Link’nX KNX functions: troubleshooting and frequently asked questions

Equipment that does not react, hysteresis output not repeated, timer that does not end, save rejected or function missing: here are the answers to the most common problems with Link’nX functions, for administrators and installers. Always start by checking the project and the gateway displayed.

Do I need to add my function to a scenario?

No. A configured and enabled function directly commands its KNX target according to its settings. To find it and check its state, follow the functions guide.

Why does my equipment not react when the demo works?

Play demo and moving the marker in the hysteresis preview are simulations: they send no KNX command. Then check:

• that the function was saved and that its card shows Enabled;
• that the source, the target and their DPTs match the known parameters of the installation.

Do not change a value to try to cause a reaction whose effect you do not know. If the result is still missing after these checks, contact support.

Why is the hysteresis output not sent again at each measurement?

This is the expected behavior for a numeric source: the command is requested when entering a threshold zone. Successive measurements within the same zone do not repeat it, and the deadband requests no sending. The threshold rules detail this behavior. For a binary source or another situation not covered, contact support with the result you want.

Why does the timer not end although the room appears empty?

The function monitors telegrams, not room occupancy: a new write or response on any of the sources restarts the delay, even with the value zero. Check the addresses in Sources and their known use. If the chosen sources do match the objective, follow the timer guide, then report the symptom to support if the result remains unexpected.

Why doesn’t the preview show the same number as the delay field?

The units differ: the entry field is in minutes, the preview rule in milliseconds and the list card again in minutes. For example, 2 minutes correspond to 120,000 ms. If the conversion does not match your entry, contact support without repeating saves.

Why is saving the function rejected?

With Please fill in all required fields, check Function name, 80 characters maximum, then the settings of the type displayed:

• hysteresis: the addresses, the DPTs, the two output values and a low threshold strictly lower than the high threshold;
• presence detection: each source, the target, the DPT, the value and a positive duration.

The guide for each type explains the expected formats. If Error saving or Error updating persists, send the message to support.

Where can I find a function or all its sources?

Check the project and the gateway, then the two groups of the Function list. No function in this group yet. concerns one group; No function configured yet. concerns the whole list. To see all the sources of a presence function, open its Edit pencil. If the list remains unexpected, contact support before recreating a function.

Does disabling or deleting a function restore the previous state of the equipment?

No: these operations send no reverse command. To suspend a function while keeping its configuration, use Enable or disable function, wait for the confirmation and check its state. To restore a physical state whose procedure is not established in your context, contact support.

Contact support

If the problem persists after these checks, write to support@can-nx.com with: Link’nX — Functions, the project and the gateway, the name and type of the function, the state displayed, the symptom, any message and the tests already made. A screenshot without sensitive data can help. Never send a password or a secret.