Vaisala WINDCAP WS425 User's Guide download pdf (Page 99)

Chapter 7 ________________________________________________________________ Operation

VAISALA _______________________________________________________________________ 97

WMT700 Data Message 24

WMT700 Data Message 24 reports wind measurement and self-

diagnostics data. The check sum is included in the message. WMT700

calculates the checksum by applying 8-bit XOR for all bytes. The result

is printed as a 2-digit hexadecimal value. The message is in the format

described below:

\ss$\ws,\wd,\wp,\wm,\Ts,\vh,\vi,\ta,\er,\se\sp\cr\lf

where

\ss = Checksum calculation start point, not shown in the

message

$ = Fixed text

\ws = Wind speed, average

\wd = Wind direction, average

\wp = Wind speed, peak

\wm = Wind speed maximum

\Ts = Sonic temperature

\vh = Heater voltage

\vi = Supply voltage

\ta = Transducer temperature

\er = Status code. The code is a decimal number. Each bit

corresponds to a status flag. For a list of the bits, see

section Status Flags on page 86.

\se = Checksum calculation end point, not shown in the

message

\sp = Print checksum

\cr = CR (carriage return)

\lf = LF (line feed)

Example:

$03.45,76.03,03.58,03.37,21.97,23.8,23.6,23.8,0,D4<cr><lf>

Interpretation of the example message:

- Wind speed, average: 3.45 m/s

- Wind direction, average: 76.03 °

- Wind speed, peak: 3.58 m/s

- Wind speed, maximum: 3.37 m/s

- Sonic temperature: 21.97 °C

- Heater voltage: 23.8 V

- Supply voltage: 23.6 V

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Vaisala WINDCAP WS425 User's Guide Page 99