Vaisala WXT520 - Manual (Page 97)

Chapter 7 __________________________________________________ Getting the Data Messages
VAISALA_______________________________________________________________________ 95
Command format: $--WIQ,MWV*hh<cr><lf>
The response format:
$WIMWV,x.x,R,y.y,M,A*hh<cr><lf>
The checksum to be typed in the query depends on the device identifier
characters. The correct checksum can be asked from WXT520 by
typing any three characters after the $--WIQ,MWV command.
where
$
= Start of the message
-- = Device identifier of the requester
WI = Device type identifier (WI = weather instrument)
Q = Defines the message as Query
MWV = Wind speed and direction query command
* = Checksum delimiter
hh = Two-character checksum for the query command.
<cr><lf> = Command terminator
where
$
= Start of the message
WI = Talker identifier (WI = weather instrument)
MWV = Wind speed and direction response identifier
x.x =
Wind direction value
1
1. Wind direction is given in relation to the devices north-south axis. An
offset value to the measured direction can be set, see section Chapter 8,
section Wind Sensor.
R = Wind direction unit (R = relative)
y.y = Wind speed value
M = Wind speed unit (m/s)
A = Data status: A = valid, V = Invalid
* = Checksum delimiter
hh = Two-character checksum for the response
<cr><lf> = Response terminator