Hello,

I want to program an arduino to display on a sreen the voltage from two of my meters.

After a few investigation I saw I can call http://192.168.1.222/station_set$.js  (I did it from Postman so far), but my question is: 

is it safe for the meter beeing called every second to get the voltage value ? 

Thank you for your response!

Hello,

I am having some issues with the power grid voltage, sometime it is too high (> 250V).

I enabled the voltage notification from app, but there is a delay on receiving it (which is normal) and I need to keep an eye on the voltage real-time.

I implemented this morning the Modbus call, as you suggested, and set it to request data every 3sec. Works fine.

Thank you for your fast response!

Hi:

Could you let me know, why you need to request this js so frequently?

we do not recommend requesting it frequently, because it would occupy more time for the MCU to let it work as an HTTP server.
Honest speaking, the efficiency is not very high when this MCU works as an HTTP server.

If you need to get the data, there is a local API 

HTTP://ip/monitorjson

But we also do not recommend requesting this API more frequently (not less than 5s).

if you need to request the  data more frequently, the best option is to use the Modbus/TCP 

like this https://www.iammeter.com/newsshow/news-modbus-tcp-energy-meter

Could you please describe why you need to monitor the voltage in nearly real-time?
If this requirement is universal,maybe we could provide some easy software (by nodejs or python) to achieve such a task(request every second by modbus/tcp, provide a sound alarm when the reading is out of the threshold, also provide the hook function that let people do some further operation).