ETS v6.4.0

Released: 25 February 2026, Build 8658

Efficiency Meets Simplicity 

Built for installers. Optimized for real projects.  

Watch the ETS 6.4.0 release teaser video here! and release party video here!

✅New features

• Multi Linking: Lets you link dozens of groups and objects in a single action. Just hold Alt while dragging. That's it. What used to take 20 minutes now takes 20 seconds. Perfect for large projects with hundreds of links.

  ETS6.4 - Multi Linking

• Auto Backup to Archive: Creates a new Project version in the Archive every time you close your project. Set once, protected forever. Essential for KNX Secure projects. Works seamlessly with linked folders for team collaboration.

  ETS6.4 - Auto Backup to Archive

• Download via Serial Number now available as default: Enable once, use automatically. Program your entire installation from your desk. No more running around pressing programming buttons.

  ETS6.4 - Download via Serial Number

• Room & Function in Group Views: Room and Function columns now available in all Group Address views. Introducing a structure that supports efficient workflows. Building Functions are finally practical for everyday use.

  ETS6.4 - Rooms & Functions in Group Views

• Smart Linking Ready: Products with a green Device icon are ready for upcoming Smart Linking features that will bring intelligent automation to ETS. The foundation for the future of KNX programming.

  ETS6.4 - Smart Linking Ready

• Native Firmware Updates: A new standardized method for Firmware Updates on KNX Devices. Disclaimer: Not all KNX Devices are compatible with native Firmware Update functionality yet.

ETS 6.4.0 Also Includes:

• MDU Support - Multi-Dwelling-Units modelled correctly.

  ETS6.4 - Multi-Dwelling Units

• Compatibility Mode - Smart 64-bit/32-bit switching.

  ETS6.4 - Compatibility Mode & Project Sorting

• Project Sorting - Sort by Modified Date in Dashboard Drilldown, both for Local Projects and in the ETS Archive.

  ETS6.4 - Compatibility Mode & Project Sorting

• Performance - Under-the-hood Improvements throughout.

• Repeater Hints – Indicating lack of Filter Tables.

  ETS6.4 - Couplers Configured as Repeaters

• Monitors Panel - Clearer naming.

You Prefer The Technical Details?

✅Epics

• Adapt the ETS representation of the KNX topology
• CloudConnections: Support AccessToken Authentication
• Improve Cloud Licensing Initialization Phase
• Improve KNX/IoT-Point API Support
• Improvements to Online Diagnostics tools
• KNX Firmware update
• Multi Linking: Alt Paste for Group Addresses
• New Security Bubble Concept: Persist the Object Security State Calculation Results
• SDK and App-related improvements
• Semantic Data related Improvements
• Update Security Notice Dialogs

📈Stories

• Add filter option for Smart Linking ready devices in catalog
• Added option to reset compatibility mode for next regular start of ETS
• Added optional columns "Building Part" and "Function" to the group address detail view
• Allow the building parts to be under a ‘Floor'
• Auto Backup: Added a setting to automatically backup archived projects on project close
• Automatic reduction of ApduLength (also for secure devices)
• Connect to SLE device via SecurityProxy is slow
• Dashboard: Allow sorting of projects according to date
• Dashboard: Persist the sorting order in the drilldowns
• Display Info for TP/TP-Couplers in Repeater Mode
• Double the max width of the sidebar
• Firmware version display in Device Info
• Fix security status inconsistency by adding security state for group objects
• For areas, swap "Main Line Medium" and "Area Name" in the sidebar
• Handle area names that were filled with legacy default strings
• Handle main line names that were filled with legacy default strings
• Implement a tree-structure (including sub-group ranges) for the Security Proxy Tables
• Improve IP discovery frequency in ETS
• Indicate the compatibility mode in the ETS title bar
• IoT Point API - Implement Checks before Firmware Update for Hardware reference, Manufacturer and any any Additional checks for IoT
• IoT Point API - Implement Support for Software Update Pauses when receiving a CoAP Max-Age Option
• IoT Point API - Improve IoT Hawk Handling of Filter Table Key being provided as null for Secondary Side of an IoT Router
• IoT Point API - Improve Performance for Software Update
• IoT Point API - IoT Router Specification Change - Hawk Must configure number of Booleans for DPT 21 (B8) and DPT 22 - E.g. configure 3 for (r7B3 being used instead of B8)
• IoT Point API - Preparations in Falcon for ETS SDK Extensions for Supporting CoAP [Millefeuille]
• IoT Point API - Support IPv4 properties for IoT Router
• IoT Point API- Not Supported Messages for Online Installation And Error Diagnostics functionality for IoT Devices
• Move the Cancel button of the "Interface check" dialog to the far right
• Polish the “Compatibility” section of the settings
• Programming flags of affected devices in their security bubble need to be reset after adding a secure coupler
• Remove the security notification for devices that must be re-downloaded
• Rename the “Diagnostics” panel to “Monitors”
• Rename the “Project Password Manager” app to “Project Access Assistant” to better reflect purpose
• Semantic Export - Use Ontology TTL file from ProgramData/KNX/Semantics/Ontology
• Settings: Better visualize settings with cascading behavior
• Show RF Multi FastAck info in IAck column in Bus monitor
• Smart Linking: Show “Smart Linking Ready” as visible channel characteristic
• Smart Linking: Show in the Online Catalog if a product is "Smart Linking Ready"
• Smart Linking: Show on the device instance if a product is "Smart Linking Ready"
• Sort the room list alphabetically
• Splash screen & about dialog: Display the currently used ontology version
• Switch from item scrolling to seamless scrolling in Sidebar Pending Operations lists
• Topology: Rename the static text of backbone and areas to 0.0 backbone line / n.0 main line
• Update ETS to use KIM library 1.4
• Use SN by default for all downloads when enabled
• Visualize "Starting in Compatibility Mode" in the Splash Screen
• When a device does not support Busmonitor mode and the user requests to use Bus Monitor, show an Error
• When a new device/Individual Address enters a secure bubble of a group address, the programming flags of devices in different bubbles must not get reset
• When calculating for which devices programming flags need to be reset, security bubbles need to be taken into account
• When linking an additional assocation to a sending group object (same group address to different group object) of an already sending device, programming flags shall not reset
• When unloading multiple devices, add a delay

🛠️Bug fixes

• Able to Rename/Edit Default Workspaces
• Active Pending History Reverses The Active Lists After Clearing History
• Add ModuleDef on Application Program
• Add Rooms from the edit option having a different symbol than breadcrumb
• Added condition to Search Folders is not taken into account
• Adding additional devices to the download queue repeatedly triggers persistence
• After receiving a Restart_Response, wait for 1000ms
• ALT + V did not work in Detail view after Tree view
• App integrity check hangs when validation check fails
• Archive chain in alive all the time
• Blank gray area appears when resizing a collapsed sidebar
• Building Parts are not updated in store update
• Changing project description does not update sync state on local project tile
• Check why binding redirect for System.ValueTuple is required on some machines
• Cleaning up spurious security elements and/or attributes from legacy projects
• Compare Device: Dialog "Device Compare Exceptions" change size
• Connection Manager gets not refreshed during runtime
• Context Help not correctly updated in some cases in Modules
• Crash on Deleting Group Address Linked to Dummy Device – "Collection was modified" Error
• Creating many Group Addresses takes very long
• Dashboard Drilldown initial sorting not accord to setting
• Detail view has no selected tab
• Device Compare: Text in "Device Compare Detail" is cut off
• DeviceTemplates: Error when selecting TreeNode
• Difference in tree view and detail view context menu
• Display problem when switching two Renames with same text.
• Download canceled, although "Continue" was selected
• Download is wrongly executed in RF Multi SLE
• Search Folders: Can not create folder in Content Panel area
• Empty group addresses detail view & flickering breadcrumb in German
• Error when copy room with device in empty project with group address-style two-level
• Error when editing Individual Address in topology panel — inconsistent deletion and update behavior
• ETS Accidentally Processes IoT QR Codes as KNX Classic QR Code leading to wrong Serial Number
• ETS crash after expanding tree view
• ETS6 Licensing Issue When Logged in as User: "Run Demo" instead of “Skip Login” shown
• Exception occur during multi selection
• Exception occurs in Link with dialog
• Exception when installing certain Dali App
• Exception: System out of memory exception
• Expanded description column does not show full content
• Exporting Project leads to error
• Extended copy: No associations when copying into other project
• Extended Copy: Number of copies cannot be changed with the arrowbuttons
• Fallback from PID_MAX_ROUTER_APDULENGTH to PID_MAX_APDULENGTH for certain value
• Find & Replace: Additional Adresses are not marked when found
• Find and replace does not work for devices where a channel has no display name
• Fix the sorting of the filter table preview
• Function detail view: column configuration is not applied/stored
• Group Address Import: Wrong encoding for umlauts when importing Group Address with line break in description
• Grid Search Function does not work correctly for the group monitor (DPT cannot be filtered)
• If "set to default" fails due to invalid parameter values, there is no user info
• If the detail view column that is used for sorting is deactivated, the changes are not persisted
• import all translations in same file
• Improve performance for undo/redo in DCA
• Incorrect Device Count Displayed When Project Remains Open
• Incorrect Highlight Color in Detail View When Navigating with Tab Key
• Increase timeout when checking for outbound segment coupler
• Inplace Edit does not work after warning message.
• Intermittent Error When Sorting and Refreshing Archive Version
• Internal Error When Linking/Unlinking Group Address to RF Device Without Individual Address
• Internal Error When Re-adding Previously Deleted Device After Project Reopen
• IoT Point API - Correct Handling of mDNS IPv4 Responses
• IoT Point API - Correctly Handle IoT Router Configuration of Legacy Devices
• IoT Point API - Correctly Show Failed Software Updates as an Error
• IoT Point API - Creation of Device Image during download had a regression causing the creation to take over 20 minutes
• IoT Point API - During Firmware Update the Version Check Should not Consider a Trailing 4th Part with a 0
• IoT Point API - If UDP layer fails sending CoAP Message Group Monitor Still Shows The Message as having been sent
• IoT Point API - Improve IoT Router Download Device Image Creation Speed
• IoT Point API - Overwrite Individual Address Diagnostic Function Does Not Work With Sleepy Devices
• IoT Point API - Pop-up when receiving a mDNS response but it being impossible to resolve an IPv6 Address for the response
• IoT Point API - Problem with the IoT Router Configuration for Some DPT 21 / 22 Subtypes
• IoT Point API - Reduce Repeated CoAP Multicast Operations for Download All
• IoT Point API - Support for Sleepy Devices that Fall asleep during download - Keep listening for responses from device for at least one sleep cycle
• IoT Point API: Fix Out Of Memory Issue due to mDNS Discovery
• Issue with Language setting
• It is not possible to import password-protected projects which are Pre-ETS4 style
• Items lose focus after switching from one panel to another
• Fix error "Key not found" in certain projects
• Keyboard shortcut Ctrl+Alt+A Shows Error
• Label print: Fails to Print Label for Some Devices.
• Label print: Can't print some labels on German systems
• Local DeviceManagement via USB does not work from (Scripting) SDK
• Make the header text from the column "Devices" vertically aligned like the other columns
• Merge does not add Serial number
• Middle mouse wheel works in one ParameterComboBox and in the other not
• Missing breadcrumb update in parameter dialog when changing parameter
• Modular group objects in a modular channel are not available directly after copying a device
• Monitor: Continuous recording might try to write after close
• Monitor: Telegram logs always saved to default location ignoring custom path
• Monitor: Condition Names not localized
• Monitor: Conditions for address is missing "between"
• Monitor: In the Settings, the  Active Decoding AppId is not persisted
• Monitor: In Bus Monitor, after re-opening a broken USB connection, Busmonitor mode is not completely restored
• Moving middle group will change group address despite validation error
• Multiple selection is not working correctly, after reopening the project
• Multiple selection in the tree leads to incorrect grouping of objects in channels
• Multiple selection Parent-Child Elements in the Tree leads to duplicate counting of Devices
• No Option to Re-enable Warning Message After Selecting "Don’t Show Again" while using clear button in Monitor Window
• Non relevant checkbox appears in the download progress bar
• Exception when trying to add linked folder while initial archive enumeration is still running
• Null reference exception in UnlinkCommandHandler when copy device or unlink group address from group object
• On some computers, creating diagnostic files results in an error
• Opening "Local Projects" reset the last used projects
• Order of the currently downloaded device changes
• Paste extended: Unable to perform paste extended for IP router under room
• Performance - Problem when expanding tree view in buildings view
• Performance - Decrease when using project with a lot of Group Addresses
• Picture quality decrease in the parameter dialog
• PID_TEMP_DA_FILTER_CONTROL not set correctly after download of Media Coupler
• Ping using direct IP connection fails
• Premature Sync (before dead time ends)
• Project order changes after clicking Edit Tags pencil icon (without modifying tags)
• Project order not updating after opening panels in second project under Local Projects
• Scan for devices in programming mode, results disappear in fast sequence
• Scrolling problems in Group Addresses
• SDK: Building Part usage cannot be removed
• SDK: When adding secure-enabled device into non-password-protected project, device becomes secure
• Search and replace needs a double click to replace the description of a Group object
• Search folder detail view does not update
• Search toolbar shifts to the next line after the "Toggle use for this project" button is added under "Manage Configured Interfaces"
• Select different types in tree via keyboard navigation leads to exception
• Settings: Compatibility dropdown menu cropped with slim ETS
• Sidebar does not display Info for TP/TP Couplers correctly.
• Sidebar groups container: Fix selection behavior
• Single selection (Detail view) gets not saved in the workspace
• Some operations are slow and cause an unresponsive UI
• Spinner control is not working anymore
• Startup too long when no internet connection available
• Strange undo history entries after deleting group address
• The "Assigned IP Address" does not get persisted for legacy IP devices with IPConfig=Custom
• Treeview order is not correct after moving a line
• UI Issue: Project Tiles Only Partially Displayed in ETS
• Unable to Change Device Individual Address Beyond the Highest Existing Address
• Unable to Modify Device Individual Address Using Arrow Controls
• Undo redo does not restore custom channel name when custom name was cleared
• Using semicolon in device description and using label creator let ETS freeze
• When changing Group Address in sidebar the adress did not change when the next adress is blocked by another middle group
• When copy area with secure RF lines, error logs are created
• When copy IP area with extended copy, resulting area has medium type TP
• When deleting an area, in the dialog the area name is shown instead of the main line name
• When downloading a selection of TP/IP devices the download crashes
• When exporting project with more than one DCA, only one DCA is attached as user file
• When linking Group Address with "Link with", name of the Middle Group is not correctly shown
• When moving a RF Coupler the address is changing
• When restart in compatibility mode is necessary while in extended copy, won't restart
• When selecting devices via keyboard the tree view jumps
• When switching IP Backbone to TP with IoT line inside Message is incomplete/missleading
• When using the expand button, the select focus partly changed
• Wrong Filter Table display in Device Info