Chapter 7 ___________________________________________________ Retrieving Data Messages
VAISALA______________________________________________________________________ 113
NMEA 0183 V3.0 Protocol
This section lists 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 127.
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 199.
Device Address (?)
This command queries 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 187.
For information on changing the device address, see Changing the
Communication Settings (aXU) on page 81.
where
? = Device address query command
<cr><lf> = Command terminator
where
b = Device address (default = 0)
<cr><lf> = Response terminator.
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