Chapter 5 ________________________________________________________________ Operation
VAISALA ______________________________________________________________________ 165
The indication of the over-range as well as the under-range is always
correlated to the configured baseline length and therefore, to the specific
measurement range. If the configured baseline length is 30 m, the under-
range is indicated for MOR values below 10 m and the over-range
indication is set for MOR readings above 10 000 m.
The indication of code 4 represents a special case. This code indicates
that the reported MOR is based on the PWD visibility measurement and
occurs when the transmissometer measurement shows a vital error but
the PWD status is still OK and PWD visibility data are available. See
Table 15 below.
NOTE
Alternatively to the above described default behavior, it is possible to
disable the use of PWD MOR in error situations. The intended
respective behavior can be configured using the
PWD_MOR_ON_ERROR [ON|OFF] command as follows:
To disable the use of PWD MOR in error situations use the command set
pwd_mor_on_error off. The response would be PWD MOR is NOT
used on error.
To enable the use of PWD MOR in error situations (default) use the
command set pwd_mor_on_error on. The response is PWD MOR is
used on error.
Table 15 LT31 MOR Status (Byte Number 22)
Code Explanation Comment
0 OK
1 Underrange MOR below measurement range limit.
2 Overrange MOR above measurement range limit.
4 Based on
PWD
MOR value is based on PWD
measurement. (only if configured
accordingly)
8 Not valid System error.
NOTE
The listed status codes do not cover all possible cases. Combinations are
possible if applicable. If, for example, code 2 and code 4 occur at the
same time, it will lead to code 6.
For decoding the power supply status, see Table 16 on page 166.
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