Xylem iRIS 150 GPRS DATALOGGERS - Manual (Page 14)

iRIS 150 V1.11 User Guide - 8
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4.2.5 Digital Output
The Digital Output is open drain pull-down and is capable of sinking up to 300mA at 30Vdc. Typically this
could be used to drive a relay powered by an auxiliary d.c supply (e.g. 12V). In this mode, the negative of
the relay supply must be connected to one of the iRIS GND terminals.
The output can be programmed to follow a schedule for use in powering external sensors/circuits, or operate
in response to alarm activation from any of the sensors.
See Section 5.3.7 for details on the digital output modes.
Figure 3 – Digital Output Circuit