Lufft Ws600 UMB und ähnliche

[Stefan Schnidrig]

Hallo zusammen.

Kann mir jemand sagen, ob die Wetterstation der Firma LUFFT mit der RS485 Schnittstelle funktioniert mit Weewx?

Vielen Dank

[Stefan Schnidrig]

Hi Guys.
Can someone tell me whether the weewx system also supports the weather stations of the company LUFFT (www.lufft.com)? These are supplied with a Modbus and RS485 readout. I prefer the RS485, as it is easier. If this works, what do you need to set in weewx to be able to read the data? The picture of the sensor you see above in my post.

Many Thanks
Stefan

[Andrew B]

I was in the middle of writing a Lufft driver this weekend and the WS500 that I was using for testing died on me. This is the second sudden failure I've experienced with Lufft hardware over the past couple of months. So I think I'm going to investigate other hardware.

If anyone still wants to write a driver for Lufft hardware, this will save you a lot of time:

https://github.com/Tasm-Devil/lufft-python

[Stefan Schnidrig]

[Stefan Schnidrig]

Hello Andrew.
I have 3 air weather stations. Had also 2 hardware failures of the sensor WS600 UMB.
After a long discussion with the company Lufft you have now replaced me. 
I have now purchased 3 Lufft wind sensors (Ventus-X) as the weather stations are installed at a height of 2300 - 3500m. 
Was the pyton clean or were there failures? I will test this time and hope it works. That would be perfect. Thank you for your mail.
Greeting Stefan

Am Montag, 13. Mai 2019 06:44:48 UTC+2 schrieb Andrew B:

[Andrew B]

The code I linked to is a library/api that someone else wrote. I was using it to write a proper weewx driver. Unfortunately I didn't get too far before my sensor failed.

I really like Lufft hardware but this is the second time I've had a sensor fail. I think I'm going to give a Vaisala WXT536 a try.

[Stefan Schnidrig]

Do I understand that correctly, that one can read out with this .py file but the Ws500 and others?
That would be enough for me for the time being. At the moment it would be only for me to be able to read sensor with weewx. 
I always had meteohub until now. This supports the WS600 UMB and all their families.
Thank you

[Andrew B]

The python code I linked to earlier allows you to pull data from any Lufft UMB device. However, it does have the command class hardcoded to 7.

WSxxx (WS500, WS600, etc) = class 7

Ventus (Ventus X, etc) = class 8

You can change this on line 103 of WS_UMB.py. Just change the 7 to 8 for Ventus

Basically, if you're okay with raw JSON data, you can just use WS_UMB.py as-is aside from changing the class number (if needed). However, if you want to use a lufft device with weewx, you'll have to write a driver.

If I get another Lufft device in the future I'll look at finishing a driver. However, between the failures and the poor performance of their radar precipitation sensors, I just can't bring myself to toss more money their way right now.

For what it's worth, their wind sensors do seem to be rock solid. If I ever need to place a wind sensor in an extreme environment, I would definitely go for a ventus.

[Stefan Schnidrig]

Many thanks for the help. Now I have understood it too. Well then I'll start to write the read data in a table. Of course, if you let the WS600 UMB and its brother Ventus work with weewx, then that would be even better and more interesting. I have 3 Ventus and would have 1x WS700 UMB and a WS500 UMB, which I send back because they are not recommended in the field, so over 2000m in winter, since the wind measurement fails because the ultrasonic sensor fill with snow and the despite heating. Therefore the change to Ventus-X. Thank you for detail information.