Xylem SDI-12 Data Logger iRIS 220, iRIS 320, iRIS 350, iRIS 150, iRIS 300 - Manual (Page 40)

iRIS Datalogger User Guide V1.50
34 iQuest (NZ) Ltd - PO Box 15169, Hamilton, New Zealand Tel: +64 7 857-0810 Fax: +64 7 857-0811 Email: [email protected]
Option 5
When this option is selected you will be prompted to enter the length of time in minutes between the
successive operations of the output if the mode is set to 1 (Schedule).
> Frequency (min)=
Option 6
When this option is selected you will be prompted to enter a string representing the time at which the iRIS is
allowed to start controlling the output if the mode is set to 1 (Schedule).
> Start Time (HHNN)=
Option 7
When this option is selected you will be prompted to enter a string representing the time at which the iRIS
must stop controlling the output if the mode is set to 1 (Schedule).
> End Time (HHNN)=
See Section 4.4.7, titled IP Connection Schedule Cfg for details on how these parameters
configure the schedule operation.
Typical Scheduled Output Example
A ground water site using an iRIS is required to log a sample every hour that is obtained from a pressure
transducer whose power supply is controlled from the digital output, DO2 (DIO4 on the iRIS 350) which is a
switched 12V output. For early iRIS 220/320 (V1.1) boards, this output will need to be connected via an
external transistor switch. The transducer needs to be powered up for one minute prior to the
measurement being taken and logged. The settings required for DO2 to achieve this are shown below.
* Digital Output 2 Setup
0 Exit
1 Enable [Yes]
2 Polarity [Normal]
3 Mode [Schedule]
4 Duration [65 sec]
5 Frequency [60 min]
6 Start Time [0059]
7 End Time [2359]
The output will be activated at the beginning of the 59
th
minute of each hour in the day, starting at 00:59. It
will remain on for 65 seconds, ensuring that the sensor is still powered up at the point when the reading is
captured on the hour. The final output activation for the day will occur at 23:59 in preparation for the
midnight measurement.
If some averaging is required, the one minute averaging (process mode 4) can be selected.
However, set the scheduler to ensure that the sensor will be fully powered up before and
through out the one minute before logging.