buffering recieve data from serial port

hi
i wrote a code for ARM lpc1768 (ADC) then tansfer data by serial port(9600 baud rate) then i recieve data correctly in labview
but there is an issue that when i wanna plot it labview because of the sampling frequency labview cant detect most of data and just detect the peak of the sin wave input
in matlab i can plot data correctly because matlab buffering data
can someone help me how should i do this in labview?
i attach my design and result
thanks