Troubleshooting guide

Archive download errors
Symptom: Real-time data is passing successfully from logger to computer, but attempts to download
archive data are failing, either partially or completely.
Background: Davis loggers can all generate two quite distinct types of data: real-time data (sometimes
called Loop data) and archive data. Real-time data is passed to the computer about every 2-3 seconds and
is the data source for the Bulletin mode of the Weatherlink software, ie the real-time display that shows, for
example, live wind data. Archive data is the summary data which the logger generates at preset intervals
(typically every 5 to 30 minutes according to the user settings) and which accumulates within the logger until
a computer is connected and an archive download is requested.
Archive download issues are seen most often with the Weatherlink software, for the simple reason that most
third-party programs use only the real-time data as their primary data feed, although some do also have a
‘catch-up’ mode which makes use of archive data. (Using only real-time data means of course that the
connected computer must be switched on 24/7 if data is not to be lost, which is a significant drawback for
many users and is one one the main reasons why the Weatherlink program remains so popular.)
This topic covers only errors seen with archive downloads. It assumes that real-time data is being passed
successfully to the computer; if this is not the case then go back and review the general Weatherlink logger
topic,. The troubleshooting notes below assume that you know what the terms ‘archive database’ and
‘Browse mode’ mean in the context of the Weatherlink program. If not then please refresh your memory from
the Help within the Weatherlink software.
Types of archive download error:
There are, broadly, three main types of error that can be encountered with archive downloads:
• ‘No new data to download’: Attempts to download archive data always give this same error
message;
The logger will always report that there is no new archive data to download if insufficient time
has been allowed for the first new record to be saved. So if testing the logger with the interval
set e.g. to 30 minutes but without waiting at least 30 mins before downloading then the WL
program will be perfectly correct in reporting that no new archive data is available.
Prodata Weather Systems Davis Weather Stations KB - Prodata Weather Systems - 1
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