DoorProtect Plus User Manual


DoorProtect Plus is a wireless opening, shock, and tilt detector, that operates within the Ajax security system, connecting via the protected Jeweller radio protocol. Is used inside premises. The communication range is up to 1,200 m line of sight. DoorProtect Plus can operate up to 5 years from a pre-installed battery and capable to detect more than one million openings.

The user can configure the detector via the Ajax app for iOS, macOS, Windows, or Android. The app notifies the user of all events through push notifications, SMS, and calls (if activated).

DoorProtect Plus does not support connecting via the Ajax uartBridge or Ajax ocBridge Plus integration modules.

The Ajax security system can be connected to a central monitoring station of a security company.

Functional Elements

ajax doorprotect plus
  1. DoorProtect Plus
  2. Big magnet (should be placed to the right of the detector)
  3. Small magnet (should be placed to the right of the detector)
  4. LED indicator
  5. SmartBracket attachment panel (perforated part triggers the tamper button in case of any attempt to tear off the detector from the surface)
  6. External detector connection socket
  7. QR code
  8. Device switch
  9. Tamper button

Operating Principle

DoorProtect Plus consists of two parts: the detector and the constant magnet. The detector is equipped with the sealed contact reed relay, built-in accelerometer, and socket for a third-party wired detector.

Attach the detector to the door frame, while the magnet can be attached to the moving wing or sliding part of the door. If the sealed contact reed relay is within the coverage area of the magnetic field, it closes the circuit, which means that the detector is closed. The opening of the door pushes out the magnet from the sealed contact reed relay and opens the circuit. In such a way, the detector recognizes the opening.

The DoorProtect Plus set includes two constant magnets. The small one works at a distance of 1 cm, and the big one — up to 2 cm.

The detector can be positioned horizontally. If there is no need to detect opening, use only the detector part (without magnets) and disable the primary detector in the settings.

The accelerometer detects shocks and vertical deviation relative to the initial position of more than 5°. DoorProtect Plus can be installed on windows, including dormer windows, and the system can be armed when they are slightly open (disable the primary detector in the settings рreviously).ajax doorprotect plus

Attach the magnet to the RIGHT of the detector.

If triggered, DoorProtect Plus immediately transmits the alarm signal to the hub, activating the sirens and notifying the user and security company.


Before starting connection

  1. Following the hub user guide, install the Ajax app. Create the account, add the hub, and create at least one room.
  2. Switch on the hub and check the internet connection (via Ethernet cable and/or GSM network).
  3. Make sure that the hub is disarmed and does not update by checking its status in the Ajax app.

Only users with administrator rights can add the device to the hub.

How to connect the detector to the hub

  1. Select Add Device in the Ajax app.
  2. Name the device, scan or type the QR code (located on the detector body and packaging), and select the location room.
    ajax doorprotect plus
  3. Tap Add — the countdown will start.
  4. Switch on the device.
    ajax doorprotect plus

For detection and pairing to occur, the detector should be located within the coverage area of the wireless network of the hub (at a single protected object). The connection request is transmitted for a short time: at the moment of switching on the device.

If the device failed to pair (LED blinks once per second), switch it off for 5 seconds and retry. The detector connected to the hub appears in the list of devices in the app. The update of the detector statuses in the list depends on the device ping interval set in the hub settings (the default value is 36 seconds).


  1. Devices
  2. DoorProtect Plus
Parameter Value
Temperature The temperature of the detector. The temperature is measured on the processor and changes gradually
Jeweller Signal Strength The signal strength between the hub and the detector
Battery Charge

Battery level of the device. Displayed as a percentage

How battery charge is displayed in Ajax apps

Lid The tamper mode of the detector, which reacts to the detachment of or damage of the body
Delay When Entering, sec

Entry delay (alarm activation delay) is the time you have to disarm the security system after entering the room

What is delay when entering

Delay When Leaving, sec

Delay time when exiting. Delay when exiting (alarm activation delay) is the time you have to exit the room after arming the security system

What is delay when leaving

ReX Displays the status of using the radio signal range extender ReX
Connection Connection status between the hub and the detector
Primary Detector Indicates whether the opening sensor is active
External Contact Status of the external detector connected to DoorProtect Plus
Always Active Indicates whether the detector is always armed
Shock Sensor Indicates whether the shock sensor is active
Tilt Sensor Indicates whether the tilt sensor is active
Temporary Deactivation Shows the status of the device temporary deactivation function:

  • No — the device operates normally and transmits all events.
  • Lid only — the hub administrator has disabled notifications about triggering on the device body.
  • Entirely — the device is completely excluded from the system operation by the hub administrator. The device does not follow system commands and does not report alarms or other events.
  • By number of alarms — the device is automatically disabled by the system when the number of alarms is exceeded (specified in the settings for Devices Auto Deactivation). The feature is configured in the Ajax PRO app.
  • By timer — the device is automatically disabled by the system when the recovery timer expires (specified in the settings for Devices Auto Deactivation). The feature is configured in the Ajax PRO app.
Firmware The detector firmware version
Device ID Device identifier


  1. Devices
  2. DoorProtect Plus
  3. Settings
Setting Value
First field Detector name, can be edited
Room Selecting the virtual room to which the device is assigned
Delay When Entering, sec

Selecting delay time when entering. Delay when entering (alarm activation delay) is the time you have to disarm the security system after entering the room

What is delay when entering

Delay When Leaving, sec

Selecting the delay time when exiting. Delay when exiting (alarm activation delay) is the time you have to exit the room after arming the security system

What is delay when leaving

Delays in Night Mode

Delay turned on when using Night mode

What is night mode

Arm in Night Mode

If actived, the detector switches to armed state while Night mode is active.

Kept in mind that in Night mode, all active sensor of the detector become armed. It is not possible to arm only certain sensors of the detector in Night mode (for example, only a tilt sensor)

Alarm LED indication

Allows you to disable the flashing of the LED indicator during an alarm. Available for devices with firmware version or higher

How to find the firmware version or the ID of the detector or device?

Primary Detector If setting is active, the DoorProtect Plus primary detector reacts to opening/closing
External Contact If setting is active, the detector registers external detector alarms
Shock Sensor If active, shock-sensor will detect alarm after more than one impact
Sensitivity Sensitivity level of the shock sensor
Ignore Simple Impact If active, the detector ignores single hit
Tilt Sensor If active, sensor will detect tilt
Tilt Selecting the normal angle of the sensor. Above this limit, the sensor detects an alarm
Tilt Alarm Delay The number of seconds from the moment the sensor is tilted to the alarm
Always Active When turned on, the detector is always armed
External Contact Enabled Selecting the type of external wired detector
Time before alarm, sec
(available for roller shutter motion detector only)
The time in seconds during which a given number of impulses should be counted. This time is counted after the first impulse of the detector.
Impulses before alarm
(available for roller shutter motion detector only)
Number of detector impulses required to raise an alarm
Alert with a siren if opening detected If active, sirens added to the system are activated when opening detected
Alert with a siren if an external contact is opened If active, sirens added to the system are activated during an external detector alarm
Alert with a siren if shock detected If active, sirens added to the system are activated during a shock alarm
Alert with a siren if tilt detected If active, sirens added to the system are activated during a tilt alarm
Jeweller Signal Strength Test Switches the detector to the signal strength test mode
Detection Zone Test Switches the detector to the detection area test
Attenuation Test Switches the detector to the signal fade test mode (available in detectors with firmware version 3.50 and later)
Temporary Deactivation

Allows the user to disconnect the device without removing it from the system.

Two options are available:

  • Entirely — the device will not execute system commands or participate in automation scenarios, and the system will ignore device alarms and other notifications
  • Lid only — the system will ignore only notifications about the triggering of the device tamper button

Learn more about temporary deactivation of devices

The system can also automatically deactivate devices when the set number of alarms is exceeded or when the recovery timer expires.

Learn more about auto deactivation of devices

User Guide Opens the detector User Guide
Unpair Device Disconnects the detector from the hub and deletes its settings


Event Indication Note
Switching on the detector Lights up green for about one second
Detector connection to the hub Lights up continuously for a few seconds
Alarm / tamper activation Lights up green for about one second Alarm is sent once in 5 seconds
Battery needs replacing During the alarm, it slowly lights up green and slowly goes out Replacement of the detector battery is described in the Battery Replacement manual

Performance testing

The Ajax security system allows conducting tests for checking the functionality of connected devices.

The tests do not start immediately but within 36 seconds by default. The starting time depends on the ping interval (the paragraph on “Jeweller” settings in hub settings).

Jeweller Signal Strength Test

Detection Area Test

Attenuation Test

Installing the Detector

The location of DoorProtect Plus depends on its remoteness from the hub, and obstacles hindering the radio signal transmission: walls, floors, large objects inside the room.

The device developed only for indoor use.

Check the Jeweller signal level at the installation location

If the signal level is low (one bar), we cannot guarantee the stable operation of the detector. Take all possible measures to improve the quality of the signal. At least, move the detector: even a 20 cm shift can significantly improve the quality of signal reception.

If the detector has low or unstable signal strength even after moving, use a ReX radio signal range extender.

Do not install the detector:

  1. outside the premises (outdoors);
  2. nearby any metal objects or mirrors causing attenuation or screening of the signal;
  3. at any places with fast air circulation (air fans, open windows or doors);
  4. inside premises with the temperature and humidity beyond the range of permissible limits;
  5. closer than 1 m to the hub.

Attach the magnet to the right of the detector. The side to which the magnet should be attached is marked with an arrow on the detector’s body. The detector is located either inside or outside the door case (window frame).

ajax doorprotect plus

When installing the detector in the perpendicular planes (inside the case/frame), use the small magnet from the set. The distance between the magnet and detector should not exceed 1 cm.

When positioning the parts of DoorProtect Plus in the same plane, use the big magnet. Its actuation threshold is 2 cm.

Detector Testing

Having defined the location, fix the detector and magnet with the double-sided adhesive tape and check its operation of using the Detection Zone test.

In the test mode, the DoorProtect Plus LED lights continuously, switching off for a second, if the detector is triggered. Check the correct operation of the device by opening/closing the door several times.

Connecting a Third-Party Wired Detector

A wired detector with an NC (normally closed) contact type can be connected to DoorProtect Plus using the in-built terminal clamp.

ajax doorprotect plus

We recommend installing the wired detector at a distance no longer than 1 meter to DoorProtect Plus. Longer wire length increases the risk of its damage and reduces the quality of communication between the detectors.

To put out the wire from the detector body, break out the plug:

ajax doorprotect plus

If the connected wired detector is triggered, you receive the notification.

To make sure the alarm is raised when the roller shutter is opened, connect the wired roller shutter motion detector with the NC (normally closed) contact to DoorProtect Plus. The function is available for the devices with firmware version and higher.

How to find the firmware version or the ID of the sensor or device?

How to connect the roller shutter motion detector to DoorProtect Plus


Before installing the detector, make sure that you have selected the optimal location that follows the guidelines of this manual!

  1. Fix the SmartBracket attachment panel using bundled screws. If you use any other attachment tools, make sure that they do not damage or deform the attachment panel.

    Use double-side adhesive tape only for temporary attachment of the detector. The tape runs dry with time, which can cause falling, false triggering, and detector malfunction.

  2. Put the detector on the attachment panel. When the detector is fixed in SmartBracket, it blinks with LED, signaling that the tamper is closed. If LED doesn’t blink after fixing in SmartBracket, check the status of the tamper in the Ajax app and then the fixing tightness of the panel.

    If someone detaches the detector from the surface or takes it off the attachment panel, the security system notifies you.

  3. Put the magnet on the attachment panel.


Check the operational capability of the detector regularly. Clean the detector body from dust, spider web, and other contaminants as they appear. Use soft dry napkin suitable for tech equipment.

Do not use any substances containing alcohol, acetone, gasoline, and other active solvents to clean the detector.

The battery life depends on its quality, detector triggering frequency, and ping interval by the hub.

If the door opens 10 times a day and the detector ping interval is 60 seconds, then DoorProtect Plus operates 7 years from the pre-installed battery. For instance, a 12-seconds ping interval reduces the battery life to 2 years.

How long Ajax devices operate on batteries, and what affects this

If the detector battery is low, the system notifies the user, and the LED indicator smoothly lights up and goes off if a glass break is detected or the tamper is triggered.

Battery Replacement

Tech specs

Detector actuation threshold

1 cm (small magnet)

2 cm (big magnet)

Tilt sensor activation threshold 5° or more (customizable)
Shock sensitivity 3 levels
Ignore first shock option Yes
Tamper protection Yes
Frequency band 868.0 – 868.6 MHz or 868.7 – 869.2 MHz depending on the region of sale
Compatibility Operates only with all Ajax hubs, and range extenders
Maximum RF output power Up to 20 mW
Modulation of the radio signal GFSK
Radio signal range Up to 1,200 m (any obstacles absent)
Socket for connecting wire detectors Yes, NC
Power supply 1 battery CR123A, 3 V
Battery life Up to 5 years
Installation method Indoors
Protection class IP50
Operating temperature range From -10°С to +40°С
Operating humidity Up to 75%
Dimensions Ø 20 × 90 mm
Weight 29 g
Service life 10 years
Certification Security Grade 2, Environmental Class II in conformity with the requirements of EN 50131-1, EN 50131-2-6, CLC/TS-50131-2-8, EN 50131-5-3

Compliance with standards

Complete Set

  1. DoorProtect Plus
  2. SmartBracket mounting panel
  3. Battery CR123A (pre-installed)
  4. Big magnet
  5. Small magnet
  6. Outside-mounted terminal clamp
  7. Installation kit
  8. Quick Start Guide


Warranty for the “AJAX SYSTEMS MANUFACTURING” LIMITED LIABILITY COMPANY products is valid for 2 years after the purchase and does not apply to the pre-installed battery.

If the device does not work correctly, you should first contact the support service—in half of the cases, technical issues can be solved remotely!

Technical support: [email protected]

Need help?

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