Xylem SDI-12 Data Logger iRIS 220, iRIS 320, iRIS 350, iRIS 150, iRIS 300 User Manual
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iQuest (NZ) Ltd - PO Box 15169, Hamilton, New Zealand Tel: +64 7 857-0810 Fax: +64 7 857-0811 Email: [email protected]
In scheduled mode, the relevant output(s) will be activated when a user is logged on to allow
sensor calibration or radio communication testing.
DIO3 (DO1 in iRIS 320 emulation) is used to control an external radio or communication device via
an I/O port or relay
DIO4 (DO2 in iRIS 320 emulation) is used for controlling external sensor(s) by applying switched
12V.
Alternatively they can be selected for remote control directly from a HydroTel™ base station, activation is
any alarm is active in the iRIS or to operate in response to absolute setpoints against the current sensor
value on Sensor #1 for applications such as triggering sediment samplers.
See Section 4.4.11 for details on the digital output modes.
Figure 8 - Digital Output Pull-Down Mode Circuit
Figure 9 - Digital Output Switched 12V Mode Circuit
DOUT1
DGND
DOUT2
+12V
DGND