Serial timeout before terminator

hi,
s = serial('COM1');
set(s,'BaudRate',4800);
fopen(s);
fprintf(s,'something to send')
out = fscanf(s);
fclose(s); delete(s);
I am using pic16f877a with matlab. I loaded this above code in matlab. but in command window, i am getting
Warning: A timeout occurred before the Terminator was reached.
what is this problem, how will transmit data's to pic and where can i see the received data?
pls help me, i am in need of.....

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