User`s manual

NexSens Technology, Inc.
iSIC User‟s Manual 65
3.3 Retrieving Data From Sensors
3.3.1 Manually Interrogating Data
Data is retrieved by the process of “interrogating” each sensor in the iChart database. Sensor
data may be downloaded manually by clicking the Interrogate button, or users can configure
an automatic “interrogation schedule” through iChart. By default a one hour automatic
interrogation schedule is set. This means that at the beginning of every hour, iChart will
automatically interrogate every sensor in the database.
To manually interrogate sensors, click the Interrogate button as shown below:
If you would like to automatically retrieve data at an interval other than one hour, simply change
the auto-interrogation schedule.
The auto-interrogation schedule is located within the schedule dialog box in iChart by clicking the
Schedule button as detailed in the following section.
The Turn ON live data button starts streaming live data to the iChart computer from the
sensors connected to the data logger. This allows you to receive an immediate, real time reading
from the project site. This data is not logged into the iChart database and is only for real time
data display.
Data will be updated as often as it can be retrieved from the sensors. For example, if an SDI-12
sensor connected to the data logger takes a minute and a half to return a reading the reading on
the screen will be updated every minute a half.