Vaisala WXT510 - Manual (Page 77)

Chapter 7 __________________________________________________ Getting the Data Messages
VAISALA _______________________________________________________________________ 75
Examples of aM, aC and aD
Commands
The device address is 0 in all examples.
Example 1:
Start a wind measurement and request the data (all six wind parameters
are enabled in the message):
0M1!00036 (measurement ready in 3 seconds and 6
parameters available)
0 (measurement completed)
0D0!0+339+018+030+0.1+0.1+0.1
Example 2:
Start a concurrent pressure, humidity and temperature measurement and
request the data:
0C2!000503 (measurement ready in 5 seconds and 3
parameters available, for aC command device address not sent as a sign
of a completed measurement)
0D0!0+23.6+29.5+1009.5
NOTE In SDI-12 v1.3 Continuous measurement mode (aXU,M=R) the
sensor makes measurements at configurable update intervals. The aD
command following the aM, aMC, aC or aCC command always
returns the latest updated data. Thus in aXU,M=R mode issuing
consecutive aD commands may result in different data strings if the
value(s) happen to be updated between the commands.
NOTE The parameter order in the wind, precipitation and supervisor data
messages are as presented in the parameter selection setting field, see
Chapter 8, Sensor and Data Message Settings, on page 93 .The
parameter order of the temperature, humidity and pressure data
messages are as follows: air temperature, internal temperature, relative
humidity and air pressure. For all sensors check also the bit tables in
the parameter selection fields to see the activated parameters.