I have no WLL experience so short answer is I don’t know. 

But the loop_request setting is a vantage driver setting, as far as I know 
you need to use a different driver for WLL. Also, there are a number of WLL 
drivers; looking at one just now I see it appears to emit pressure and 
altimeter, though as I said I don’t know enough about WLL to draw any 
conclusions.

Gary
On Wednesday, 13 January 2021 at 07:22:28 UTC+10 galfert wrote:

> Gary,
> That is very interesting and possibly important information. Is what you 
> mention dependent on the type of logger used? Meaning is the data switching 
> (LOOP1 / LOOP2) still an issue with the WLL?
>  
>
> On Tuesday, January 12, 2021 at 4:14:00 PM UTC-5 gjr80 wrote:
>
>> Assuming can be a dangerous business! If you have not specified anything 
>> for loop_request then you will be using LOOP1 only (the default), whether 
>> that is the ‘best available format’ depends on your circumstances I guess. 
>> Should you happen to specify loop_request = 3 in order to get the best of 
>> both worlds (by alternating between LOOP1 and LOOP2 packets) be aware that 
>> this can cause WeeWX loop packets to alternate between hardware provided 
>> and software calculated values for station pressure and altimeter (and 
>> archive records will then have a blend of both). If you do use loop_request 
>> I suggest you carefully read the loop_request stanza 
>> <http://weewx.com/docs/usersguide.htm#%5BVantage%5D> in the User’s Guide.
>>
>> Gary
>>
>>
>> On Wednesday, 13 January 2021 at 06:12:20 UTC+10 [email protected] wrote:
>>
>>>
>>> > If you don't have the latest firmware then you may not have Loop2 
>>> data. Not 
>>> > having Loop2 data will inhibit greater Altimeter calculation by WeeWX 
>>> > because station pressure will be missing and it will have to work 
>>> backwards 
>>> > and that is less accurate. Better to send the software station 
>>> pressure 
>>> > which is done by having Loop2 data. 
>>>
>>> According to the Davis site the latest firmward for the Vantage Pro2 is 
>>> 3.15 and wee_device reports my console is at 3.15. I have not specified 
>>> which LOOP data WeeWX is to use as I assume it is coded to use the best 
>>> available format. 
>>>
>>

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