KNX - How to display DataPointTypes correct in OpenHab

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1

Hi Everybody

The Basic functionality (switches) with openhab works fine and I’m impressed by the simplicity of the configuration (until now :slight_smile). I’m using the 1.8.1 (and checked the change log for 1.8.2 about DataPointType issues etc.).

I’m trying to display values from the KNX Bus in Opemhab.
To verify the displayed values, I have a ProServ running in parallel (and of course the ETS5 Monitors).
I tried to get proper results with different DataPointTypes without luck :sweat: This implies i have missed something fundamental.

Here the sample:

ETS5 Monitor:
RawData «29 00 BC E0 11 46 01 F3 05 00 40 3E 9C D1 75»
DataPointType «14.019»
DecodedDpValue «3E 9C D1 75 | 0.3062855»
RawDpValue «3E 9C D1 75»

Correct display on ProServ:
«0.3062855 A»

BUT
Incorrect display on Openhab:
«2165.7600 A»

Here the extract of «default.items» regarding the 0/1/243:
Number Bus_A “KNX Bus [%f A]” (Energie) {knx = “<0/1/243”}

As this is a rainy Sunday, does is anybody has a hint, what i have to check, change or add :wink:
Please tell me if i have to post additional files (or extracts).

A generic procedure will also be fine for me (and all other beginners)…
Thank you so much for all the support…

KR

2

Did you try to set the dpt?

Number Bus_A "KNX Bus [%f A]" (Energie) {knx = "<14.019:0/1/243"}
1 Like
3

Thank you Udo!
It works perfect by adding the DataPointType before the «Gruppenadresse». :smile:
But what shall be used for a «14.* 4-Byte Gleitkommawert» in the «default.items» (i.e. if the units proposed by the ETS5 do not fit {e.g. [dl/h]})?
KR Urs

4

As far as I know, the minor DPT isn’t that important for correct data, as the units do no exist in openHAB at all. The main thing is to set the correct major DPT.

5

It seems that not every DPT available in ETS5 works with openhab 1.8.1.
As it is unpredictable which DTP works I use «.001» (e.g. 14.001) as a workaround.
Thank you for your Support Udo. It solved my issue!

Urs