> For the complete documentation index, see [llms.txt](https://wiki.inels.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://wiki.inels.com/inels-bus/3rd-party-integration.md).

# 3rd Party Integration

One of the key strengths of the iNELS ecosystem is its **openness to third-party integration**. Modern buildings often include a mix of technologies and systems—lighting, HVAC, access control, energy management, and property management. iNELS provides multiple integration interfaces, ensuring seamless communication between our central units and external devices or platforms.

### **Integration Interfaces**

#### 1. **MQTT on Central Units**

* All new-generation iNELS central units support **MQTT protocol**, enabling direct connection to IoT platforms, cloud services, and open-source automation systems (e.g., Home Assistant, Node-RED).
* Use cases:
  * IOT projects
  * Cloud-based dashboards and analytics
  * Interfacing with 3rd-party sensors and controllers

#### 2. **Modbus on CU3-10M**

* The **CU3-10M** central unit includes a native **RS-485 Modbus interface**.
* Functions as a **Modbus Master**, allowing communication with HVAC controllers, energy meters, and other Modbus-enabled devices.
* Use cases:
  * VRV/VRF integration via Modbus gateways
  * Energy management (meters, analyzers)
  * HVAC controllers (chillers, AHUs, ducted splits)

#### 3. **DALI on CU3-09M/DALI**

* The **CU3-09M/DALI** central unit acts as a **DALI Master**, directly managing up to 64 DALI ballasts or drivers.
* Provides full support for DALI groups, scenes, and status feedback.
* Use cases:
  * Human Centric Lighting (HCL) control
  * Large commercial or office lighting projects
  * Integration with existing DALI infrastructure

#### 4. **API to iNELS Hotel Reservation (iHRS)**

* The **iNELS Hotel Reservation System (iHRS)** includes an open **REST API** for integration with **Property Management Systems (PMS)**, access control, and booking platforms.
* Enables smooth data flow between hotel front office and room automation.
* Use cases:
  * Automatic room assignment and card issuing
  * Guest check-in/out synchronization
  * Energy-saving automations linked to occupancy

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