How does Weewx collect data?

Let's take my setup as example.
I have a Davis Vantage Vue with a data logger 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.

In this case, 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 stated in the guide, `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 frequently data 
are read in loop mode?


Thanks

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