Vaisala WXT520 Guide de l'utilisateur télécharger pdf (Page 152)

User’s Guide ______________________________________________________________________

150 _________________________________________________________________ M210906EN-C

Communication Protocol

Set the communication protocol SDI-12 v 1.3 (aXU,C=1,M=S) or SDI-

12 v1.3 continuous (aXU,C=1,M=R).

WXT520s on the bus shall be assigned with different addresses (for

example: aXU,A=0,1,2, ... ). Thereafter WXT520s on the bus do not

respond to the commands not assigned to them nor to the data messages

sent by the other WXT520s.

Example (A bus with three WXT520s):

WXT520 #1 communication settings:

0XXU,A=0,M=S,C=1,B=1200,D=7,P=E,S=1, L=25

WXT520 #2 communication settings:

1XXU,A=1,M=S,C=1,B=1200,D=7,P=E,S=1, L=25

WXT520 #3 communication settings:

2XXU,A=2,M=S,C=1,B=1200,D=7,P=E,S=1, L=25

If simultaneous measurements of the different units are needed, Start

concurrent measurement commands aC and aCC should be use for all

devices. If the measurements are to be performed consecutively for only

one unit at time, in addition to these also Start measurement commands

aM and aMC can be used. Start continuous measurement commands

aR1, aR2, aR3, aR5, aR, aRC1, aRC2, aRC3, aRC5 and aRC

available only in SDI-12 continuous protocol (aXU,M=R) can be used

eiher for simultaneous measurements of the units or consecutive

measurements for one unit at time. See also SDI-12 Protocol on page

80.

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Vaisala WXT520 Guide de l'utilisateur Page 152