Vaisala WXT510 - Manual (Page 135)

Appendix A ______________________________________________________________ Networking
VAISALA ______________________________________________________________________ 133
Communication Protocol
Set the communication protocol to ASCII polled (with or without CRC)
or NMEA query. When using NMEA query, the wind message should
be set to XDR (aWU,N=T).
ASCII, Polled
WXT510s on the bus shall be assigned with different addresses. (for
example: aXU,A=0,1,2, ... ).
Example (a bus with three WXT510s):
WXT510 #1 communication settings:
0XU,A=0,M=P,C=3,I=0,B=19200,D=8,P=N,S=1,L=25
WXT510 #2 communication settings:
1XU,A=1,M=P,C=3,I=0,B=19200,D=8,P=N,S=1,L=25
WXT510 #3 communication settings:
2XU,A=2,M=P,C=3,I=0,B=19200,D=8,P=N,S=1,L=25
Example (composite data message queries to the sensors 1 and 3 are
assigned as follows):
0R0<cr><lf>
1R0<cr><lf>
2R0<cr><lf>
NMEA 0183 v3.0, Query
The NMEA 0183 query messages do not contain device address
information. Individual query commands can thus not be directed to
different transmitters. Instead, a specific Time Slot method can be used
NOTE No matter which communication protocol, ASCII polled or NMEA
query is chosen, the error messaging parameter of the supervisor
message must be disactivated with aSU,S=N for each WXT510 on the
bus in order to prevent the units responding to the commands not
assigned to them.