visual c++ (cvi) rs232

I am using National instruments CVI with a Visual C++ and I am having a problem graphing a input rs232 signal. Does anybody know how I can capture a input signal of a instrument and graph it. I am able to send commands and communicate with my instrument but, I can't capture the data and graph and plot it. My command to my instrument is BBcr to tell my instrument for a data request. If anybody has any suggestions I would appreciate it. Thanks
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