Vaisala WINDCAP WS425 Guide de l'utilisateur télécharger pdf (Page 178)

User's Guide ______________________________________________________________________

SDI-12 Data Messages

When the SDI-12 profile is selected, the data message sent by

WMT700 depends on the command that you use before fetching

the data with the aD0! command.

WS425 A/B SDI-12 Message for C and M

Command

When you have given the commands aC! or aM! followed by

aD0!, the response is the following:

a<WS><WD><x><y><s><CR><LF>

where

Single-digit WMT700 address that corresponds to

the first character of the address value

<WS>

Polar wind speed in selected units

Format: +(ss)s.s

<WD>

Polar wind direction in degrees

Format: +(dd)d.d

<x>

x component of wind speed in selected units

Format: ±(ss)s.s

<y>

y component of wind speed in selected units

Format: ±(ss)s.s

<s>

Static speed of sound in miles per hour

Format: ±(ss)s.s

Terminates the response

The above are measurement data fields.

Missing Readings

If data is missing due to a measurement problem (for example,

blocked paths between transducers), the measurement data is

replaced with 999.9.

Example of the command and response when data is missing:

7D0!

7+999.9+999.9+999.9+999.9+999.9 <CR><LF>

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Vaisala WINDCAP WS425 Guide de l'utilisateur Page 178