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101

Virtual Weather Station User's Guide

-98- 03/07/06

10.1 Advanced Communication Troubleshooting

Tips for Oregon Scientific Weather Stations

If you followed the troubleshooting tips above and could

not find a solution, you likely have a problem with your

station's communication port, the cable or your computer.

To verify that you are receiving data, launch Hyper

Terminal, which is a terminal emulation program

distributed with most Windows operating systems.

ü Launch Hyper Terminal, Select

[Start][Programs][Accessories][Hyper

Terminal] from your Windows Desktop.

ü Run Hyper Terminal by selecting the Hypertrm

icon.

ü Enter a Name (any name is OK) for the

connection description.

ü Select Connect Using and Direct to Com x,

where x is the comport designation.

ü Select 9600 baud, 8 data bits, Parity None, 1 stop

bit, Flow Control Hardware Control.

ü You should see binary data on the display every

time your station sends data (example, !¤ P

33¼Pyü).

ü If you see data streaming on the display, contact

Ambient, LLC ([email protected]).

ü If you do not see data streaming on the display,

please contact Oregon Scientific, your PC

Manufacturer, or the cable manufacturer.

11 Glossary of Terms

The following is a glossary of weather and instrument terms.

Term Definition

AIR DENSITY The ratio of the mass of a substance to the volume it occupies. In oceanography, it is

equivalent to specific gravity and represents the ratio of the weight of a given volume of

sea water to that of an equal volume of distilled water at 4.0 degrees Celsius or 39.2

degrees Fahrenheit.

ATMOSPHERIC PRESSURE See barometric pressure

BAROMETRIC PRESSURE

The pressure exerted by the atmosphere as a consequence of gravitational attraction

exerted upon the "column" of air lying directly above the point in question. The

measurement can be expressed in several ways. One is in millibars. Another is in inches or

millimeters of mercury (Hg). Also known as atmospheric pressure.

BEAUFORT WIND SCALE

A system of estimating and reporting wind speeds. It is based on the Beaufort Force or

Number, which is composed of the wind speed, a descriptive term, and the visible effects

upon land objects and/or sea surfaces. The scale was devised by Sir Francis Beaufort

(1777-1857), hydrographer to the British Royal Navy.

CALIBRATION ERROR The inaccuracy that the manufacturer permits when the unit is calibrated in the factory.

CLOUD BASE For a given cloud or cloud layer. The lowest level in the atmosphere at which the air

contains a perceptible quantity of cloud particles. Virtual Weather Station estimates the

cloud base on temperature and humidity readings, using the following equation:

Cloud Base (ft) = 250(Temperature - Dew Point)

COOLING DEGREE DAY A cooling degree day is given for each degree that the daily mean temperature departs

above the baseline of 75 degrees a given temperature It is used to estimate the energy

requirements, and is an indication of fuel consumption for air conditioning or

refrigeration. Refer to degree day or heating degree day.

DEW POINT The temperature to which a sample of air must be cooled, while the mixing ratio and

barometric pressure remain constant, in order to attain saturation by water vapor. When

this temperature is below O°C, it is sometimes called the frost point.

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