HyQuest Solutions iRIS Under Cover, User Manual

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Installation
failure, HyQuest Solutions recommend removing the debounce selection link for the appropriate input. This
sets the input to electronic switching mode, even if the actual pulse source is a clean contact (reed switch or
similar).
The debounce jumpers are located in the center of the PCB and can be accessed once the front cover is
opened. See Figure
Digital Input Debounce Links above.
Hint: When removing a jumper, simply fit it to only one pin of the connector to avoid it being lost.
2.3.3.2 Digital Output (Pro)
Note : Digital Output is only available on iRIS Under Cover Pro Version
When the iRIS digital I/O channel is configured as an output it can be operated electrically in one of two ways. Either:
Open-drain Pull-down which is capable of sinking up to 100mA at 30Vdc. An integral diode provides transient protection.
Typically this output mode can be used to drive a relay or lamp powered by an auxiliary d.c supply (e.g. 12V). In this
mode, the negative of the load supply must be connected to one of the iRIS GND terminals.
Although it may appear possible to directly control sensors by switching the sensor negative supply lead
using a digital output, this will introduce measurement errors and may possibly damage the sensor. Always
use a digital output configured as a switched 12V output to power sensors.
Or:
Switched 12V output which is capable of sourcing up to 100mA. Typically this output mode will be used to drive a sensor,
relay or lamp powered by the iRIS’s 12V supply.
Care should be taken to avoid the load discharging the internal and/or external 12V battery. Ensure
adequate power supply charging capacity is available to cater for the demands of both the iRIS and load.
The digital outputs may also be programmed to follow the state of the IP connection so that they will be active when a
wireless IP session has been established. This mode can be used to control power to an external data radio when using the
iRIS as a radio based gateway.
Typically, an output is configured to follow a schedule for use in powering loads. There is a similar mode termed
"Schedule Plus".
In "Schedule Plus" mode, the relevant output(s) will be activated when a user is logged on to allow sensor
calibration or radio communication testing.
Alternatively they can be selected for remote control directly from a HydroTel™ base station, activation if any alarm is
active in the iRIS or to operate in response to absolute set points against the current sensor value on Sensor #1 for
applications such as triggering sediment samplers.
See Section Digital I/O for details on the digital output modes.
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