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NI WSN-3202 User Guide and Specifications
20
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Powering an External Sensor
The NI WSN-3202 device can provide up to 20 mA at 12 V to external sensors through its sensor power
(SEN PWR) terminal. You can configure this sensor power output using NI-WSN software to turn on a
sensor up to 250 ms prior to the start of an acquisition. Figure 18 shows the sensor power circuit
connected to a device.
Figure 18.
Powering an External Sensor with the NI WSN-3202
Make sure the device you are connecting is compatible with the NI WSN-3202 sensor power circuit
voltage and current ranges. Refer to the
section for more information.
Controlling Digital Inputs and Outputs
The NI WSN-3202 device has four bi-directional digital I/O channels, and each channel supports
four operational modes: Drive High Only, Drive Low Only, Drive High and Low, and Tristate. Use the
Node Properties
dialog box in the LabVIEW Project Explorer window to change DIO settings.
Figure 19.
Simplified Circuit Diagram of One DIO Channel
Terminals 9–17 are the DIO section on the 18-position screw terminal connector. Each DIO channel has
a signal terminal (DIO.
x
) and a ground terminal (D GND). There is also a terminal for the positive
terminal of DIO Power (DIO PWR), which is only required when one of the DIO channels is configured
for sourcing output. There is an internal Digital Input terminal which reads the digital output current
state or the value of DIO.
x
when configured for Tristate mode. The NI-WSN software controls the
different modes of operation by turning on and off the high side and low side switches.
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x
AI GND
S
EN PWR
Powered
S
en
s
or
DIO PWR
High
S
ide
S
witch
DIO.
x
D GND
Low
S
ide
S
witch
DI
(Intern
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