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User’s Guide ______________________________________________________________________

82 ___________________________________________________________________M210925EN-B

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 95.

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 133.

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 sensor is connected to the bus, see Appendix A,

Networking, on page 121. If you need to change the device address, see

Changing the Communication Settings (aXU) on page 59.

where

? = Device address query command

<cr><lf> = Command terminator

where

b = Device address (default = 0)

<cr><lf> = Response terminator.

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Vaisala WINDCAP WMT52 Uživatelská příručka Strana 84