metern value go to zero

[f.volpato]

Hi to all!
in my metern system whit raspberry and modbus power meter type SDM120 the readings on the chart often mark the value zero, See the image to link http://www.b12web.it/loggyb/adv/metern.png.

Someone tell me why?

Thanks,
F.

[jeanmarc]

Because there is no difference between your 5' samples

[f.volpato]

Thanks!
I understand, but you can avoid it will be represented in this way?

Thanks,
P.

[jeanmarc]

How would you represent a meter that doesn't increase ?
The same thing happen before 6AM on your example, that is the way it work. The problem is from your com app, not from meterN.
What do you use to read your SDM ?

[f.volpato]

To read the sdm use a USB - RS485 converter mounted on a raspberry . I wish that peak down does not have displayed . I wish it were a uniform look .
It's possible?

[jeanmarc]

Please, past your csv values where it happen. If you directly request sdm120c, then i bet it miss a value.