Vaisala WXT520 - Manual (Page 156)

User’s Guide ______________________________________________________________________
154 _________________________________________________________________ M210906EN-C
$WIXDR,C,25.8,C,10,U,10.6,N,8,U,10.9,V,9,U,3.360,V,
10*7C<cr><lf>
Now the response messages of all three transmitters can be recognized
and parsed by the data logger.
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 shall be assigned with
different addresses (for example: aXU,A=0,1,2, ... ). The RS-485 line
delays are not needed.
Example (a bus with three WXT520s, data requests with combined
data message query commands; the same message parameter
configuration as in the previous example):
WXT520 #1 communication settings:
0XU,A=0,M=Q,C=3,I=0,B=4800,D=8,P=N,S=1,L=25
WXT520 #2 communication settings:
0XU,A=1,M=Q,C=3,I=0,B=4800,D=8,P=N,S=1,L=25
WXT520 #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 WXT520 #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>
NOTE WXT520 address may consist of letter characters but the transducer
IDs in the NMEA XDR messages can only be numbers. The addresses
given in letters will show in the transducer IDs in the following way:
WXT520 address = A => transducer ID = 10, B => 11, a => 36, b =>
37 etc.