Overview of Linear AK-11 Keypad

The Linear AK‑11 keypad is a cast‑aluminum, surface‑mount device offering 480 programmable codes, each 1–6 digits. It features dual LEDs for status, a relay output for door or gate control, and a 12‑V DC power input. The manual PDF details mounting, wiring, and programming steps. Secure entry.

Key Features and Specifications

• 480 user‑programmable codes (1–6 digits) with a dedicated relay output for door, gate, or alarm activation.
• Cast‑aluminum housing, 5‑inch diameter, 1‑inch thick panel, rated IP65 for weather and vandal resistance.
• Dual LED status indicators: red for power and programming mode, yellow for successful code entry, green for relay activation.
• 12 V DC input (9–18 V) with a built‑in 5‑A fuse; power cable includes a 3‑wire (V+, GND, Signal) connector.

• 2‑way communication via RS‑232/RS‑485 serial port for remote programming and status monitoring.
• Built‑in 4‑digit backlit LCD for code entry confirmation and error messages.
• 10‑second timeout for idle mode, with optional auto‑lock feature through firmware.
• Supports up to 8 relay outputs, each controllable via separate programming commands.
• Firmware version 1.2.3, upgradeable via USB‑to‑serial adapter; manual PDF provides checksum verification steps.
• Mounting options: surface mount with 4‑mm screws, or optional bracket for wall or gate attachment.
• Operating temperature –20 °C to +60 °C; humidity 10–95 % RH (non‑condensing).
• Compliance: UL 325, CE, and FCC Class B for electromagnetic compatibility.
• Included accessories: mounting plate, 2‑way cable, and a 2‑year limited warranty with on‑site support.
• Dual‑language firmware, allowing English and Spanish prompts.
• 5‑minute “panic” mode that triggers all relays regardless of code input.
• Manual PDF provides step‑by‑step wiring diagrams, including a 3‑phase power option for high‑current applications.
• Firmware logs up to 10,000 entry attempts, stored in non‑volatile memory, and can be exported via the serial port.
• Compatible with Linear’s ACP series controllers, enabling integration into larger access control systems.
• LED indicators powered by a low‑power driver, consuming <0.5 W during operation.
• Built‑in tamper switch that triggers an audible alarm if the keypad is opened without proper authorization.
• Manual PDF includes a troubleshooting section covering common issues such as LED failure, code mismatch, and relay mis‑activation.
• Firmware supports time‑based access windows, allowing codes to be active only during specified hours.
• Designed for easy maintenance; the back panel can be removed with a Phillips screwdriver to replace the battery or reset the system.

Supported Code Capacity

The Linear AK‑11 keypad supports up to 480 unique user codes, each 1–6 digits long. Codes are stored in non‑volatile memory, ensuring persistence across power cycles. Each entry is verified against an internal table; a successful match triggers the assigned relay output. The device can assign codes to eight relay channels, allowing granular control of multiple doors or gates. Firmware supports temporary or one‑time codes that are automatically purged after use. Administrators program, modify, or delete codes via the serial interface or the on‑board LCD menu, with each change logged for audit. The manual PDF details memory allocation per code and the overhead for metadata. The 480‑code limit balances sufficient coverage with the device’s physical memory constraints. All entries are processed within milliseconds, maintaining a seamless user experience. The troubleshooting section covers common issues such as code duplication, failed entries, and memory corruption, providing step‑by‑step solutions. The documentation also explains how to back up and restore the entire code database, ensuring continuity during device replacement or system migration.

In addition, the keypad’s firmware allows for access windows, enabling codes to be active during hours. The system logs each successful and failed entry, which can be exported via the serial port for audit purposes. The device supports updates, ensuring that security patches can be applied without physical access.

Physical Build and Mounting Options

The Linear AK‑11 keypad is constructed from a durable cast‑aluminum shell that measures 4.5 in × 3.5 in × 0.75 in, providing a robust yet lightweight form factor. The enclosure is sealed to an IP65 rating, protecting against dust ingress and water jets from any direction, making it suitable for outdoor installations on gates, doors, and security panels. The device features a recessed keypad surface that accommodates a 12‑key matrix, each key rated for 20,000 actuations, ensuring long‑term reliability. Mounting is facilitated by four 1/4‑in. threaded holes located at the corners of the housing; 3‑in. M4 screws or 1/4‑in. machine screws can be used depending on the mounting surface; The keypad can be affixed to metal, wood, or concrete using standard mounting brackets or adhesive pads. For surface‑mount applications, a 1/4‑in. mounting plate with pre‑drilled holes is supplied, allowing quick installation on existing frames. The manual PDF provides detailed diagrams of the mounting options, including the recommended torque settings (0.8 in‑lb for M4 screws) and the use of rubber grommets to damp vibration. The keypad’s back panel includes a removable cover that exposes the internal circuitry for maintenance; a 10‑mm clearance is maintained for easy access. The device’s internal wiring is accessible through a 1‑inch wide panel opening, and the keypad’s design allows for a 180° rotation of the key matrix, enabling installation in tight spaces where the keypad must face the user at an angle. The enclosure’s corners are chamfered to reduce snagging on adjacent hardware, and the overall footprint is 4.5 in. × 3.5 in., making it compatible with standard security panels. The manual also notes that the device can be mounted on a 1/2‑in. thick plywood panel using four 1/4‑in. screws, with a 1/8‑in. spacer to maintain a flush surface. The combination of a rugged cast‑aluminum body, IP65 sealing, and versatile mounting options makes the Linear AK‑11 a reliable choice for a wide range of security applications.

LED Indicators and Status Lights

The Linear AK‑11 uses two front LEDs: a red LED that stays lit during normal operation, and a yellow LED that lights only while the keypad is in programming mode. When programming is finished, the yellow LED turns off automatically, leaving the red LED on to indicate readiness. An amber flash appears briefly if an entered code is invalid, giving instant visual feedback. The LEDs are powered from the 12‑V DC supply and are rated 2 W, ensuring visibility in bright outdoor settings. They are mounted within 1 in. of the keypad matrix to avoid obstruction. Replacement LEDs are standard 5 mm types (red PRC‑R, yellow PRC‑Y) with a forward voltage of 2.2 V and 20 mA current. A 330 Ω resistor provides moderate brightness; a 220 Ω resistor increases brightness at the cost of higher power. The firmware logs LED activity to the serial console for troubleshooting. This simple LED scheme gives users clear, intuitive status cues for both normal and programming modes.

The LEDs are powered by the same 12‑V DC supply that drives the keypad’s relay outputs. The firmware can be queried over the serial port to report the current LED status, which is useful for remote diagnostics; During installation, technicians should verify that the LEDs illuminate correctly after power is applied and that the yellow LED responds to the programming key sequence. If the LEDs fail to light, the user should check the 12‑V supply.

All LEDs are protected by a 0.5 Ω resistor, safety.

Use only Check.

Power Requirements and Connections

The Linear AK‑11 keypad operates on a 12‑V DC supply, with a maximum current draw of 300 mA. The device includes a built‑in 500 mA fuse for protection. Power is supplied via a 2‑pin terminal block or a 4‑wire cable: positive (+12 V) to pin 1, negative (ground) to pin 2. Optional relay outputs are driven by the same supply, each rated for 10 A at 120 V AC. Wiring should use 18 AWG copper for the power lines and 16 AWG for relay contacts. The keypad’s mounting bracket accepts a 5‑pin connector for remote start functions; pins 3 and 4 carry 24 V signals, pin 5 is a return. All connections must be secured with lock‑nuts to prevent vibration loosening. The manual recommends a 5 V DC to 12 V DC step‑down converter if the system is powered from a 5 V source. The device must be isolated from mains to avoid back‑feed; a diode bridge on the input protects the keypad. The firmware logs voltage spikes to the serial port for diagnostics. During installation, verify the polarity with a multimeter before connecting. The keypad’s LED indicators draw 30 mA total; the relay coil current is measured during programming. Ensure the power supply’s ripple is below 10 % to maintain stable operation. The manual also specifies that the device should be installed within 10 ft of the power source to reduce voltage drop. Finally, the keypad’s enclosure is rated IP65, protecting against dust and water jets, so the power cable should be routed through a weather‑sealed conduit!!!

Installation Guide

Disconnect power before mounting. Secure the keypad on a dry surface with screws. Connect the 12 V DC supply to the terminal block, ensuring correct polarity. Wire relay outputs to the door controller. Verify LED status, then seal the enclosure. and test the relay.OK

Pre-Installation Safety Precautions

Before installing the Linear AK‑11 keypad, ensure the power supply is disconnected and the area is free of moisture. Verify that the voltage rating matches the device’s 12 V DC input specification. Use insulated tools and wear anti‑static wrist straps to prevent electrostatic discharge. Check that the mounting surface is clean, dry, and level; any debris can compromise the seal and lead to corrosion. Mark the mounting holes with a permanent marker and drill pilot holes using a drill bit slightly smaller than the screws. Apply a thin layer of silicone sealant around the mounting flange to create a weather‑proof barrier. When connecting the power leads, double‑check polarity: the red wire should connect to the positive terminal, and the black wire to the negative. Secure the wires with heat‑shrink tubing or electrical tape to avoid accidental short circuits. Route the relay output leads away from high‑temperature components and ensure they are insulated. After assembly, perform a continuity test on all connections using a multimeter set to the resistance mode. Once verified, reconnect power and observe the status LEDs; the green LED should illuminate, indicating proper operation. Finally, test the keypad by entering a known code and confirm that the relay activates the door or gate mechanism. Document the installation steps in a maintenance log for future reference. Keep the manual in a waterproof folder for quick access during maintenance.

The Linear AK‑11 keypad is a cast‑aluminum, surface‑mount device offering 480 programmable codes, each 1–6 digits. It features dual LEDs for status, a relay output for door or gate control, and a 12‑V DC power input. The manual PDF details mounting, wiring, and programming steps. Secure entry. The keypad’s mounting flange is engineered to accommodate a 4‑40 x 1‑inch screw with a 1/16‑inch washer. For high‑traffic installations, a metal mounting bracket can be used to distribute load. After securing the keypad, route the power cable through a weather‑proof cable gland; this prevents water ingress and protects the cable from abrasion. The cable should be positioned so that it does not interfere with the gate’s mechanical components. Use a cable clamp to secure the cable near the keypad, and ensure the cable length allows for a 12‑V DC adapter to be placed within 2 ft of the device. The keypad’s IP65 rating guarantees protection against dust and jets of water, but a silicone gasket around the mounting flange further enhances sealing. Finally, perform a visual inspection to confirm that the keypad is flush, the screws are torqued to 0.5 in‑lb, and the cable gland is sealed. Document the mounting location and any custom modifications in the installation log for future maintenance.

Mount the keypad on a clean, flat surface. Use 4‑40 screws and a rubber washer. Apply silicone sealant around the flange. Route power cable through a cable gland, secure with a clamp. Verify LEDs and test a code. Done.

Wiring and Power Setup

Connect the Linear AK‑11 keypad to a 12‑V DC power source using the supplied terminal block. The device needs a minimum of 0.5 A; a 12‑V, 1‑A adapter is recommended. Wire the positive (+) line to the “+12V” terminal and the negative (−) line to the “GND” terminal. Use 18‑AWG insulated copper wire for all connections. The keypad’s relay output is on terminals “R1” and “R2”; connect these to a 12‑V, 0.5‑A relay coil that drives the gate or door actuator. Ensure the relay coil is rated for the load and that the coil wires are insulated and routed away from the keypad’s power leads to avoid interference. A common ground must be shared between the keypad, relay, and actuator to keep signal integrity. For outdoor use, place the wiring in a weather‑proof junction box and seal all cable entries with silicone. Verify polarity before energizing the circuit. After wiring, use a multimeter to confirm 12 V across the power terminals and test the relay contacts. Once verified, secure all wiring with zip ties and label each cable for future maintenance. Finally, power the keypad and observe the status LEDs: the green LED should illuminate, indicating proper power delivery, while the red LED remains off unless an error occurs. This completes the wiring and power setup for the Linear AK‑11 keypad. All wiring should be neatly bundled and secured to prevent accidental disconnection. After installation, perform a full functional test by entering a known code and verifying the relay action. All good!!

Testing Initial Functionality

After completing the wiring and power setup, perform a systematic test to confirm the Linear AK‑11 keypad operates correctly. The green LED should illuminate immediately, indicating 12 V power. Enter a known user code that has been programmed. The keypad will display the entered digits; upon pressing “Enter,” a brief click occurs and the green LED flashes once to confirm entry. If the code is correct, the relay output (R1/R2) energizes, closing contacts and triggering the connected door or gate actuator. Verify by checking the relay coil voltage with a multimeter or observing the actuator’s movement. If the code is incorrect, the red LED flashes twice and the green LED remains steady. Repeat with at least three different codes, including an intentionally incorrect one, to ensure appropriate responses. Finally, test the keypad’s response to a power cycle: disconnect power for a few seconds, then reconnect. The keypad should reboot, the green LED should flash during startup, and the device should return to its idle state, ready to accept new code entries. Document all observations and note any anomalies for troubleshooting. Once all tests pass, the keypad is ready for normal operation in the security system. All good!!

During testing, also verify key debounce by rapidly pressing multiple keys; the keypad should register each press without duplication. Confirm memory retention after a power outage by rebooting and re-entering a known code. The relay should maintain its configured state until a new code is entered or the keypad is reset. All good!!!.

Programming Instructions

Enter programming mode by holding * and # until the green LED blinks. Input the master code, then type the new user code (1–6 digits). Press * for relay 1–4. The green LED flashes once to confirm. Delete codes by entering code and pressing #. All good Confirm!

Entering Programming Mode

To access the configuration interface of the Linear AK‑11 keypad, first ensure the device is powered and all LEDs are off. Press and hold the * and # keys simultaneously for at least three seconds. The green status LED will begin to flash rapidly, indicating that the keypad has entered programming mode. At this point, the keypad is ready to receive the master code, which is required for all subsequent configuration tasks. After entering the master code, the green LED will pause briefly before resuming its rapid blink, confirming that the code was accepted. If the LED remains solid or turns red, the entered master code is incorrect; repeat the process until the correct code is accepted. Once in programming mode, the keypad will remain in this state until the user exits by pressing the Esc key or by cycling power. During this period, the keypad accepts commands for adding, deleting, and modifying user codes, as well as setting relay outputs. It is essential to follow the sequence of key presses exactly as specified in the manual to avoid corrupting the keypad’s memory. For detailed command sequences, refer to the official Linear AK‑11 manual PDF available on the manufacturer’s website or through authorized distributors. Proper use of the programming mode ensures secure and reliable operation of the keypad in access control applications.

When the keypad first powers on, the yellow LED lights for a short duration to signal readiness. If the device is in a locked state, the red LED will illuminate until the correct master code is entered. The programming mode can also be entered by using the Enter key in combination with the 0 key, but this method is less common and is only supported on firmware versions 1.2 and later. The manual PDF specifies that the maximum time allowed for entering the master code is 30 seconds; exceeding this will automatically exit programming mode and reset the LED state. Users should avoid touching the keypad surface during this process to prevent accidental key presses that could corrupt the code database. After successful entry, the keypad will display a brief confirmation message on its internal display before returning to normal operation.

Adding and Deleting User Codes

After entering programming mode, the keypad accepts user code changes via its numeric keypad. To add a code, press +, type the 1‑to‑6 digit code, and press Enter; a double green LED flash confirms success. If the code already exists, the keypad beeps and the LED stays solid. To delete a code, press -, enter the target code, and press Enter; a single green flash indicates removal. If the code is absent, the keypad emits a long beep and the red LED blinks. The AK‑11 stores up to 480 unique codes; exceeding this limit triggers an error message on the internal display. All changes are written to non‑volatile memory immediately, so power cycling does not erase data. For bulk updates, the manual PDF describes a CSV import feature: format a FAT32 USB drive with a file named codes.csv containing one code per line, insert the drive, press Import, and the keypad processes each entry, reporting any errors in a pop‑up. The keypad also allows individual code locking via the Lock key, which disables the code until unlocked again. These functions give administrators granular control over access permissions.

Configuring Relay Outputs

Once in programming mode, the AK‑11 keypad’s relay configuration is accessed by pressing the R key. The display will prompt “Relay 1‑8: ON/OFF”. Each relay corresponds to a separate output channel, allowing the keypad to trigger up to eight independent devices, such as door locks, alarms, or lights. To enable a relay, type the relay number (1–8), press Enter, then type 1 for ON or 0 for OFF, and press Enter again. A green LED flash confirms the change; a red LED flash indicates an invalid entry. The keypad stores the relay state in non‑volatile memory, so power loss does not reset the configuration; For advanced users, the manual PDF describes a “batch mode” where multiple relays can be set in a single command: type B, followed by a comma‑separated list of relay numbers and their desired states (e.g., “1:1,3:0,5:1”). After confirming, the keypad processes each command and displays a summary. The relay outputs are 12‑V DC, 1 A, and can be wired directly to a relay module or a contact closure. The manual also warns that the relay contacts should not exceed 10 A to avoid overheating. Finally, the keypad’s status LEDs provide visual feedback: a steady green LED indicates that the keypad is powered and ready, while a blinking green LED during relay configuration signals that the keypad is in programming mode. Once all desired relays are set, press Save to commit the settings and exit programming mode. The keypad’s firmware also supports time‑based access schedules, allowing certain codes to be active only during specified hours, which can be configured via the same programming interface. Additionally, the keypad’s firmware logs each activation attempt, storing timestamps and the code used, which can be reviewed through the serial interface for audit purposes. For installations requiring higher security, the device can be paired with a secondary authentication module, enabling multi‑factor verification before relay activation.

Saving and Verifying Settings

After completing all code entries and relay configurations, the Linear AK‑11 keypad must commit changes to its internal flash memory. Press the Save key while the display shows “SAVE?”; a green LED will pulse twice to confirm readiness. The keypad then displays “SAVING…” for 3–5 seconds, during which the power line should remain uninterrupted. Once the write cycle finishes, a steady green LED and the message “OK” confirm that the configuration has been stored successfully. If a red LED flashes or the screen shows “ERROR”, the write failed—commonly due to a sudden power loss or corrupted memory sector. In that case, repeat the save sequence or perform a full power cycle (disconnect and reconnect the 12‑V supply) to clear transient faults. Verification is built into the save process, but the manual PDF recommends a manual check for mission‑critical installations. Exit programming mode, then enter a recently added code. The keypad should activate the linked relay(s) and the status LED should toggle in accordance with the relay state. For a deeper audit, connect a USB‑to‑serial adapter to the keypad’s UART port and use terminal software to read the internal log. The log records timestamps, code numbers, and relay states for each activation, which is invaluable for security audits or troubleshooting after firmware updates. The manual also advises maintaining a written record of the final configuration, noting the date, operator.