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3.4 Measurement Methods
WMT700 measures wind speed and direction either continuously or for the duration of the
user-configurable averaging time. You can select the measurement mode over the serial
interface.
3.4.1 Continuous Measurement
You can set WMT700 to measure wind data continuously and stop the measurement with
the
STOP
command.
The following data communication methods are available:
• Poll Mode: You can fetch the most recent data from WMT700 with the
POLL
command.
You must specify the data message identification number in the command.
• Automatic Message Mode: If the automatic message interval is configured, WMT700
sends automatic data messages at selected intervals. The data message is user-
configurable.
More Information
‣
Serial Interface Timing (page 42)
3.4.2 Wind Measurement on Request
You can set WMT700 to measure wind speed and direction for a specified period of time.
The duration of the measurement can range from 0.25 seconds to 60 minutes, depending on
the configured averaging interval.
You can fetch the required data message from WMT700 in measurement mode with the
polling command. You must specify the data message in the command.
More Information
‣
Serial Interface Timing (page 42)
3.5 Host System Connections and
Interfaces
WMT700 always needs a host device for measurement data collection and presentation. The
host device is usually an automatic weather station, but other host devices such as data
loggers or personal computers can also be used.
WMT700 performs calculation, quality control, and data format procedures on the
measurement data. The processed data is sent to weather stations using serial ports and/or
analog output channels. The most commonly used communications interface is RS-485, but
WMT700 has a flexible set of interfaces ranging from RS-232 to voltage and current mode
analog signals.
WMT700 User Guide
M211095EN-H
38
Содержание WINDCAP WMT700 Series
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