Vaisala WINDCAP WMT52 Guía de usuario descargar pdf (Pagina 71)

Chapter 7 __________________________________________________ Getting the Data Messages

VAISALA_______________________________________________________________________ 69

Polling with CRC

Use the same data query commands as in the previous sections but type

the first letter of the command in lower case and add a correct three-

character CRC before the command terminator. The response contains

also a CRC. For more information about the CRC-computation see

Appendix C, CRC-16 Computation, on page 133.

Requesting a wind data message with a CRC:

Command format: ar1xxx<cr><lf>

Example of the response (the parameter set is configurable):

0r1,Dn=236D,Dm=283D,Dx=031D,Sn=0.0M,Sm=1.0M,Sx=2.2MLFj

where the three characters before <cr><lf> are the CRC for the

response.

Example of asking the CRC for the wind data message query ar1:

Command format: ar1yyy<cr><lf>

where

a = Device address

r1 = Wind message query command

xxx = Three-character CRC for ar1 command

<cr><lf> = Command terminator

NOTE

The correct CRC for each command can be requested by typing the

command with an arbitrary three-character CRC.

where

a = Device address

r1 = Wind message query command

yyy = Arbitrary three-character CRC

<cr><lf> = Command terminator

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Vaisala WINDCAP WMT52 Guía de usuario Pagina 71