Nmea 0183 V3.0 Query With Ascii Query Commands - Vaisala WXT530 Series User Manual

Now the response messages of all three transmitters can be recognized and parsed by the
data logger.
The transmitter address may consist of letter characters but the transducer IDs in the
NMEA XDR messages can only be numbers. The addresses given in letters show in the
transducer IDs in the following way: transmitter address = A => transducer ID = 10, B => 11,
a => 36, b => 37, and so on.
A.3.5 NMEA 0183 v3.0 Query with ASCII Query Commands
You can use ASCII query commands aR1, aR2, aR3, aR5, aR, aR0 and their CRC-versions
ar1, ar2, ar3, ar5, ar, and ar0 also in NMEA 0183 protocol. The responses to these
commands will be in standard NMEA 0183 format and the transmitters are assigned with
different addresses (for example: aXU,A=0,1,2,...). The RS-485 line delays are not
needed.
Example (a bus with three transmitters, data requests with combined data message query
commands; the same message parameter configuration as in the previous example):
WXT530 #1 communication settings:
0XU,A=0,M=Q,C=3,I=0,B=4800,D=8,P=N,S=1,L=25
WXT530 #2 communication settings:
0XU,A=1,M=Q,C=3,I=0,B=4800,D=8,P=N,S=1,L=25
WXT530 #3 communication settings:
0XU,A=2,M=Q,C=3,I=0,B=4800,D=8,P=N,S=1,L=25
The query for WXT530 #1 and the response:
0R<cr><lf>
$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>
The query for WXT530 #2 and the response:
sales@streamlinemeasurement.co.uk 01457-864334
Appendix A – Networking
www.streamlinemeasurement.co.uk
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