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iRIS 220 / iRIS 320, V1.19 User Guide
6.5 Connecting Analogue Wind Instruments
A relatively common type of digital water level instrument is one that provides two pulse outputs. One output
generates a pulse for each increment and the other for each decrement in level. The iRIS maintains a record
of these steps and therefore the relative level.
These instruments normally require a 12V supply and this is readily obtained from the iRIS. A
supplementary 12V battery can be connected if desired. Typically, this type of instrument requires very little
current, so the internal iRIS 320 battery will normally suffice.
The diagram below shows the required connects for such an installation. The incrementing output must be
connected to DI1 and the decrementing output to DI2.
TOP
BOTTOM
iRIS I/O Connector
AI4
AI3
AI2
AI1
AGND
5VOP
DI2
DI1
DO2
DO1
SDI-12
DGND
12V+
GND (-)
VIN+
GND (-)
- +
External
12V Battery
(Optional)
Wind
PULSE
Speed
+12V
Sensor
0V
Charging source
e.g solar panel
SUPPLY
SIGNAL
GND
Wind
Direction
Sensor