Vaisala Hydromet Data Collection Platform - Manual (Page 162)

User’s Guide ______________________________________________________________________
160 __________________________________________________________________M210785EN-E
To set up a query, proceed as follows:
1. Select the line containing the desired query.
2. Click the Add button to make a copy of it.
3. A Query frame appears above the Configuration Item frame. In
the Query frame, you must give a unique name to the query and
define the calculated function, start time, and period of the query.
The new query will also appear in the list with the default query.
Additional Calculation Options
In addition to the available preconfigured statistics options, the generic
statistics provide the following configurations (refer to
Figure 79 on
page 161 ):
- Current sample interval(s): Gives an interval how often the value
for the current sampling period is updated, the value which can be
requested by setting both query parameters Start time and Period to
0. By default, it is set equal to the calculation interval, but if, for
example, a cumulative precipitation sum for the current hour is
requested, it can be set to a shorter value.
- One sample per interval: Stores only one sample per interval. If,
for example, multiple measurements are made during an update
interval, only the last one is stored. It is recommended that you do
not select this option.
- Show zero sum: Effective only with sum statistics. Selects
whether the statistics show 0 or invalid value after a device reset or
when requesting a current sample value right after statistics
stepping (see current sample interval). On by default.
- Calculate complete interval: Starts the calculation upon the first
complete interval.