Slider for KNX-Dali dimmer jumps at first always to 100%

[alex_knx (alex)]

If i use the slider for an KNX-Dali dimmer, the slider jumps at first always on 100%. This is regardless of which value i choose for the dimmer.
In the events.log, i could trace the problem so far, that i can see, that the dimmer item at first becomes the right value (line 1-5 in the events.log), but immediately also the switch switches to “ON” and the slider jumps to 100% (last line of the events.log).

here is the events log:

2021-02-24 00:42:25.382 [INFO ] [openhab.event.ItemCommandEvent      ] - Item 'Licht_WoZi' received command 53
2021-02-24 00:42:25.397 [INFO ] [penhab.event.ItemStatePredictedEvent] - Item 'Licht_WoZi' predicted to become 53
2021-02-24 00:42:25.426 [INFO ] [openhab.event.ItemStateEvent        ] - Item 'Licht_WoZi' updated to 53
2021-02-24 00:42:25.430 [INFO ] [openhab.event.ItemStateChangedEvent ] - Item 'Licht_WoZi' changed from NULL to 53
2021-02-24 00:42:25.571 [INFO ] [openhab.event.ItemStateEvent        ] - Item 'Licht_WoZi' updated to 53
2021-02-24 00:42:25.601 [INFO ] [openhab.event.ItemStateEvent        ] - Item 'Licht_WoZi' updated to ON
2021-02-24 00:42:25.609 [INFO ] [openhab.event.ItemStateChangedEvent ] - Item 'Licht_WoZi' changed from 53 to 100

It seems to be a OH problem, because the state ot the dimmer position is right, but the slider shows 100%. Also the value in the KNX is right (53%).
If I use the slider again, the it shows the right value. But I have no idea, why the switch switches to “ON”, or how to solve the problem.

I guess, i have the problem since i installed OH3 (from OH2.5 before), but i’m not sure.

the dimmer item:

Dimmer Licht_WoZi  "Licht_WoZi_Decke_Innen_Dimmer [%d %%]"    { channel="knx:device:knx-ip-gateway:knx:Licht_WoZi" }

and the dimmer thing:

Type dimmer 	: Licht_WoZi  "Licht_WoZi" 		[ switch ="1/3/80+<1/3/83", position="1/3/82+<1/3/84", increaseDecrease="1/3/81" ]

and the Sitemap:

Slider item=Licht_WoZi  

[rossko57]

See in particular “Jitter”

Autoupdate - a primer

I’ve found myself having to investigate and/or explain some of the features of autoupdate over time, and thought an in-depth view would be helpful. These notes apply to openHAB version 2.5 Overview Autoupdate is primarily a “speed up” feature for openHAB Items. Mostly we can ignore it, but sometimes you may get an unwanted or unexpected effect, or you may wish to exercise more control. To fully understand autoupdate, we must understand the difference between command and state of Items. If w…

but I think in this case the ON that gives the effect of 100% is coming from here
[ switch ="1/3/80+<1/3/83",
i.e.dimmer reports ON and binding converts to 100%.
Try it with
[ switch ="1/3/80",
so that you rely on dimmer numeric position reports only.

[alex_knx (alex)]

good idea.
And yes. it works.

But is it just a singularly problem in my case? Or does somebody else has these problem too? especially in connection to KNX?

[rossko57]

@alex_knx

But is it just a singularly problem in my case?

I think it’s a peculiarity of (some?) KNX dimmers to send separate report of on/off and %.

@alex_knx

Or does somebody else has these problem too?

Sure.

KNX dimmer and switch issue; strange behaviour

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KNX Dimmer problem with Openhab 2.3

Hi, i just switched to openhab 2.3 and I’m facing a problem with Dimmers. I have a KNX compliant Vimar ByMe system that I can interface with through a USB dongle by Busware. The dimmer supports the Switch on/off, Percentage set and Increase/Decrease, and everything works almost perfectly well with an exception. The Dimmer will publish the percentage it is at when increasing and decreasing but not when switching ON and OFF. (I sniffed the bus to find out the correct GAs) So when I switch ON …

[murmeldeier (Samuel Parmentier)]

I confirm I had the same (or similar) problem (and I am still on OH 2.x as I do not dare updating) and the solution suggested by rossko57 worked fine; the only thing I lost is a real time update of the slider when I move it (I need to wait a fraction of a second till I see the effective percentage).

[rossko57]

@murmeldeier

the only thing I lost is a real time update of the slider

You might get better visuals with autoupdate enabled. But there will be a trade off against possible “jitter” when using ON/OFF instead.