Satel ABAX2 vs Ajax Jeweller: Technical Comparison for European Smart Buildings
Head-to-head comparison of Satel ABAX2 (ACU-280, 150 devices, fully offline KNX bridge) and Ajax Jeweller (Hub 2 Plus, 100 devices, cloud API) — range in real building conditions, KNX integration path, EN 50131 certification, and use case recommendations for Baltic, Polish, and Central European projects.
Overview
Both Satel ABAX2 and Ajax Jeweller operate on the 868 MHz EU license-free band, use bidirectional encrypted communication, and are suitable for professional security and building automation applications. The choice between them affects KNX integration complexity, offline reliability, sensor portfolio, and certifications available.
Protocol Specifications Side-by-Side
| Parameter | Satel ABAX2 | Ajax Jeweller |
|---|---|---|
| Frequency | 868.0 MHz, bidirectional | 868.0-868.6 MHz + Wings (2.4 GHz config) |
| Modulation | GFSK | GFSK |
| Access method | TDMA, 3-second polling cycle | TDMA, 7.3-second polling cycle |
| Encryption | AES-128, per-device key | AES-128, per-device key, rotating session keys |
| Controller | ACU-280 (150 devices), ACU-100 (30 devices) | Hub 2 Plus (100 devices), up to 25 hubs per site |
| Open-air range | 500-800m (ACU-280 to sensor) | 2000m (Hub 2 Plus to sensor) |
| Communication bus | RS485 to INTEGRA alarm panel | Ethernet + dual SIM (LTE/2G) |
| Local operation | Fully offline, no internet required | Partial — Hub stores events, API requires cloud |
| EN 50131 Grade 2 | ACU-100 + INTEGRA | Hub 2 |
| EN 50131 Grade 3 | ACU-280 + INTEGRA 128 | Hub 2 Plus |
Range in Real Building Conditions
ABAX2 ACU-280 at 868 MHz through building materials: concrete wall (20cm) loses 15 dB, brick wall (25cm) loses 12 dB, reinforced floor slab loses 20-30 dB. Link budget: ACU-280 provides 70 dB margin. Through 4 walls of 25cm brick: 48 dB attenuation leaves 22 dB margin — reliable. Through one reinforced concrete slab: 30 dB attenuation leaves 40 dB margin for ground floor, but multi-floor penetration requires a repeater.
Ajax Jeweller Hub 2 Plus at 868 MHz: the published 2000m range implies a higher link budget (estimated 85-90 dB at maximum range), providing better penetration through building fabric. In practice, through the same 4 brick walls, Ajax maintains a strong signal where ABAX2 may show marginal performance. The Ajax ReX repeater (one hop) effectively doubles building penetration.
Verdict for multi-floor buildings: Ajax Jeweller has better range, particularly with the ReX repeater infrastructure. ABAX2 is competitive in single-floor or few-storey buildings with low concrete content. For Baltic masonry construction (thick brick walls, concrete inter-floor slabs), plan one ARU-100 or ReX repeater per floor regardless of which system is chosen.
KNX Integration Path
ABAX2 + INTEGRA to KNX: fully local integration via INTEGRA INT-RS RS232 serial bus to KNX-INTEGRA bridge, or via ETHM-1 Plus TCP/IP to Home Assistant/IP-Symcon KNX bridge. No cloud dependency. Integration is mature, well-documented, and used in thousands of KNX + Satel projects in Poland, Czech Republic, and Baltic states.
Ajax to KNX: REST API webhooks via cloud (ajax.systems servers). No LAN-only API. Requires permanent internet connectivity for real-time event delivery to KNX. Outage of ajax.systems cloud = no KNX sensor events. Cloud latency: typically 0.5-2 seconds from sensor trigger to KNX telegram delivery.
Verdict for KNX integration: ABAX2/INTEGRA is strongly preferred for LAN-reliability and zero cloud dependency. Ajax is suitable for non-critical automation (occupancy hints, ambient monitoring) where cloud dependency is acceptable, but not recommended for security-critical KNX event delivery.
Sensor Portfolio
ABAX2 highlights: AMD-102 PIR (3-year battery), AMD-200 PIR+MW dual-tech (anti-masking), ATD-100 glass break, ADD-200 door contact, ATF-100 temperature, AFS-100 flood. All sensors report zone state every 3s and on event. Bidirectional: ACU-280 can command the ASW-210 wireless output module.
Ajax Jeweller highlights: MotionCam (PIR + photo verification on trigger — unique in the market), DoorProtect Plus (contact + shock + tilt), FireProtect Plus (smoke + CO + heat), LeaksProtect (3-point flood), ThermoSensor, WaterStop (motorised water valve control). The photo-on-trigger function is a clear differentiator — Ajax sends a photo to the monitoring centre on each alarm trigger, reducing false alarm responses.
Use Case Recommendations
Choose ABAX2 when:
- +KNX LAN-only operation required (no cloud)
- +Building already has INTEGRA alarm panel
- +Polish or Baltic market installer with SATEL training
- +Grade 3 security certification needed for high-value objects
- +Integration with existing Satel wired zones required (INTEGRA handles both)
Choose Ajax Jeweller when:
- +Cloud connectivity is reliable and acceptable for the application
- +Photo verification on motion events is required by client or insurer
- +Rapid deployment without alarm panel programming needed
- +Long-range multi-floor building with few wired zones
- +Professional monitoring centre integration (Ajax PRO Desktop required)
Both systems can coexist in the same building — ABAX2/INTEGRA for security zones requiring KNX LAN integration and Grade 3 certification, Ajax Jeweller for occupancy and environmental sensing fed to KNX via Node-RED webhook bridge where cloud latency is acceptable.
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