Serial Port Problem: s.BytesAvailable = 0 + TimeOut Error

G'Day!

Matlab code is unable to read serial device (FMCW Radar). Writing to device from MATLAB works fine. Terminator assignment is correct. "Eavesdropping" of serial part clearly shows that device receives request for data and generate it, but fscanf or fread fail to read data. MATLAB reports BytesAvailable as zero, even when data is streaming from serial device. Very disconcerting!

The critical lines of code affected are shown below:

FMCW = serial('/dev/cu.KeySerial1');
set(FMCW,'BaudRate',115200,'DataBits',8,'StopBits',1,...
    'Parity','none','FlowControl','none');
set(FMCW,'terminator','CR/LF');
FMCW.InputBufferSize = 2048;

fopen(FMCW);
FMCW.ReadAsyncMode = 'manual'

%%Trigger radar
   Non-relevant lines of code removed

flushinput(FMCW); % Flush serial port buffer

% Start asynchronous read from FMCW
  readasync(FMCW,2048);

% Request FMCW to report Radar data - THIS WORKS - Radar returns data.
  trace = 'trace:data ?';
  fprintf(FMCW,'%s\n',trace);
  pause(0.2);

% Show bytes available at buffer to be read
  fprintf('FMCW.BytesAvailable = %d\n',FMCW.BytesAvailable); 

% Thansfer serial port buffer content to MATLAB
  [r,n] = fscanf(FMCW,'%s',2048);
  pause(0.2);

stopasync(FMCW);
fclose(FMCW); % Close the serial port
delete(FMCW); % Delete the serial object
delete(instrfindall); % Delete serial devices catalog

The data stream looks like this (but for n=2048):

49562.000000 49486.000000 49638.000000 49727.000000

Error reported:

    >> miniFMCWtridata
       FMCW.BytesAvailable = 0
       Warning: Unsuccessful read: A timeout occurred
       before the Terminator was reached or SIZE
       values were available.

System: Matalb 2013b, Sivers IMA FMCW radar(serial device), KEYSPAN USB Serial Adapter, Mac OS X ver10.6.8 & MacBook.

This is time sensitive, and I will recognize support on my PhD thesis! If you live in Idaho, I will buy dinner!

Suggestions, work-arounds, hints, tips are all welcomed!

Thanks!

Chago