When the XDR query command $--WIQ,XDR*2D<cr><lf> is sent, W
XT530 #1 responds
after 25 ms, WXT530 #2 after 1000 ms, and WXT530 #3 responds after 2000 ms. The
sucient delays depend on the maximum number of characters in the response messages
and the baud rate. Note that all the transmitters are assigned with the same address. The
data logger, after sending the query, sorts out the response messages on the basis of the
individual response times.
To gain even more addressability transducer ID information provided in the XDR response
messages can also be used. If WXT530 address is set to 0 (aXU,A=0) and all parameters are
chosen except Rain peak intensity and Hail peak intensity in the precipitation message, the
response to the XDR query $--WIQ,XDR*2D<cr><lf> is:
$WIXDR,A,316,D,0,A,326,D,1,A,330,D,2,S,0.1,M,0,S,0.1,M,1,S,0.1, M,2*57<cr><lf>
$WIXDR,C,24.0,C,0,C,25.2,C,1,H,47.4,P,0,P,1010.1,H, 0*54<cr><lf>
$WIXDR,V,0.000,I,0,Z,10,s,0,R,0.01,I,0,V,0.0,M,1,Z,0,s,1,R,0.0,M, 1*51<cr><lf>
$WIXDR,C,25.8,C,2,U,10.7,N,0,U,10.9,V,1,U,3.360,V,2*7D<cr><lf>
For the transducer IDs, see 7.4 NMEA 0183 v3.0 Protocol (page 102).
The maximum transducer ID is three when the transmitter address is 0. Assigning address 4
for the second and address 8 for the third transmitter on the bus the following responses to
the XDR query $--WIQ,XDR*2D<cr><lf> will be obtained from these transmitters (same
message parameter configuration):
The second transmitter (address 4):
$WIXDR,A,330,D,4,A,331,D,5,A,333,D,6,S,0.1,M,4,S,0.1,M,5,S,0.2, M,6*55<cr><lf>
$WIXDR,C,23.5,C,4,C,24.3,C,4,H,49.3,P,4,P,1010.1,H, 3*59<cr><lf>
$WIXDR,V,0.000,I,4,Z,0,s,4,R,0.00,I,4,V,0.0,M,5,Z,0,s,5,R,0.0,M, 5*67<cr><lf>
$WIXDR,C,25.8,C,6,U,10.6,N,4,U,10.9,V,5,U,3.362,V,6*78<cr><lf>
The thir
d transmitter (address 8):
$WIXDR,A,341,D,8,A,347,D,9,A,357,D,10,S,0.1,M,8,S,0.2,M,9,S,0.2,M,10*53<cr><lf>
$WIXDR,C,23.5,C,8,C,24.3,C,9,H,49.3,P,8,P,1010.1,H, 8*5F<cr><lf>
$WIXDR,V,0.000,I,8,Z,0,s,8,R,0.00,I,8,V,0.0,M,9,Z,0,s,9,R,0.0,M, 9*61<cr><lf>
$WIXDR,C,25.8,C,10,U,10.6,N,8,U,10.9,V,9,U,3.360,V, 10*7C<cr><lf>
WXT530 Series User Guide M211840EN-D
174
sales@streamlinemeasurement.co.uk
www.streamlinemeasurement.co.uk
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