Hi,
Firstly, you would want to understand how digital sensors work. Typically, they would communicate using a protocol. Standard protocols exist (UART, RS232, I2C, SPI etc) and it would be more straight forward to communicate using these protocols as NI has libraries/drivers for them.
Unfortunately, it seems that your sensor uses a non-standard proprietary protocol. In such instance, you will need to implement your own encoding/decoding of the digital signals. Adafruit also seems to provide library and example code for the Arduino, so that would be a good place to start, if you need a general idea on how the protocol works. It also seems that you will need to implement an additional external circuit that uses a pull up resistor.
For digital communication, it is preferable to use hardware timed DIO to ensure that the timing requirements are met. This feature does not seem to be supported on the WSN-3202.
You might get some mileage if you are using the programmable version of the WSN-3202, and uploading a custom code on the WSN-3202. However, if you are using the non-programmable version, you will face issues when trying to meet the timing requirements of the protocol, as the WSN is designed for low-rate monitoring applications.
Hope this helps!
