Vaisala WINDCAP WS425 Guide de l'utilisateur télécharger pdf (Page 160)

User's Guide ______________________________________________________________________

WS425 A/B NMEA Extended Data

Message

WS425 A/B NMEA Extended data message is as follows:

$P<id>MWV,<dir>,<ref>,<spd>,<uni>,<sta>*<chk><CR><LF>

where

Fixed text

<id>

Data ID; A … Z

MWV

Fixed text

<dir>

Wind angle: 0 to 359 degrees

<ref>

Reference:

R = relative

<spd>

Wind speed

<uni>

Wind speed unit:

K = K

ilometers per hour

M = M

eters per second

N = Knots

<sta>

Status:

A = V

alid data

V = Invalid data

Fixed text

<chk>

Checksum (8-bit XOR, excluding $ and *)

<CR>

Carriage return code, ASCII 0DH

<LF>

Line feed code, ASCII 0AH

Missing Readings

If data is missing due to a measurement problem, the NMEA

messages show "V" in the status field. Wind speed and wind

direction fields are left empty.

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Vaisala WINDCAP WS425 Guide de l'utilisateur Page 160