How to connect a wire detector to Ajax and Transmitter capabilities

How to connect a wire detector to Ajax and Transmitter capabilities

The Ajax security system includes motion detectors,  glass break detector, opening, impact and tilt detectors, smoke detectors, temperature and CO detectors, flooding detector. It is sufficient for most premises protection scenarios from burglary, fire, and flooding. And when it is necessary to ensure the outdoor security or to use the detector beyond Ajax model range, the Transmitter integration module will come in handy.


Ajax Transmitter is a wireless module for connecting external devices with wire outputs to the Ajax security system. The module has an alarm and tamper inputs (NC and NO contacts are supported), there is a 3.3 V power supply for the external detector.

The following may be connected to the Ajax security system, using the Transmitter:

  • motion detector
  • gas detector
  • shutter detector
  • perimeter detector
  • leakage detector
  • glass break detector
  • temperature detector
  • vibration detector
  • wire reed switch
  • alarm button
  • tamper

And also any other detector and devices with NC/NO terminals.

Transmitter characteristics

  • It turns external detectors into proper Ajax devices.
  • It can be placed in a detector body.
  • It can be installed both indoors and outdoors (in the body of an outdoor-type detector or in a sealed compartment).
  • It can be used as a power supply for the connected device (3.3 V power supply).
  • It is equipped with an accelerometer, which raises an alarm if the module is moved.
  • It operates at +50°С to −25°С and up to 90 % humidity without condensation.

The Transmitter only operates with Ajax Hub. The device does not operate with Ajax ocBridge Plus or Ajax uartBridge!

Connecting the detector to the Transmitter

Terminals functions


  • Power supply is a 3.3 V power supply output for an external detector.
  • Alarm means alarm terminals, to which NC/NO zones of an external detector is connected.
  • Tamper refers to tamper zones, to which tamper outputs of an external detector is connected.

How to connect the Transmitter to Ajax Hub

1. Click “Add Device” in the Ajax mobile application:

2. Name the device, scan QR or enter the code manually (located on the body and package), and select the room. After you click “Add”, it will begin counting down:

Ajax Mobile App

3. Turn on the Transmitter using the button on the body:


Transmitter module settings and statuses

The Transmitter and the external wire detector statuses can be viewed at any time in the mobile application by selecting the Transmitter in the device list.

Devices → Transmitter

Ajax Mobile App

Parameter Status
Device processor temperature
Signal Strength
The signal level between the device and the Ajax Hub
Battery charge
The Transmitter battery charge level
Tamper zone status
The connection between Ajax Hub and Transmitter
Always Active
When turned on, the sensor is always in an armed mode
Alert if moved
It turns on the Transmitter accelerometer, detecting device movement


Devices → Transmitter → “Gear”

Ajax Mobile App

Selection of the room where the device is located.

Contact status of the external sensor
Selection of the external detector normal status:

  • Normally closed (NC)
  • Normally opened (NO)

Type of the external sensor
Selection of the external detector type:

  • Pulsed
  • Bistable

Tamper mode
Selection of the normal tamper mod for an external detector:

  • Normally closed (NC)
  • Normally opened (NO)

Always active
When the mode is active, the Transmitter transmits alarms even when the system is not armed.

Alert if moved
The accelerometer turning on the Transmitter to provide an alarm in the event of sensor movement.

Power supply of the external detector
Turning the power on in 3.3 V external detector:

  • Disabled if Hub is armed. The module saves battery power by turning off the power of the external detector and does not process any signals from the ALARM terminal the system is disarmed. When the system is armed, the power supply restarts and the sensor alarms are ignored for the first 8 seconds to avoid false responses when the device is being turned on.
  • Always disabled. The Transmitter does not consume energy to power the external detector. The ALARM terminal signals are processed both in pulsed and bistable modes.
  • Always active. This should be used, if there is a problem in a powering mode of the external detector “Turned off if the Ajax Hub is not armed”. The mode can significantly shorten the battery life of the Transmitter. The ALARM terminal signals when the security system is armed in pulsed mode are processed at most once in three minutes; in bistable mode, they are always processed. The application always displays the correct information in the Sensor Status line in bistable mode (regardless of the armed mode status).

Partial arming mode
When turned on, the detector connected to the Transmitter will be arming when the partial armed mode is turned on.

Activate the siren if an alarm is detected
Whether the siren is turned on during the Transmitter alarm.

The scheme for connection of the Swan QUAD motion detector to the Transmitter:
The alarm zones are connected to the corresponding detector relay zones. The Transmitter tamper zones are started on the detector tamper zones.

Since this detector uses 12 V power, it is powered from the outside, using a supply unit or battery.

To place the Transmitter inside the detector body, an interior of at least the following size is required: 110 х 41 х 24 mm. If the Transmitter cannot be installed inside the detector body, use an external radio-transparent body.
The length of the cable can be up to 30 meters of UTP conductor. For a larger cross-section, a longer cable can be used.

Do not install the Transmitter:

  • In a metal body.
  • Under temperature and humidity conditions that exceed the permissible limits for the device.

While selecting the detector installation point with the Transmitter module, the remoteness of the devices from the Ajax Hub and the presence of facilities that prevent the radio signal flow should be considered. Before fixing the detector and the module connected with the screw, test the Transmitter signal level in the Ajax application.

Which devices can be connected to Ajax using the Transmitter

Outdoor motion detector


Transmitter appeared due to the acute need for control of the outdoor areas. Although the current generation of security system Ajax is designed for the protection of the premises, European partners have shown massive demand in this niche. The quick solution became the device for integration with popular outdoor detectors Optex: IR barrier AX-200TFR, “curtain” BX-80NR, combined VXI-RDAM and other models. Together with the Italian colleagues in less than six months, Ajax Systems developed the Transmitter— a universal integration module that solves the problem of outdoor security and at the same time allowing the implementation of dozens of other scenarios.

Domestic gas detector


The gas leakage detectors are designed to promptly detect leakage and give notification thereof. This segment of sensors is popular, since gas is difficult to detect quickly, and the catastrophe risk due to leakage is significant. The sensors are classified according to the type of gas to be detected: natural, carbon dioxide, carbon monoxide (CO) etc. Since all gases are different in weight, there is no universal gas detector. For example, to determine the natural gas leakage, the detector should be placed as high as possible, and as low as possible for carbon dioxide.

For individual purposes and to ensure personal safety, “domestic gas leakage detectors” are used.

☝️ Ajax has a fire detector, which detects temperature rise, smoke, and dangerous concentrations of CO— FireProtect Plus.

Vibration detector


The vibration detector raises an alarm even during a tampering attempt, responding to movement or even the slightest damage to the structure on which it is installed. Such devices are mounted on doors, windows, and fences (it will report attempts to climb over).

For vibration detector to function properly with the Transmitter, it is necessary that the closing or opening takes at least 0.6 seconds. Shorter closings and openings will be ignored by the false response security system.

☝️ Ajax has a combined opening, impact and a tilt detector— DoorProtect Plus.

An IR-type barrier perimeter detector


IR barriers are used when it is necessary to restrict access to a facility from the outside, but at the same time to allow movement along the territory.

And also any other detectors and devices with NC/NO terminals.

Problems that can be solved with the Transmitter

Alarms when the temperature exceeds the specified range


To receive alarms when the temperature rises/falls outside a specified level, an external thermostat is connected to the Transmitter. The temperature range is adjusted on the thermostat. To indicate the upper and lower extreme temperature, use the NO contacts on the alarm loops, and connect the NC contacts to the tamper contacts of the Transmitter.

Gate closure confirmation


To control the gate closure and see the openings/closing history, the Transmitter and a wire reed switch or a limit switch can be used.

Safe control


To protect a safe (art piece or any other valuable object), an external tamper and the Transmitter can be used. When the safe is moved, the tamper button will be clicked, you and the security company will get an alarm.

Water level control


A float sensor makes it possible to monitor the water level in a vessel and send a report if it is exceeded. Such sensors protect the pump from non-load running while pumping water and help to control the water level in a pool or well.

Connection of the security panel alarm button


An external alarm button for sending an alarm to the security panel can also be connected via the Transmitter. Movies often show a bank robbery action, when an employee presses a button under the table and gives an alarm.

The Transmitter application is not limited to the area discussed. If you have ideas or already implemented scenarios, write in the comments.

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