Davis Instruments GroWeatherLink, User Manual, Page: 103 / 108

T
E C H N I C A L R E F E R E N C E
Automatic Download
96
The weather station actually reads atmospheric pressure not barometric pressure.
When you set the barometric pressure from the station, the station automatically
calculates the difference between the barometric pressure you enter and the atmo-
spheric pressure it reads. This difference gets stored as the barometric pressure
calibration number. When displaying the barometric pressure, the station reads
atmospheric pressure and adds the calibration number to determine barometric
pressure.
When you enter barometric pressure from the software, the software calculates
the calibration number and stores it in the weather station’s memory (in the same
way it would if you set the barometer from the station) and in the open station’s
configuration file. In this case, both the software and station “agree” on the baro-
metric pressure calibration number.
If you enter a new barometric pressure from the weather station, nothing gets
stored in the station’s configuration file. The calibration number in the software
now differs from the calibration number in the station, and your readings and
database will be incorrect.
Note: The software does not support wind speed calibration numbers.
A
U T O M A T I C
D
O W N L O A D
The automatic download feature allows you to specify the times at which you
wish the WeatherLink Software to download data every day. At the specified
time, the software will prompt you to indicate whether or not you wish to down-
load data. You may choose OK to continue or Cancel to quit the download. If you
do not make a choice within 10 seconds (if your computer is unattended, for
example) the software automatically downloads data.
In order for the software to perform the automatic download at the specified time,
the computer must be on and the software must be running. If you have a remote
connection, the software automatically dials and hangs up the connection for you.
An entry is made in the log file (see “View Log” on page 28) to indicate whether
the automatic download was successful.
Note:
The automatic download procedure is disabled if you are actually connected to a remote sta-
tion at the automatic download time.
Under certain circumstances, the software will actually download data if the cur-
rent time is less than 10 minutes beyond the automatic download time. This fea-
ture allows the software to automatically download data from a station if you
launch the software a little later than the automatic download time or if a previ-
ously executed automatic download continues past the automatic download time
of another station. For example, station 1 is set to download at 12:00 and station 2
is set to download at 12:01. Because the archive memory on station 1 is almost
full, it takes until 12:02 before the automatic download of station 1 is completed.
Station 2 will still automatically download despite the fact that its automatic
download time of 12:01 has already passed.