Vaisala WXT520 Betriebsanweisung PDF herunterladen (Seite 79)

Chapter 7 __________________________________________________ Getting the Data Messages

VAISALA_______________________________________________________________________ 77

Example of the response (the parameters included can be chosen

from the full parameter set of the commands aR1, aR2, aR3 and

aR5):

0R0,Dx=005D,Sx=2.8M,Ta=23.0C,Ua=30.0P,Pa=1028.2H,

Rc=0.00M,Rd=10s,Th=23.6C<cr><lf>

For selecting the parameter set in the response message, see Chapter 8,

Sensor and Data Message Settings, on page 107.

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 161.

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.

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.

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Vaisala WXT520 Betriebsanweisung Seite 79