DAVIS GroWeatherLink Software - Manual (Page 105)

T E C H N I C A L R E F E R E N C E
Modem String
98
Database Files
The software stores downloaded data in monthly files. Whenever you download,
the software saves database files into the open station's directory. The file name
which the software applies to database files indicates the year and month of the
data. The three character file extension indicates the station from which they were
downloaded. You must make sure that the file extension for the database files
matches the first three letters or numbers in the directory name (ignore any punc-
tuation). For example, the database file for April,1994 from a directory called
\HOME (and a station called Home) would be named 1994-04.HOM.
Completely filled database files (that is, containing every possible record for a
month) saving data stored at the 30 minute archive interval will occupy approxi-
mately 64K of disk space. The file size changes in a linear fashion depending on
the archive interval. For example, a completely filled file containing data stored at
an interval of 1 minute will occupy approximately 1.92 MB of disk space while the
same file containing data stored at an interval of 2 hours will occupy approxi-
mately 16K.
You cannot combine database files. For example, if you download half of your
April data to one directory and the other half to another directory, you cannot
combine the two database files into a single file containing all of your April data.
Take extreme care when downloading to make sure the correct station is the open
station.
Note: If you do not clear your archive memory, you may be able to download the data into the cor-
rect file at a later date.
M O D E M S T R I N G
The software automatically enters the following modem initialization string,
which should work with most Hayes compatible modems: AT E &M Q V X4
S7=60. The individual components of the string have the following meaning.
▲ AT
This string precedes all Hayes commands.
▲ E
Turns echo off.
▲ &M
Selects asynchronous operation which disables error checking and speed buff-
ering in more sophisticated modems.
▲ Q
Tells the modem to return result codes.
▲ V
Tells the modem to return short form result codes.
▲ X4
Enables result codes 0-7 and 10.
▲ S7=60
Tells modem to wait a maximum of 60 seconds for remote modem to answer
and issue a data carrier.