. See Figure 9 for  
wiring examples using the solid state outputs.  
3
LOW VOLTAGE  
LAMP  
N.O. ZONE  
ALARM PANEL  
COMMON  
2
END-OF-LINE  
RESISTOR  
POWER  
SOURCE  
OUTPUT #4 COM  
1
4
OUTPUT #3 COM  
Figure 9. Using Solid State Outputs  
3
 
FACTORY DEFAULTS  
Adding a New Entry Code  
MASTER PROGRAMMING CODE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .123456  
ENTRY CODE LENGTH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 DIGITS  
REQUEST-TO-EXIT OUTPUT RELAY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .MAIN RELAY  
ALARM SHUNT OUTPUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . DISABLED  
FORCED ENTRY OUTPUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . OUTPUT #3  
DOOR AJAR OUTPUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . OUTPUT #4  
MAIN RELAY ON TIME. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 SECONDS  
AUXILIARY RELAY ON TIME. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 SECONDS  
SOLID STATE OUTPUT #3 ON TIME. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 SECONDS  
SOLID STATE OUTPUT #4 ON TIME. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 SECONDS  
DOWNLIGHT ON TIME . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 MINUTES  
DOOR SENSE/INHIBIT INPUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . DOOR SENSE  
KEYPAD LOCKOUT OUTPUT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . DISABLED  
KEYPAD ACTIVE OUTPUT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . DISABLED  
BEEPER SOUNDS WHEN KEY PRESSED. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . YES  
BEEPER SOUNDS DURING RELAY #1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . NO  
BEEPER SOUNDS DURING RELAY #2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . NO  
BEEPER SOUNDS DURING OUTPUT #3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . NO  
BEEPER SOUNDS DURING OUTPUT #4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . NO  
KEYPAD LOCKOUT COUNT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 TRIES BEFORE LOCKOUT  
ANTI-PASSBACK TIME . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . NO ANTI-PASSBACK  
AUTO-RELOCK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ON  
Press: 01 # Code # Code # Action #  
Code = The new entry code: 1-999999, depending on code length  
Action = Relay output entry code will activate as follows:  
1 = Relay #1, timed open  
2 = Relay #2, timed open  
3 = Both Relays, timed open  
10 = Relay #1, toggled  
20 = Relay #2, toggled  
30 = Both Relays, toggled  
12 = Relay #1 toggled; Relay #2, timed open  
21 = Relay #1 timed open; Relay #2 toggled  
The yellow LED will flash quickly while the AK-21 searches its  
memory for available space and duplicate entries. The green LED  
will light when the new code is stored.  
If the new entry code chosen is already being used for another  
entry code, the red LED will light. A new unique code needs to be  
entered.  
NOTE: Leading zeros (zeros before the code number, i.e. 0001) do not need  
to be entered when programming a new entry code.The AK-21 will internally  
add any zeros to fill all digits determined by the entry code length setting.  
Leading zeros will have to be entered by the user when entering their code  
to gain access.  
Erasing a Single Entry Code  
BASIC PROGRAMMING  
Press: 0 2 # Code # Code #  
When the AK-21 is in Programming Mode, both indicators will turn  
off until programming begins. After a programming option number  
is entered the yellow indicator will blink.This shows that the AK-21  
is ready to accept the new programming data. After the new data  
entry is complete, the yellow indicator will flash while the data is  
being stored. The green indicator will light if the data is accepted.  
The red indicator will light if any programming data is entered  
incorrectly, and the command will have to be fully re-entered.  
Code = The entry code to delete.  
The yellow indicator will flash quickly while the AK-21 searches its  
memory for the code to erase. The green indicator will light when  
the code is erased.  
Erasing All Entry Codes  
WARNING: PERFORMING THIS COMMAND WILL  
Entering Programming Mode  
The 6-digit Master Programming Code (default = 123456) is used to enter  
Programming Mode.  
REMOVE ALL ENTRY CODES FROM THE MEMORY.  
Press: 9 7 # 0 0 0 0 0 0 # 0 0 0 0 0 0 #  
NOTE: The green indicator will light while the memory is being erased.This  
may take up to 15 seconds.  
Press: # 9 # Master Code  
Master Code = the current 6-digit Master Programming Code  
Changing the 6-Digit Master Programming Code  
Exiting Programming Mode  
Press: 9 8 # Master Code # Master Code #  
Master Code = The new 6-digit Master Programming Code  
Press: * * #  
The red indicator will light after exiting Programming Mode.  
NOTE: The AK-21 will automatically exit Programming Mode after two  
minutes of inactivity.  
New master code: _____________________  
Re-entering a Command After a Mistake  
If the red indicator lights, signaling an incorrect entry, or an incorrect key is  
pressed during programming, to clear the keypad and re-enter the command:  
Press: * 9 #  
Setting Entry Code Length  
Default: 4 digits  
Press: 0 3 # Length #  
Length = 1 - 6 for entry code length  
NOTE: If the Entry Code Length is going to be changed from the factory  
default of four digits, make this change first, before programming any  
entry codes.  
4
 
PROGRAMMING OPTIONS  
There are several AK-21 programming options. For most  
installations, the factory set default options are sufficient. The  
keypad must be in Programming Mode to make these changes.  
Select Request-to-Exit Output  
Sets which output activates when the Request-to-Exit input is grounded. This  
Default: Main Relay  
output may be timed or toggled.  
Press: 1 6 # Output #  
Output = Output to Activate (0-4)  
1 = Main Relay, 2 = Auxiliary Relay, 3 = Output #3, 4 = Output #4, 0 = No Output  
Select Door Sense or Inhibit Input Default: Door Sense  
The input on Terminal Block TB1, Terminal #8 can be programmed for DOOR  
SENSE or INHIBIT.  
Main Relay On-time  
Sets the length of time the Main Relay activates when triggered.  
Default: 2 Seconds  
Press: 1 0 # Input #  
Input = 0 for Door Sense, = 1 for Inhibit  
Press: 2 1 # Seconds #  
Seconds = Output time in seconds (0-60)  
When programmed for DOOR SENSE, if an open condition on the input occurs  
before access is granted (with an entry code or with the request-to-enter input) a  
FORCED ENTRY output will occur. If an open condition remains 60 seconds after  
a relay activation for access, a DOOR AJAR output will occur.  
Auxiliary Relay On-time Default: 2 Seconds  
Sets the length of time Auxiliary Relay activates when triggered.  
When programmed for INHIBIT, a closed condition on the input will prevent  
Relay #1 from activating when access is requested with an entry code.This mode  
is typically used with an external timer to disable the access device at certain  
times.  
Press: 2 2 # Seconds #  
Seconds = Output time in seconds (0-60)  
Select Forced Entry Output Default: Output #3  
Sets which output activates if the DOOR SENSE input opens before access is  
Solid-state Output #3 On-time Default: 2 Seconds  
Sets the length of time Output #3 activates when triggered.  
granted. This output is not timed.  
Press: 2 3 # Seconds #  
Seconds = Output time in seconds (0-60), 99 = Toggle Mode  
Press: 1 1 # Output #  
Output = Output to Activate (0-4)  
1 = Main Relay 2 = Auxiliary Relay 3 = Output #3 4 = Output #4 0 = No Output  
Solid-state Output #4 On-time Default: 2 Seconds  
Sets the length of time Output #4 activates when triggered.  
Select Door Ajar Output  
Sets which output activates if the DOOR SENSE input stays open 60 seconds  
after access is granted. This output is not timed.  
Default: Output #4  
Press: 2 4 # Seconds #  
Seconds = Output time in seconds (0-60), 99 = Toggle Mode  
Press: 1 2 # Output #  
Output = Output to Activate (0-4)  
1 = Main Relay, 2 = Auxiliary Relay, 3 = Output #3, 4 = Output #4, 0 = No Output  
Set Downlight On-Time  
Sets the time duration that the downlight remains on after a key press.  
Default: 2 Minutes  
Press: 2 5 # Duration #  
0 = Always off, 1 = 1 minute, 2 = 2 minutes, 3 = 3 minutes,  
4 = 4 minutes, 99 = Always on  
Select Keypad Lockout Output  
Sets which output activates when the keypad is “locked out” after too many  
Default: No Output  
incorrect entry code attempts. The lockout time is 60 seconds.  
Beep Sounds on Keystrokes  
Selects whether or not the keypad beeps as each key is pressed.  
Default: Yes  
Press: 1 3 # Output #  
Output = Output to Activate (0-4)  
1 = Main Relay, 2 = Auxiliary Relay, 3 = Output #3, 4 = Output #4, 0 = No Output  
Press: 4 0 # Sound #  
Sound = 1 for Yes, = 0 for No  
Select Keypad Active Output  
Sets which output activates when any keys are pressed. This output is timed. If  
Default: No Output  
Beep Sounds During Main Relay  
Selects whether or not the keypad beeps during Main Relay activation.  
Default: No  
toggle mode is selected for the output, the timer value defaults to 2 seconds.  
Press: 4 1 # Sound #  
Sound = 1 for Yes, = 0 for No  
Press: 1 4 # Output #  
Output = Output to Activate (0-4)  
1 = Main Relay, 2 = Auxiliary Relay, 3 = Output #3, 4 = Output #4, 0 = No Output  
Select Alarm Shunt Output  
Default: No Output  
Sets which output activates during the time access is granted. (Use this output  
to shunt alarm contacts attached to the access door.) This output may be timed  
or toggled.  
Press: 1 5 # Output #  
Output = Output to Activate (0-4)  
1 = Main Relay, 2 = Auxiliary Relay, 3 = Output #3, 4 = Output #4, 0 = No Output  
5
 
AK-21 OPERATION  
Keypad users request access by entering their code.  
Beep Sounds During Auxiliary Relay  
Selects whether or not the keypad beeps during Auxiliary Relay activation.  
Default: No  
Users of the AK-21 have up to 40 seconds to key in their  
Press: 4 2 # Sound #  
Sound = 1 for Yes, = 0 for No  
entry code.  
Up to eight seconds are allowed between each keystroke.  
All digits of the entry code must be entered. Example: If the  
code is 0042, the user must enter  
“0 0 4 2”.  
Beep Sounds During Output #3  
Selects whether or not the keypad beeps during Output #3 activation.  
Default: No  
If the wrong key is pressed, pressing the * key will reset the  
Press: 4 3 # Sound #  
keypad. The correct code can then be re-entered.  
After a correct code is entered, the red indicator will turn  
green and the programmed relay will activate for the  
programmed time.  
If the number of incorrect codes entered exceeds the  
keypad lockout count, the yellow indicator will light,  
indicating that the keypad is locked out. The lockout will  
remain for one minute.  
Sound = 1 for Yes, = 0 for No  
Beep Sounds During Output #4  
Selects whether or not the keypad beeps during Output #4 activation.  
Default: No  
Press: 4 4 # Sound #  
Sound = 1 for Yes, = 0 for No  
After a valid code has been entered, it will be unusable until  
the anti-passback time expires.  
Keypad Lockout Count  
Sets the number of incorrect entry code attempts allowed before the keypad  
Default: 3 Tries  
SPECIFICATIONS  
MECHANICAL  
“locks out”.  
Dimensions: 3.00” W x 5.00” H x 3.00” D  
ELECTRICAL  
Press: 5 0 # Attempts #  
Attempts = Number of attempts before lockout (2-7)  
Voltage: 12-24 Volts AC or DC  
Current: 30 mA typical, 150 mA maximum  
Outputs: Main Relay:  
Anti-passback Time Default: No Anti-passback  
Sets the length of time an entry code will not function after it is used.  
Form “C” 5 Amps @ 28 Volts maximum  
Auxiliary Relay:  
Press: 5 1 # Minutes #  
Minutes = Time in Minutes (1-4), 0 = No Anti-passback  
RESETTING KEYPAD  
Form “C” 1 Amp @ 28 Volts maximum  
Solid state outputs (Outputs #3 & #4):  
Short-to-common 100 mA @ 24 VDC maximum  
ENVIRONMENTAL  
Master Reset  
Temperature: -22°F to 149°F (-30°C to 65°C)  
Humidity: 5% to 95% non-condensing  
CAUTION: Performing a master reset will clear  
the entire memory of the AK-21 and return all  
programmable options to the factory default values.  
ALL ENTRY CODES WILL BE ERASED.  
STEP 1 Disconnect power from the keypad.  
STEP 2 Press and hold down the * and # keys.  
STEP 3 Apply power to the keypad, continue holding the keys  
down until the red indicator starts flashing.  
STEP 4 Release the keys. The red and yellow indicators will  
remain lit until the process is complete, then the yellow  
indicator will go out.  
LINEAR LIMITED WARRANTY  
This Linear product is warranted against defects in material and workmanship for twenty-  
four (24) months. The Warranty Expiration Date is labeled on the product. This warranty  
extends only to wholesale customers who buy direct from Linear or through Linear’s normal  
distribution channels. Linear does not warrant this product to consumers. Consumers  
should inquire from their selling dealer as to the nature of the dealer’s warranty, if any.  
There are no obligations or liabilities on the part of Linear LLC for consequential  
damages arising out of or in connection with use or performance of this product  
or other indirect damages with respect to loss of property, revenue, or profit, or  
cost of removal, installation, or reinstallation. All implied warranties, including implied  
warranties for merchantability and implied warranties for fitness, are valid only until Warranty  
Expiration Date as labeled on the product. This Linear LLCWarranty is in lieu of all other  
warranties express or implied.  
Resetting the Master Code  
STEP 1 Open the AK-21 case.  
STEP 2 Locate jumper JP2. This jumper is used to reset the  
master code.  
All products returned for warranty service require a Return Product Authorization Number  
(RPA#). Contact Linear Technical Services at 1-800-421-1587 for an RPA# and other  
important details.  
STEP 3 With power applied to the keypad, remove jumper JP2.  
The keypad will begin to beep, signaling that the code  
has been reset.  
FCC NOTICE  
Changes or modifications not expressly described in this manual or approved by the  
manufacturer could void the user’s authority to operate the equipment.  
STEP 4 Replace jumper JP2.  
This equipment has been tested and found to comply with the limits for a Class B digital  
device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide  
reasonable protection against harmful interference in a residential installation. This  
equipment generates, uses and can radiate radio frequency energy and, if not installed  
and used in accordance with the instructions, may cause harmful interference to radio  
communications. However, there is no guarantee that interference will not occur in a  
particular installation. If this equipment does cause harmful interference to radio or  
television reception, which can be determined by turning the equipment off and on, the user  
is encouraged to try to correct the interference by one or more of the following measures:  
THE MASTER PROGRAMMING CODE IS NOW 123456.  
• Reorient or relocate the receiving antenna.  
• Increase the separation between the equipment and receiver.  
• Connect the equipment into an outlet on a circuit different from that to  
which the receiver is connected.  
• Consult the dealer or an experienced radio/TV technician for help.  
Copyright © 2007 Linear LLC  
228045 A  
 

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