Vaisala WMT52 Manuel d'utilisateur télécharger pdf (Page 81)

Chapter 7 __________________________________________________ Getting the Data Messages

VAISALA_______________________________________________________________________ 79

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<cr><lf> (measurement ready in 3 seconds and 6

parameters available)

0<cr><lf> (measurement completed)

0D0!0+339+018+030+0.1+0.1+0.1<cr><lf>

<cr><lf> = Response terminator

NOTE

aD0 command can also be used to break the measurement in progress

started with commands aM, aMC, aC or aCC.

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 messages is as follows:

Wind (M1): Dn Dm Dx Sn Sm Sx

Supv (M5): Th Vh Vs Vr Id

Comp (M): Wind Supv (parameters in above order)

The parameters are in the same order as in the Setting Field tables in

chapter Sensor and Data Message Settings on page 95. The order of the

parameters is fixed, but you can exclude any parameter from the list

when configuring the sensor.

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Vaisala WMT52 Manuel d'utilisateur Page 81