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
<cr><lf>
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
To Next Page
Loading...
