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📘 DoorProtect Plus User Manual

DoorProtect Plus is a wireless security device which detects opening, shocks, and tilting. It has a socket for connecting an external detector. DoorProtect Plus is connected to the Ajax security system via the protected Jeweller protocol, with an effective communication range of up to 1,200 meters without obstacles. Can operate up to 5 years from a pre-installed battery and is furnished with a sealed contact reed relay processing more than one million openings. It has a socket for connecting an external detector.

Sealed contact reed relay is a device which forms a continuous circuit under the effect of a constant magnet. It consists of ferromagnetic contacts placed in a bulb.

Not compatible with the Ajax uartBridge or Ajax ocBridge Plus

The detector is set up via a mobile application for iOS and Android-based smartphones. The user is notified of all events through push notifications, SMS messages and calls (if activated).

The Ajax security system is self-sustaining, but the user can connect it to the central monitoring station of a private security company.

👉 Buy opening detector with shock and tilt sensor DoorProtect Plus

Functional Elements

  1. DoorProtect Plus
  2. Big magnet
  3. Small magnet
  4. Light indicator
  5. SmartBracket attachment panel (perforated part is required for actuating the tamper 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

DoorProtect Plus Operating Principle

DoorProtect Plus consists of two parts: the detector itself with a sealed contact reed relay, and a constant magnet. The detector is equipped with two magnets - small and big, with the magnet operation ranges of 1 cm and 2 cm accordingly. The detector is attached to a moving wing or sliding part and the magnet - to a frame. If the sealed contact reed relay is within the coverage area of the magnetic field, it closes the circuit - the detector is closed. The opening of the wing distances the magnet from the sealed contact reed relay, resulting in the circuit opening, and the detector records opening.

The detector may be positioned horizontally.

If there is no need to detect opening with the sealed contact reed relay, please use only an electronics unit (without magnets) and disable the magnetic sensor in the settings.

Tilt detector detects the vertical deviation of the device 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 in the airing mode (you should рreviously disable the magnetic sensor in the settings).

After actuation, the DoorProtect Plus detector set in the intrusion detection mode immediately transmits an alarm signal to the Ajax Hub, activating the sirens connected to the hub and notifying the user and private security company.

Detector Connection to hub

Before starting connection:

  • Following the Hub instruction recommendations, install the Ajax application on your smartphone. Create an account, add the Hub to the application, and create at least one room.
  • Go to the Ajax application.
  • Switch on the Hub and check the internet connection (via Ethernet cable and/or GSM network).
  • Ensure that the Hub is disarmed and does not start updates by checking its status in the mobile application.

⚠️ Only users with administrative privileges can add the device to the hub.

How to connect the detector to the Hub:

  1. Select the Add Device option in the Ajax application.
  2. Name the device, scan/write manually the QR Code (located on the body and packaging), and select the location room.

  3. Select Add — the countdown will begin.

  4. Switch on the device

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

If connection to the Ajax Hub failed (LED blinks once per second), switch off the detector for 5 seconds and repeat the attempt.

The detector connected to the hub will appear in the list of devices of the hub in the application. Update of the detector statuses in the list depends on the device inquiry time set in the hub settings, with the default value - 36 seconds.


Devices → DoorProtect Plus 


Temperature of the Detector. This is measured on the processor and changes gradually
Signal Strength
Signal strength between the Hub and the detector
Battery Charge
Battery level of the detector, displayed in increments of 25%
The tamper mode of the detector, which reacts to the detachment of or damage to the body
Delay when entering, sec
Delay time when entering
Delay when leaving, sec
Delay time when exiting
Connection status between the hub and the detector
Primary Detector
Primary detector status
Secondary detector
Status of the external detector connected to DoorProtect Plus
Always active
If active, the detector is always in the armed mode
Shock sensor
If active, DoorProtect Plus will detect the shock
Tilt sensor
If active, DoorProtect Plus will detect tilt angle changing
Detector firmware version
Device ID
Device identifier

Setting Up the Detector

Devices → DoorProtect Plus → Settings [⚙️]


First field
Detector name, can be edited
Selecting the virtual room to which the device is assigned
Arm in night mode
If active, the detector will switch to armed mode when using night mode
Primary Detector
If active, the DoorProtect Plus primary detector reacts to opening/closing
External contact enabled
If active, the detector registers external detector alarms
Shock sensor
If active, shock-sensor will detect alarm after more than one impact
Sensitivity level of the shock sensor
Ignore simple impact
If active, single impact will be ignored
Tilt sensor
If active, sensor will detect tilt
Selecting the normal angle of the sensor. Above this limit, the sensor detects an alarm
Tilt alarm delay
Selecting the tilt alarm delay
Always active
If active, the detector always registers opening/closing
Delay when entering, sec
Selecting delay time when entering
Delay when leaving, sec
Selecting delay time on exit
Delays in night mode
Delay turned on when using night mode
Alert with a siren if opening detected
If active, HomeSiren and StreetSiren are activated when opening detected
Alert with a siren if an external contact is open
If active, HomeSiren and StreetSiren are activated during an external detector alarm
Alert with a siren if shock detected
If active, HomeSiren and StreetSiren are activated during a shock alarm
Alert with a siren if tilt detected
If active, HomeSiren and StreetSiren are activated during a tilt alarm
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)
User Guide
Opens the detector User Guide
Unpair Device
Disconnects the detector from the Hub and deletes its settings


Turning 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 paragraph

Performance testing

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

The tests do not start straight away but within a period of 36 seconds when using the standard settings. The test time start depends on the settings of the detector scanning period (the paragraph on “Jeweller” settings in Hub settings).

Selection of the Detector Location

Location of the DoorProtect Plus detector determines its remoteness from the hub and presence of any obstacles between the devices hindering the radio signal transmission: walls, interfloor bridgings, large-size objects located within the room.

Check the signal strength at the installation site

If the signal strength reaches just one bar on the indicator, the stable operation of the security system can not be guaranteed. Take whatever action is necessary to improve the quality of the signal! At the very least, move the device — relocation even by 20 cm can significantly improve the reception quality.

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

Do not install the detector:

  • outside the room (outdoors)
  • nearby any metal objects or mirrors causing attenuation and screening of the signal
  • within any premises with the temperature and humidity beyond the range of permissible limits

The magnet is attached to the right of the detector. The detector is located either inside or outside the door case (window frame):

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 - 2 cm.

Detector Testing

Having defined the location, fix the detector and magnet with a double-sided adhesive tape and check the operation of the device using the detection zone test:

While in the test mode, the DoorProtect light indicator lights continuously, however switching off for a second, if the detector is actuated. Check correct operation of the device by opening/closing the wing several times.

Connecting a Wire Detector

A wire detector with an NC type contact may be connected to the DoorProtect Plus using an outside-mounted terminal clamp. 

We recommend to install the wire detector at a distance not exceeding 1 meter - increasing the wire length will increase the risk of its damage and reduce the quality of communication between the detectors.

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

If the external detector is actuated, you will receive the respective notice.

Installation of the Detector

Before installing the detector, make sure that you have selected the optimal location and it is in compliance with the guidelines contained in this manual!

  1. Fix the SmartBracket attachment panels of the detector and magnet using bundled screws. If using any other attachment hardware, make sure that they do not damage or deform the panel.
    The double-sided adhesive tape may be only used for temporary attachment of the detector and magnet. The tape will run dry in course of time, which may result in falling of DoorProtect Plus and actuation of the security system. Furthermore, the device may fail from a hit.
  2. Put the detector on the attachment panel. As soon as the detector is fixed in SmartBracket, it will blink with a LED - this will be a signal that the tamper on the detector is closed. If the light indicator of the detector is not actuated after installation in SmartBracket, check the status of the tamper in the Ajax Security System application and then the fixing tightness of the panel.
    If the detector is torn off from the surface or removed from the attachment panel, you will receive the notification.
  3. Put the magnet on the attachment panel.

Detector Maintenance and Battery Replacement

Check the operational capability of the DoorProtect Plus detector on a regular basis.

Clean the detector body from dust, spider web and other contaminations as they appear. Use soft dry napkin suitable for equipment maintenance.

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

The service life of the detector from the battery depends on battery quality, the actuation frequency of the detector and inquiry interval of the detectors by the hub.

If the door opens 10 times a day and the detector inquiry interval is set at 60 seconds, then DoorProtect will operate 5 years from the pre-installed battery. You will reduce the service life of the device to 2 years by setting the inquiry interval at 12 seconds.

If the detector battery is discharged, the user will receive a notice, and the LED will smoothly light up and go down if the detector or tamper is actuated.

👉🏻 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
Tamper protection
Frequency band
868.0 – 868.6 MHz or 868.7 – 869.2 MHz depending on the region of sale
Maximum RF output power
Up to 20 mW
Modulation of the radio signal
Radio signal range
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
Operating temperature range
From -10°С to +40°С
Operating humidity
Up to 75%
Ø 20 х 90 mm
29 g

Complete Set

  1. DoorProtect Plus
  2. Battery CR123A (pre-installed)
  3. Big magnet
  4. Small magnet
  5. Outside-mounted terminal clamp
  6. Installation kit
  7. 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!

👉🏻The full text of the warranty

👉🏻User Agreement

Technical support:

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