Delta OHM HD32MT.3, Operating Manual

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HD32MT.3
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V1.2
6 STORAGE OF MEASUREMENTS
To begin the process of acquisition and storage of the measures, it is necessary to indicate to
the data logger which sensors are connected to its inputs and what measurements store. The
programming of the data logger can be done in two ways:
1.
Through the Help of the Meteo Studio software, by connecting the USB output of the data
logger to the PC via USB cable CP22.
2. Through serial commands to be sent with a standard communication program, by connect-
ing the auxiliary serial communication port (COM AUX) of the data logger to the PC. It is
possible to use the CP24 USB/RS485 adapter cable to connect to the M12 connector lo-
cated on the lower part of the case. The port settings are: 115200 b/s, 8N2.
The two channels of communication (USB and COM AUX) coexist which means that they can
operate simultaneously and no switching between the two channels is required.
For programming with Meteo Studio, see the software instructions. For programming via serial
commands, see Chapter 11 (in particular, see paragraph 11.6 for the activation of the sensors
and the choice of measures to be stored).
The maximum number of storable measurements is 30.
The sensors measurements are stored with a minimum interval of 10 seconds. It is possi-
ble to store the actual value or the minimum, maximum or average of the measures acquired
once per second in the interval of 10 seconds. For measures of impulsive type, for example the
measurement of amount of rain, it is possible to store the total quantity of pulses received.
The following files are stored in the SD card:
1.
T1-type files: contain measurements with logging interval 10 second.
2. T2-type files: contain the records of the rain gauge pulses. T2 files are generated only if
the data logger is programmed to store the measurements of the rain gauge. The T2 files
contain information relating to the instants (date and time) when the impulses of the rain
gauge occurred, but do not contain information on the total amount of rainfall, which is in-
stead contained in the T1 files.
3. T3-type files: contain measures with logging interval 1, 2, 5 or 10 minutes depending on
how much programmed into the data logger. Files are cumulative, i .e. they contain all the
measurements recorded since the beginning of the day.
4. T4-type files: contain measures with logging interval 1, 2, 5 or 10 minutes depending on
what is programmed into the data logger. Unlike the file type T3, these are not cumula-
tive, but only contain recordings of a range of day.
In the SD card a folder is created for each day of recording. The files are saved in the card
with an interval settable to 10, 20, 30 or 60 minutes. The files of the same type are character-
ized by a sequential number (for example, if the files are stored every hour in each folder
there are 24 files of type T1 and T4 numbered from 1 to 24).
The instrument is in continuous logging mode. The storage of a quantity measure starts auto-
matically as soon as the quantity is added to the storage tables T1...T4.
The internal EEPROM memory of the data logger is operated in a circular way: when the
memory is full, new data will overwrite the oldest. The internal memory can store up to about
56 hours recording with fixed 10 seconds logging interval, and can store up to 8191 pulses of
the rain gauge.