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.....

[Ecem Çetinyol]

Did you find any solution? I have the same problem now.