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National Instruments
16
NI WSN-3214 User Guide and Specifications
WSN Connect Button
Note
Refer to your NI WSN gateway documentation for detailed instructions about how to connect
a NI WSN-3214 to the NI WSN gateway.
The NI WSN-3214 is equipped with a WSN connect button, as shown in Figure 12. The button controls
network connection and the LEDs, which display connection status.
Pressing the WSN connect button results in the device responses shown in Table 2.
Reset Button
The NI WSN-3214 is equipped with a reset button, as shown in Figure 12.
Pressing the reset button results in the following device responses:
•
When pressed for fewer than 5 seconds, the device reboots with the current configuration.
•
When pressed for 5 seconds or more, the device reboots into Factory Default Mode, which returns
the device user configuration to the factory-set defaults.
Using the NI WSN-3214 Device
Caution
To ensure the specified EMC performance, operate this product only with shielded cables
and accessories. Cable shields must be connected to one of the DGND pins of the I/O connector.
Note
When you insert or remove a new sensor from the NI WSN-3214, slight changes in the
excitation voltages can cause a mismatch between the internal half-bridge completion resistors and
the half-bridge sensors, which results in a change in the measurement offsets. National Instruments
recommends performing bridge calibrations of quarter-bridge or half-bridge sensors after connecting
all sensors to the NI WSN-3214, and after removing, or attaching any additional sensor.
Strain-Gage Sensor Configurations
This section describes the configurations and signal connection of various supported strain-gage
configuration types.
Quarter-Bridge Type I
This section provides information for the quarter-bridge strain-gage configuration type I. The
quarter-bridge type I measures either axial or bending strain. Figure 13 shows how to position a
strain-gage resistor in an axial and bending configuration. Figure 14 shows the quarter-bridge type I
circuit wiring diagram.
Table 2.
WSN Connect State/Device Status
Current Device State
Duration of Button Press
Result
Initial power on,
not connected
Any duration
Node turns on and searches for an available network.
Connected to a
NI WSN gateway
<5 seconds
Node blinks all four signal strength LEDs twice, and
then displays the signal strength, as shown in Table 1.
≥
5 seconds
Node leaves current network and searches for a new
network.
