Vaisala WMT700 - Manual (Page 72)

TECHNICAL REFERENCE___________________________________________________________
70 __________________________________________________________________ M211097EN-C
SDI-12 Data Messages
When SDI-12 profile is selected, the data message sent by WMT700
depends on the command that you use before fetching the data with 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
a
= The 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
<CR><LF> = 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>