Deep SUNA Manual
For SUNA running firmware version 2.4 or later
5. Configuration Parameters in Context
5.3 Data Acquisition Configuration
Data acquisition is primarily controlled via the operating mode. Each operating mode
has secondary configuration parameters for fine tuning. Both data processing and
output generation configuration are independent of the data acquisition scheme.
In the following paragraphs, each operating mode is described, and the configuration
parameters relevant to that operating mode are explained.
5.3.1 Continuous and Fixed-time Operating Mode
Continuous mode generates an uninterrupted stream of data. Data collection is
autonomous.
When powered, the sensor starts collecting and outputting data. Data acquisition ends
when power is removed or the $ character is sent via serial input. In fixed time mode,
data acquisition proceeds for the maximum time configured via fixed-time duration, after
which the sensor enters low-power standby.
When collecting data in continuous mode, changes in the spectrometer temperature
impact the measured concentrations. For best accuracy, regular dark measurements
are required to compensate for the changing temperature. The user can choose a dark
to light data rate based either of a number of samples or on the duration, via the
Operation Control configuration parameter. Then, the sensor will collect data in a D-
L-...-L-D-...-D-L... schema. If operation control is SAMPLES based, the user controls the
respective numbers via the Light Samples and Dark Samples configuration parameters.
When operation control is DURATION based, the user controls the respective durations
via the Light Duration and Dark Duration configuration parameters.
Configuration: Operation Control, Countdown, Light Samples, Dark Samples, Light
Duration, Dark Duration.
5.3.2 Periodic Operating Mode
Periodic mode generates short bursts of data at pre-configured times. Data collection is
autonomous.
When powered, the sensor enters low-power standby. Any activity on RS-232 or USB
brings the sensor within three seconds to the command interface, indicated by SUNA>.
After a duration of Countdown seconds (configuration parameter) without input, the
sensor returns to low power standby.
At the pre-configured times, the sensor collects a fixed number of data points, or data
points for a fixed duration. After data collection, the sensor returns to low-power
standby.
The start times of the data collection events are separated by a fixed interval. Possible
values for the interval are 1, 2, 5, 10, 12, 15, 30, minutes, or 1, 2, 3, 4, 6, 12, or 24
hours. The time grid starts relative to the start of the day. The time grid can be offset
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