Vaisala WMT700 - Manual (Page 133)

Chapter 5 _________________________________________________________________ Operation
WMT700 Data Message 24
WMT700 Data Message 24 reports wind measurement and self-
diagnostics data. The checksum is included in the message.
WMT700 calculates the checksum by applying 8-bit XOR for all
bytes between checksum calculation start point and end point.
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, maximum
\wm = Wind speed, minimum
\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 123
\se = Checksum calculation end point, not shown in the message
\sp = Print checksum (to verify message integrity)
\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
>
Interpretation of the example message:
- Wind speed, average: 3.45 m/s
- Wind direction, average: 76.03°
- Wind speed, maximum: 3.58 m/s
- Wind speed, minimum: 3.37 m/s
- Sonic temperature: 21.97 °C
- Heater voltage: 23.8 V
- Supply voltage: 23.6 V
- Transducer temperature: 23.8 °C
- Status code: 0
- Checksum: D4
VAISALA _______________________________________________________________________ 131