WEATHERPAK
®
-2000 USER
MANUAL
Coastal Environmental Systems (206) 682-6048
- 22 -
Aloha Operation
If you pull down the “SAM Options” from the Main menu and select “Raw data”, something like the following line
of data will appear:
421, 0.9, 225, 1.0, 23.9, 1.0. 226, 23.9, 14,0, 1917, 999, 46, 2536
This is showing you exactly what the WEATHERPAK
is sending. Notice that most of these numbers are present
in the “Processed Sam Data” on the previous page. The difference is that there are no labels and there are some
additional numbers. Also, this raw data is in metric units (millibars, m/s, C), whereas the processed data is in
standard English units (inches, m.p.h., F.)
The first number is the unique ID number (Serial #) of your WEATHERPAK
. If you do not have a
WEATHERPAK
display screen, then this is how to identify your WEATHERPAK
. If you have a
WEATHERPAK
display screen, the ID number appears on it.
Two “checksums” are performed to ensure that the message sent was correct. The computer adds up the “ASCII
value” of the data line (each letter and number and comma, etc., has a numerical value universal to all computers)
to make sure that the computer got the same number that the WEATHERPAK
transmitted.
Data line interpretation
The data line fields are as follows:
ID, MW, MD, ST, AT, SI, DI, TI, BV, CKSUM1, BP, RH CKSUM2
ID
– WEATHERPAK
identification number
MW
– 5 minute averaged wind speed in meters per second
MD
– 5 minute averaged wind direction in degrees
ST
– Stability class in degrees
AT
– 5 minute averaged air temperature in degrees Centigrade
SI
– Instantaneous wind speed in meters per second
DI
– Instantaneous wind direction in degrees
TI
– Instantaneous air temperature in degrees Centigrade
BV
– Battery voltage in volts
CKSUM1
– First checksum
BP
– Barometric pressure in millibars
RH
– Relative humidity in percent
CKSUM2
– Second checksum