---
title: "KNX video surveillance with Link’nX: cameras and intercoms"
description: "Connect Hikvision, Reolink and UniFi Protect cameras and DoorBird or 2N intercoms to KNX with Link’nX: detections, door commands and scenarios."
canonical: https://wiki.can-nx.com/en/usages/videoprotection/
language: en
---

# KNX video surveillance with Link’nX: cameras and intercoms

Link’nX connects Hikvision, Reolink and UniFi Protect cameras, as well as DoorBird and 2N intercoms, to the installation’s scenarios and, depending on the brand, to the KNX bus. A detection, a doorbell press or an entered code can start a scenario; a KNX button or a scenario action can switch on a floodlight, change a camera’s recording mode or open a door. Each brand has its own path.

## Solutions for your need

| Need | Application | Guide |
| --- | --- | --- |
| Declare a Hikvision or Reolink camera or a UniFi Protect device | Link’nX, **Devices → Security & Access** | [Declare a camera or a Protect device](https://wiki.can-nx.com/en/guides/link-camera-devices/) |
| Start a scenario on a Hikvision event: motion, intrusion, license plate, face | Link’nX, **HIKvision** triggers | [Forward the events from the camera](https://wiki.can-nx.com/en/guides/link-hik-events-setup/), then [use them in Link’nX](https://wiki.can-nx.com/en/guides/link-hik-automation/) |
| Switch on the floodlight, activate the siren or go to a Reolink PTZ position from a KNX button | Link’nX, Reolink gateway | [Associate a Reolink camera with KNX](https://wiki.can-nx.com/en/guides/link-reolink-gateway/) |
| React to a Reolink motion, person, vehicle or pet detection | Link’nX, **reolink** triggers | [Control a Reolink camera and use its detections](https://wiki.can-nx.com/en/guides/link-reolink-automation/) |
| Change the recording mode, or react to a UniFi Protect doorbell, motion or leak | Link’nX, **unifi_protect** actions and triggers | [Control UniFi Protect and react to events](https://wiki.can-nx.com/en/guides/link-unifi-protect-automation/) |
| Read a Protect device’s detections and measurements back on the bus | Link’nX, UniFi Protect gateway | [Associate UniFi Protect with KNX](https://wiki.can-nx.com/en/guides/link-unifi-protect-gateway/) |
| Open a door or react to the doorbell of a local DoorBird | Link’nX, **DoorBird (local)** | [Declare the local DoorBird](https://wiki.can-nx.com/en/guides/link-doorbird-local/), then [use its doorbell, motion and relays](https://wiki.can-nx.com/en/guides/link-doorbird-local-automation/) |
| Create or delete a DoorBird Cloud keypad code from KNX | Link’nX, **DoorBird Cloud** gateway | [Connect the DoorBird Cloud](https://wiki.can-nx.com/en/guides/link-doorbird-cloud/), then [associate its code commands](https://wiki.can-nx.com/en/guides/link-doorbird-cloud-gateway/) |
| Control a 2N door switch or react to a call, a code or a card | Link’nX, **2N** actions and triggers | [Declare the 2N intercom](https://wiki.can-nx.com/en/guides/link-2n-device/), then [use its commands and events](https://wiki.can-nx.com/en/guides/link-2n-automation/) |

Triggers and actions are then used in a [Link’nX scenario](https://wiki.can-nx.com/en/guides/link-compose-scenario/), on their own or with KNX actions.

## Good to know

- A saved declaration does not confirm the connection to the hardware, and an offered command does not guarantee the model’s capability. Test each command and each detection on the device.
- Hikvision: the camera itself forwards its events to Link’nX. In the variant illustrated by the help, the destination is set in **HTTP Data Transmission**, with the URL **/hik** and port 4000, then **Notify Surveillance Center** is checked for each event.
- In a 2N or Hikvision trigger, all the criteria filled in must match the received event; an empty field or **--** ignores the criterion.
- Reolink: a trigger waits for a new detection. A detection that stays active does not restart the scenario.
- Local DoorBird: doorbell and motion events require an intercom on the same network broadcast domain as Link’nX, with firmware from November 2023 or later.

Brand pages: [Hikvision](https://wiki.can-nx.com/en/integrations/hikvision/), [Reolink](https://wiki.can-nx.com/en/integrations/reolink/), [UniFi](https://wiki.can-nx.com/en/integrations/unifi/), [DoorBird](https://wiki.can-nx.com/en/integrations/doorbird/) and [2N](https://wiki.can-nx.com/en/integrations/2n/). For doors, codes and bookings, see [Access control](https://wiki.can-nx.com/en/usages/acces/).

## All Security and video surveillance guides

### Devices and integrations

- [2N intercom in Link’nX: switch actions and event triggers](https://wiki.can-nx.com/en/guides/link-2n-automation/)
- [Add a 2N intercom in Link’nX: HTTP API account and XML import](https://wiki.can-nx.com/en/guides/link-2n-device/)
- [Add a Hikvision, Reolink or UniFi Protect camera in Link’nX](https://wiki.can-nx.com/en/guides/link-camera-devices/)
- [Connect a DoorBird Cloud intercom to Link’nX: status and troubleshooting](https://wiki.can-nx.com/en/guides/link-doorbird-cloud/)
- [DoorBird Cloud and KNX: create and delete access codes](https://wiki.can-nx.com/en/guides/link-doorbird-cloud-gateway/)
- [Local DoorBird in Link’nX: declare the intercom and its relays](https://wiki.can-nx.com/en/guides/link-doorbird-local/)
- [Local DoorBird and KNX: doorbell, motion and door opening](https://wiki.can-nx.com/en/guides/link-doorbird-local-automation/)
- [Hikvision in Link’nX: event triggers and privacy mask](https://wiki.can-nx.com/en/guides/link-hik-automation/)
- [Hikvision Alarm Server: send camera events to Link’nX](https://wiki.can-nx.com/en/guides/link-hik-events-setup/)
- [Reolink in Link’nX: control a camera and react to its detections](https://wiki.can-nx.com/en/guides/link-reolink-automation/)
- [Reolink and KNX: map commands and feedback to group addresses](https://wiki.can-nx.com/en/guides/link-reolink-gateway/)
- [UniFi Protect: scenario commands and triggers in Link’nX](https://wiki.can-nx.com/en/guides/link-unifi-protect-automation/)
- [UniFi Protect and KNX: map commands and feedback to group addresses](https://wiki.can-nx.com/en/guides/link-unifi-protect-gateway/)