Hi Wojtek
OK We did the whole check you have suggested and nothing abnormal has been found. After that I tested again the system and got the same "no new data to download"
Growing tired of all this mess I tried a last procedure before throwing everything against the wall : checking the firmware versions of WLIP data loggers and consoles.
one console 6250 EU (MFG Code Axxxxxx)
one console 6250 US (MFG Code Axxxxxx)
WLIP data logger (8 years old) with the 6250 EU Console
WLIP data logger (brand new) with the 6250 IS Console
Downgrading of Console firmware from 4.30 to 3.0WLIP data logger firmware 1.12
Weatherlink 6.04
And it works fine !These consoles do not accept firmware above 3.0
To your knowledge is there any warning from Davis Instruments about this problem ?
If yes I am afraid I missed it and it's a good occasion for self flagellation
If no it's regrettable
Thank you Wojtek and many thanks also to Johnd for your kind help and supportI didn't know this forum before this problem but now I am a strong supporter and will often come back. It's a kind of gold mine for met amateurs !
By the way is there a Forum procedure to mention this case closed ?