NMEA 0183 v 3.0 query with ASCII query commands - WXT530

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

 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:

1R<cr><lf>

$WIXDR,A,330,D,1,A,331,D,2,A,333,D,3,S,0.1,M,1,S,0.1,M,2,S,0.2, M,3*55<cr><lf>

$WIXDR,C,23.5,C,1,C,24.3,C,2,H,49.3,P,1,P,1010.1,H, 1*59<cr><lf>

$WIXDR,V,0.000,I,1,Z,0,s,1,R,0.00,I,1,V,0.0,M,2,Z,0,s,2,R,0.0,M, 2*67<cr><lf>

$WIXDR,C,25.8,C,3,U,10.6,N,1,U,10.9,V,1,U,3.362,V,2*78<cr><lf>

The query for WXT530 #3 and the response:

2R<cr><lf>

$WIXDR,A,341,D,2,A,347,D,3,A,357,D,4,S,0.1,M,2,S,0.2,M,3,S,0.2, M,4*53<cr><lf>

$WIXDR,C,23.5,C,2,C,24.3,C,3,H,49.3,P,2,P,1010.1,H, 2*5F<cr><lf>

$WIXDR,V,0.000,I,2,Z,0,s,2,R,0.00,I,2,V,0.0,M,3,Z,0,s,3,R,0.0,M, 3*61<cr><lf>

$WIXDR,C,25.8,C,4,U,10.6,N,2,U,10.9,V,2,U,3.360,V,3*7C<cr><lf>

If needed, for making the transducers IDs distinguishable, device addresses 0, 4, 8 can be used as described in the previous section.