Vaisala WXT520 Guide de l'utilisateur télécharger pdf (Page 89)

Chapter 7 __________________________________________________ Getting the Data Messages

VAISALA_______________________________________________________________________ 87

In order to request the measured data, Send data command aD should

be used, see the following sections.

Send Data Command (aD)

This command is used to request the measured data from the device. See

Examples of aM, aC and aD Commands on page 88.

Command format: aDx!

The response:

a+<data fields><cr><lf>

NOTE

Start measurement command tells the number of parameters available.

However, the number of the parameters that can be included in a single

message depends on the number of characters in the data fields. If all

the parameters are not retrieved in a single response message, repeat

the Send data commands until all the data is obtained.

where

a = Device address

D = Send data command

x = The order of consecutive Send data commands.

Always, the first Send data command should be

addressed with x=0. If all the parameters are not

retrieved, the next Send data command is sent with

x=1 and so on. The maximum value for x is 9. See

Examples of aM, aC and aD Commands on page 88.

! = Command terminator

where

a = Device address

<data

fields>

= The measured parameters in selected units, separated

with '+' marks (or - marks in case of negative

parameter values).

<cr><lf> = Response terminator

1 2 ... 84 85 86 87 88 89 90 91 92 93 94 ... 170 171

Pas de commentaire

Vaisala WXT520 Guide de l'utilisateur Page 89