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KNX Gateways for Alarm Systems / AJAX-KNX User Manual

Connections and front panel

Power, KNX and Ethernet connections, plus the meaning of the front-panel indicators.

elausys · 12 September 2026
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Connection Diagram

The KNX bus is connected on the top side of the gateway. An external power supply (12–30 VDC) is required and connected on the bottom side of the module, beside the RJ45 connector for the Ethernet cable.

The gateway communicates with the AJAX Hub over the local network via Ethernet to receive events from the Hub. Arming and disarming commands from the gateway require internet access, when enabled only. The connection is established through the AJAX secured cloud using a fully encrypted protocol, identical to the one used by the AJAX mobile application.

Front Panel

ajax-knx-front-panel.png

The front panel is equipped with two green status LEDs:

LEDMeaning
NetworkPhysical connection to the Ethernet network is established
ConnectedCommunication with the AJAX alarm system is established

Additional front panel elements:

ElementFunction
Button “P”KNX programming mode button
Red LEDKNX programming status LED

Frequently Asked Questions

What power supply does the gateway require?

Connect an external 12-30 VDC supply to the bottom screw terminal beside the Ethernet connector.

What do the Network and Connected LEDs indicate?

Network confirms the physical Ethernet link. Connected confirms communication with the AJAX alarm system.

Keep exploring

Find the other guides for this product in the documentation.

Back to AJAX-KNX User Manual