Dimming from KNX level

Owned by Mateusz Borycki (Unlicensed)
Last updated: Mar 25, 2024 by Joanna Kozakiewicz
3 min read

Using this flow you will be able to adjust the DALI luminaire's brightness in the E2D system from the KNX level. The program described in this article is associated with dimming up/down using KNX buttons.

Installing KNX library for Node-RED

You need to install node-red-contrib-knx-easy library for Node-RED. You will do that in Settings.

  • Open the Node-RED and go to the Settings tab and select Settings [1].

 

  • Go to the Palette [2] tab. Here you can see all the libraries installed in the current Node-RED version. Select the Install tab [3]. Type in node-red-contrib-knx-easy [4] in the search bar and click the Install button [5] for the needed library.

 

3. You will recieve a prompt message. Read the node documentation and select Install [6] to confirm your action.

KNX messages structure

We can receive the following information from the KNX system:
{"decr_incr":1,"data":1} - start ‘up’
{"decr_incr":0,"data":1} - start ‘down’
{"decr_incr":0,"data":0} -stop dimming

Step-by-step instructions

Import the ready made flow using the instructions here: Importing a Node-RED flow or follow the instructions below.

[{"id":"71227ab4.ab1284","type":"function","z":"fd4e3895.5784f8","name":"funcion dimming KNX to E2D","func":"\nif(msg.payload.decr_incr==1 & msg.payload.data==1)\n{\n msg.payload= { \"HOLDUP\" : 1 };\n return msg;\n}\nelse if(msg.payload.decr_incr==0 & msg.payload.data==0)\n{\n msg.payload= { \"HOLDUP\" : 2 };\n return msg;\n}\nelse if(msg.payload.decr_incr==0 & msg.payload.data==1)\n{\n msg.payload= { \"HOLDDOWN\" : 1 };\n return msg;\n}\nelse if(msg.payload.decr_incr==0 & msg.payload.data==0)\n{\n msg.payload= { \"HOLDDOWN\" : 2 };\n return msg;\n}\n","outputs":1,"noerr":0,"x":630,"y":540,"wires":[["a0a22a2e.69b948"]]},{"id":"799f6b8b.d8bf4c","type":"knxEasy-in","z":"fd4e3895.5784f8","server":"dfe0bfd2.ff9b","topic":"0/0/8","dpt":"3.007","initialread":false,"notifyreadrequest":false,"notifyresponse":false,"notifywrite":true,"name":"Dimming 0/0/8","x":260,"y":540,"wires":[["71227ab4.ab1284"]]},{"id":"a0a22a2e.69b948","type":"vertex action","z":"fd4e3895.5784f8","name":"Dimming","typeButton":"dimm","bPayload":{"DON":{"action":"noreact","group":"29842950807acaf4bf4d5eb07a7b4d72","param":null,"priority":"254"},"HOLDUP":{"action":"upaction","group":"29842950807acaf4bf4d5eb07a7b4d72","param":null,"priority":"254"},"HOLDDOWN":{"action":"downaction","group":"29842950807acaf4bf4d5eb07a7b4d72","param":null,"priority":"254"},"DOFF":{"action":"noreact","group":"29842950807acaf4bf4d5eb07a7b4d72","param":null,"priority":"254"}},"bState":false,"defaultpriority":true,"x":920,"y":540,"wires":[["62b76853.8a5288"]]},{"id":"62b76853.8a5288","type":"vertex cluster","z":"fd4e3895.5784f8","userouting":false,"rate":5,"x":1190,"y":540,"wires":[]},{"id":"8ae7ffd4.b73d98","type":"comment","z":"fd4e3895.5784f8","name":"Set correct IP of the KNX gateway!","info":"","x":320,"y":440,"wires":[]},{"id":"f9bd13ea.1bc25","type":"comment","z":"fd4e3895.5784f8","name":"Confirm the group address","info":"","x":300,"y":480,"wires":[]},{"id":"dfe0bfd2.ff9b","type":"knxEasy-config","host":"10.0.6.100","port":"3671"}]

 

1. After importing the flow go to the first node - knxEasy-in. Set the gateway, group address and Datapoint . Provide the the KNX IP gateway (like router IP) and port of the gateway (the one in the flow is an example) [7]. Check if the group address [8] given in the knxEasy-in node are the same as the one you set in ETS software. Datapoint [9] should be set to 3.007 in both .

 

The Vertex node is set, so you do not need to make any changes.

Do not forget to click Done and Deploy!