Vaisala WMT700 - Manual (Page 136)

User's Guide ______________________________________________________________________
Error Indication
WMT700 provides advanced self-diagnostics for monitoring the
status of the wind sensor and the validity of the measurement
data. You can use the diagnostics as follows:
- WMT700 checks the status of the internal operational software
at each reset by verifying the CRC checksum of the software.
The software check is not made periodically; it is only made at
each reset. If the checksum is incorrect, WMT700 does not
start up. If the checksum is correct, WMT700 continues by
calculating the CRC checksum of the parameter memory. In
case the parameter memory is corrupted, the sensor replies
with the text "Parameters crc error" upon startup. In case the
parameter memory checksum is correct, WMT700 replies with
the text "ready" as shown in the example below.
>$WMT700 v<version number>
ready.
- To check the status of the wind sensor, include the status code
item \er in the data message. You need to convert the status
code to a binary number to verify the status. An error code
does not indicate that the wind data is invalid. For more
information, see section Status Flags on page 123.
- To check that the wind data is valid, include the \va item in the
data message. For more information, see section Items for Data
Messages on page 119.
- To check other diagnostics-related data, include the required
items in the data message. For more information, see section
Items for Data Messages on page 119.
NOTE Only a power-off self-test exists. See Appendix A, Complete Command
Set for WMT700, on page 195.
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