Vaisala WXT520 - Manual (Page 95)

Chapter 7 __________________________________________________ Getting the Data Messages
VAISALA_______________________________________________________________________ 93
NMEA 0183 V3.0 Protocol
This section presents the data query commands and data message
formats for the NMEA 0183 v3.0 query and automatic protocols.
For changing the message parameters, units and other settings, see
Chapter 8, Sensor and Data Message Settings, on page 107 .
A two-character checksum (CRC) field is transmitted in all data request
sentences. For definition of the CRC, see
Appendix C, CRC-16
Computation, on page 161 .
Device Address (?)
This command is used to query the address of the device on the bus.
Command format: ?<cr><lf>
The response:
b<cr><lf>
Example:
?<cr><lf>
0<cr><lf>
If more than one transmitter is connected to the bus, see Appendix A,
Networking, on page 149 . If you need to change the device address, see
Changing the Communication Settings (aXU) on page 63 .
where
?
= Device address query command
<cr><lf> = Command terminator
where
b
= Device address (default = 0)
<cr><lf> = Response terminator.