Controlling KNX lighting from a third-party touchscreen via HTTP, while preserving KN

[ADEHS]

Hello,
I’m working on a project using a LogicMachine 5 (Lite or KC) as an interface to a KNX-based lighting system.
We plan to control some KNX lighting functions — ON/OFF, dimming, and scenes — from a third-party touchscreen interface (AMX Varia SL50), using HTTP commands sent from a NetLinx controller.
At the same time, the KNX system includes automation logic (e.g., light sensors for daylight-based control), and it is important that this automation remains functional after manual control. For example, if someone turns a light off from the touchscreen, the KNX system should later be able to turn it back on based on sensor input or time schedules.
I’d like to ask:

• Is it technically possible to control the same KNX lighting objects from HTTP commands (NetLinx) without disrupting the existing KNX automation logic?
  
• Are there any best practices or configuration steps in LogicMachine to handle priorities, overrides, or ensure recovery to automatic behavior?
  
• Additionally, we plan to monitor the lighting status via BACnet/IP from a Niagara BMS. Is it possible to expose these KNX objects to BACnet in parallel with HTTP control?
  

This is my first LogicMachine project, so I appreciate any guidance or examples.

[Daniel]

1. Use this: https://kb.logicmachine.net/misc/remote/
2. There is nothing like that in KNX as priority, last telegram wins. You can use script and create priority in it based on date from few objects and write to another.
3. Yes no problem.

[ADEHS]

Thanks again for the help.

I’ll be reviewing the link you shared and looking into how HTTP control can be managed from the NetLinx controller, since I don’t handle that part of the system directly. Once we begin the integration with LogicMachine, I’ll share how it goes or follow up if any questions come up along the way.

[ADEHS]

Sorry for the late reply; the project has only recently been completed.

Regarding the NetLinx controller and the AMX screens, the team ultimately decided to use a KNX IP Router for the lighting integration.

However, for a future phase of the project, we plan to fully integrate the touchscreens through the LogicMachine. This upcoming stage will involve creating lighting scenes and implementing the BACnet integration we discussed.

Thanks again for your help and guidance!

[PedroPinto]

Hello, i'm new in this forum and to avoid creating a new topic i have a couple questions that are almost the same subject of this topic.

I have lets say 4 buildings each one with their own knx installation and each one has an IP Router with their own distinct IP Address. I wish to read some specific group addresses from each IP Router and then export this data into bacnet also to some sort of BMS thats reading this data through that protocol(bacnet), i want to know if this is possible, first approach i'm only interested to read group addresses not locally by TP but by IP. Right now i have Logicmachine Lite (HW: LM5 Lite (i.MX6)
SW: 20240426), IP Router, IP Interface and a couple of actuators as test bench.

[Daniel]

Are those building on the same network/subnet?

[PedroPinto]

Are those building on the same network/subnet?

right now i dont have access to the topology of the network but they should all be on the same local network/subnet

[Daniel]

If they are on the same network then no problem. LM will talk to the routers over KNX multicast. You will need to add objects to filter table for LM to see them and then LM will convert them to bacnet.
https://kb.logicmachine.net/integration/bacnet-server/

[PedroPinto]

If they are on the same network then no problem. LM will talk to the routers over KNX multicast. You will need to add objects to filter table for LM to see them and then LM will convert them to bacnet. 
https://kb.logicmachine.net/integration/bacnet-server/

Thank you for the help, so every ip router from the network has to have the same multicast address that we set up on KNX connection mode IP Routing correct?

[Daniel]

Yes and LM