Vaisala WMT52 - Manual (Page 89)

Chapter 7 __________________________________________________ Getting the Data Messages
VAISALA_______________________________________________________________________ 87
The checksum to be typed in the query depends on the device identifier
characters and can be asked from WMT52, see example below.
Example:
Typing the command $--WIQ,XDRxxx<cr><lf> (xxx arbitrary
characters) WMT52 responds
$WITXT,01,01,08,Use chksum 2D*72<cr><lf>
indicating that 2D is the correct checksum for the $--WIQ,XDR
command.
If there are several distinct measurements of the same parameter
(according to the transducer table below), they are assigned with
different transducer ids. For example, minimum, average and maximum
wind speed are measurements of the same parameter (wind speed) so if
all three are configured to be shown in the XDR message, they get
transducer ids A, A+1 and A+2, respectively, where A is WMT52
address aXU,A. The same applies for the wind direction.
For example, for a WMT52 with device address 0 the transducer ids of
all the measurement parameters are as follows:
Example of the XDR Query (all parameters of each sensor enabled
and NMEA wind formatter set to T):
$--WIQ,XDR*2D<cr><lf>
Example of the response when all the parameters of each sensor are
enabled (NMEA wind formatter set to T):
Table 7 Transducer IDs of the Measurement Parameters
Measurement Transducer ID
Wind direction min 0
Wind direction average 1
Wind direction max 2
Wind speed min 0
Wind speed average 1
Wind speed max 2
Heating temperature 2
Supply voltage 0
Heating voltage 1
3.5 V reference voltage 2
Information field 4