Noob need help reading rs232 via matlab

[vptran84]

Hi,

Here is what I am trying to do.

On one computer i open matlab and run the program (posted below) to open the serial port and read data. On the other computer i open hyperterminal and send data. If the data i receive in matlab is the same as the data i sent then you know the matlab program is working correctly.

So I am trying to read data from the rs232 via matlab, but i am struggling g
reatly.

here is my code:

s = serial('com1');
s.InputBufferSize = 10;
fopen(s);
fid = fopen('C\out.txt', 'w')
a = fread(s,8);
fwrite(fid,char(a));
fclose(s);
fclose(fid);
Results:

fid =

3

Warning: The specified amount of data was not returned within the Timeout period.

I don't really know what is wrong.

Please if anyone could, I would greatly appreciated. This is taking me so much time, and I am on the brink of madness. thank you.

 

[JockeK]

Are both computers set to the same baud-rate? Maybe some of the other serial properties are different on your computers. Use get(s) to get at list of all properties.

Are you using a nullmodem cable? See

http://www.zytrax.com/tech/layer_1/cables/tech_rs232.htm#null_db9

for more info.