Thread Subject: Sending data with Matlab to an external device

Hi, I am trying to send the number "1" to an external device in matlab using a virtual serial port provided by the device. This is the code, but it is not working. What can be the problem?

s=serial('COM3','BaudRate',9600);
fopen(s);
ledon=[1];
fwrite(s,ledon);
fclose(s);

"Jose " <jose_a_f@hotmail.com> wrote in message <ip7oqo$i52$1@fred.mathworks.com>...
> Hi, I am trying to send the number "1" to an external device in matlab using a virtual serial port provided by the device. This is the code, but it is not working. What can be the problem?
>
> s=serial('COM3','BaudRate',9600);
> fopen(s);
> ledon=[1];
> fwrite(s,ledon);
> fclose(s);


In order for serial object to correctly communicate, the properties set for the object need to match the ones on the device/instrument.

So the first thing I would try is to check if the setting on the device matches the serial object properties eg:- BaudRate, Parity, FlowControl.

Also, if you plan to write 1 as a character, you might want to use fprintf command. Here's online help for fprintf: http://www.mathworks.com/help/techdoc/ref/serial.fprintf.html

Hope this helps

-Ankit