Vaisala WXT520 Guide de l'utilisateur télécharger pdf (Page 82)

User’s Guide ______________________________________________________________________

80 __________________________________________________________________ M210906EN-C

Example (the parameters included can be chosen from the full

parameter set of the commands aR1, aR2, aR3 and aR5):

0R0,Dx=005D,Sx=2.8M,Ta=23.0C,Ua=30.0P,Pa=1028.2H,

Hd=0.00M,Rd=10s,Th=23.6C<cr><lf>

For selecting the parameter set in the response message, see Chapter 8,

Sensor and Data Message Settings, on page 107.

Automatic composite data messaging is a concurrent, not an alternate

mode to either the polled or automatic modes.

SDI-12 Protocol

There are two different modes available for providing all the

functionality of the SDI-12 v1.3 standard.

The lowest power consumption is achieved with the Native SDI-12

mode (aXU,M=S), as it makes measurements and outputs data only

when requested. In this mode all the commands presented in this

chapter are available except those for the Continuous measurement.

In the Continuous mode (aXU,M=R) measurements are made at user-

configurable update intervals, see Chapter 8, Sensor and Data Message

Settings, on page 107. The data is outputted on request. In this mode all

the commands presented in this chapter are available.

For changing the message parameters, units and other settings, see

Chapter 8, Sensor and Data Message Settings, on page 107.

In the Native SDI-12 mode (aXU,M=S) the WXT520 is in idle state

most of the time (power consumption < 1 mW). More power is

consumed only during the measurements and data transmit requested by

the host device. Especially, the wind measurement typically consumes

60 mW average power (with 4 Hz sampling rate), throughout the

averaging period. In the Continuous mode (aXU=M,R) the power

consumption is determined by the internal update intervals of the

sensors and wind averaging time. These have certain limits, so very

long measurement intervals can not be achieved with this mode. Also

the power consumption between the measurements is about three times

that of the Native mode.

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Vaisala WXT520 Guide de l'utilisateur Page 82