How does Weewx collect data?

Let's take my setup as example.
I have a Davis Vantage Vue with a data logger, and it is configured to 
store data every 1 minute.
In my Weewx configuration, the `loop_request` param in the `[Vantage]` 
section is set to 3, and the `archive_interval` in the `[StdArchive]` 
section is set to 300.

If I am correct the `archive_interval` value is ignored, since I have my 
own configured in my data logger.

But what about the loop mode? As the guide states `WeeWX will then start 
monitoring live sensor data (also referrred to as 'LOOP' data)`: so the 
data in the data logger are ignored?
Currently, in my setup, Weewx is storing data in my database every 1 minute 
and for sure this value comes from the data logger, since I didn't setup it 
in weewx.conf.


So:
- is my weewx storing data every 1 minute, because such data are fetched 
from data logger (which is configured to store data every 1 minute)?
- if true, what's the point of loop mode? how is it used by weewx?
- if false, why is weewx storing data every 1 minute? how frequent data are 
read in loop mode?


Thanks

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