how to display digital signal

[weikeong]

I am running windows xp, Labview student edition 8 and NI-DQmx 8.0. I am using USB6009 to acquire digitized signal from microcontroller PIC16F877 after A/D conversion.

The analog input to microcontroller is a sinewave and the 8 bit digitized signal is fed to input of USB6009 digital line.

I want to know how can I display the 8 bit digital signal to be sinewave again using Labview and USB6009.

1. Am I correct to connect the digital signal to the input digital line?

2. How to configure DAQ Assistant in thi case?

3. Why can't I connect the Waveform Graph to the output of DAQ Assistant to display the sinewave? How to solve this problem?

[Steven_C]

Hi weikeong,

So if I understand correctly you are getting 8-bits of digital data and you want to make a sine wave in SW out of these digital values.

Here are some answers to your questions:

1. Yes this is correct
2. Here is a tutorial on using the DAQ assistant for digital IO

Configuring DAQmx Express VI using the DAQ Assistant (Digital I/O):

http://zone.ni.com/devzone/cda/tut/p/id/2744#toc5

3. The DAQ assistant will output what you you have acquired on the DI lines. You may want to use the digital to analog conversion vi, to get it back to an analog signal.

I hope this helps. Have a nice day!

Steven

Message Edited by Steven C on 01-15-2007 10:47 AM