# KNX Ultimate Device. Filter Group Addresses

**URL:** <https://discourse.nodered.org/t/knx-ultimate-device-filter-group-addresses/94599>\
**Category:** General\
**Created:** [14 January 2025 03:53 UTC](https://discourse.nodered.org/t/knx-ultimate-device-filter-group-addresses/94599 "2025-01-14T03:53:17Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![diageva](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/diageva/32/98015_2.png) [@diageva](https://discourse.nodered.org/u/diageva)\
**Post date:** [14 January 2025 03:53 UTC](https://discourse.nodered.org/t/knx-ultimate-device-filter-group-addresses/94599/1 "2025-01-14T03:53:17Z")

</div>

Node Red vers.v4.0.8 of HA  
Node-red-contrib-knx-ultimate 3.3.9  
KNX DEVICE. Configuration. Group Addr.

I have 2 problems.  
1.  
I want to work with, not only with one Group Addresses, but with all the  
Group Addresses of a Main Group Number, but I cant do it. I dont know how.  
KNX DEVICE. Configuration. Group Addr  
I want to read any group address that maingroupnumber is 11.  
I have this options:  
a.dropdown list  
Configuration. Group Addr:  
If I select from dropdown list 11/-/- = ERROR

b.$Env variable to read the group address from an environment variable.  
I don't know how.

c.Select Universal mode (listen to all Group Addresses) to react to ALL group addresses.  
Configuration. Group Addr:  
I did select this one, but I would like to filter.

1. I want to read and write in a group address that is:  
11/5/X  
Where X is msg.gainfo.ganumber from a node that gives the info.  
For that:  
KNX DEVICE.  
Configuration. Group Addr:  
11/5/${msg.gainfo.ganumber} = ERROR  
I don't know how to use $Env

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<div class="post-metadata">

**Author:** ![system](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/1X/d073cd938eafa2e558d7c2cd59003b3ef4963033.png) [@system](https://discourse.nodered.org/u/system)\
**Post date:** [14 April 2025 03:53 UTC](https://discourse.nodered.org/t/knx-ultimate-device-filter-group-addresses/94599/2 "2025-04-14T03:53:19Z")

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