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
.
Содержание WXT520
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