Ajax Systems — Jeweller Wireless and Fibra Wired
How Ajax's two communication technologies work, what the Hub 2 Plus can do, and how Ajax security integrates with KNX building automation.
Ajax Jeweller — the wireless protocol
Ajax Jeweller is a proprietary 2-way wireless protocol developed by Ajax Systems (Ukraine). It operates at 868 MHz — the EU ISM band for security devices — using encrypted communication:
Frequency
868 MHz (EU)
Modulation
DSSS (spread spectrum)
Encryption
AES-128 with Diff-Hellman
Range
2 km open field, 800m indoor
Communication
2-way (device ↔ hub)
Tamper
Physical + signal
The key advantage of 2-way communication: the hub knows exactly when each device last checked in and detects signal jamming. If a detector goes silent, Ajax triggers a jamming alert — unlike basic 1-way systems where a jammer can silently disable all detectors.
Ajax Fibra — wired bus
Ajax Fibra (2022) is Ajax's answer to the growing demand for wired detection in commercial buildings. Fibra uses a 4-wire bus (2× power + 2× data) with RS-485 protocol and AES-128 encryption:
Fibra allows mixing wired and wireless devices on the same Ajax Hub — Jeweller wireless sensors in open areas, Fibra wired detectors in shielded rooms, underground carparks and server rooms where RF is unreliable.
Ajax Hub 2 Plus — capabilities
Jeweller lines
4 (up to 100 devices each)
Fibra lines
4 (up to 100 devices each)
Total devices
200 (wireless + wired)
Users
200 user accounts
Partitions
50 partitions
Connectivity
2× Ethernet + 2× SIM
API
Ajax Cloud API (webhooks)
Integrations
KNX, Loxone, C-Bus, Alarm.com
Cloud monitoring
Yes (Ajax Cloud)
Ajax KNX integration
Ajax integrates with KNX via the Ajax uartBridge or via cloud webhooks to a KNX IP gateway. The preferred method for in-panel integration:
Ajax Hub 2 Plus sends webhooks to a local home automation server (e.g. Node-RED, iobroker) on alarm events
Server translates events to KNX group address writes (e.g. arm/disarm → KNX scene trigger)
KNX responds to intrusion alarm: turn on all lights at 100%, trigger AV notification, unlock emergency exits
KNX disarm when Ajax armed-away: HVAC setback, blinds to eco position, lighting off
Alternatively: Ajax ioBridge connects directly to KNX IP router via DryContact/uartBridge modules
Ajax device range overview
| Device | Type | Protocol | Notes |
|---|---|---|---|
| MotionCam | PIR + camera | Jeweller | Photo on alarm for visual verification |
| DoorProtect Plus | Door/window + shock | Jeweller/Fibra | Reed contact + tilt + shock sensor |
| GlassProtect | Glass break | Jeweller/Fibra | Acoustic sensor, 9m range |
| CombiProtect | PIR + glass break | Jeweller | Two sensors in one detector |
| FireProtect Plus | Smoke + CO + heat | Jeweller | Triple fire detection |
| WallSwitch | Relay output | Jeweller | Controls 3kW loads, for KNX relay input |
| Socket | Smart socket + energy | Jeweller | 230V monitoring, 2.3kW |
| KeyPad TouchScreen | Code panel + RFID | Jeweller | Color display, ArmBand compatible |
Ajax integrated with your KNX panel
We design Ajax + KNX integration: panel wiring, webhook configuration, scene automation for arm/disarm events.
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