Acquiring data from scope RTC 1002 to MATLAB

Hi, I´m trying to connect the scope RTC 1002 (Rohde & Schwarz) to MATLAB using the TCPCLIENT connecntion. The connection looks fine but when I try to use the command writeread(), MATLAB throws the following error:

Error reading String.

Timeout occurred waiting for the String Terminator.

According to the RTC 1002 manual, the terminator for TCP connection is LF. However, even it is set into the code, I´m still no able to run the following code and get the data from scope channel 1.

CODE:

disp( '  ' );
disp( '=== CONNECTING TO THE SCOPE ===' );
disp( '  ' );

% try to open
try
    % The object creation function tcpclient both creates and connects the object.
    scopeObject = tcpclient ('147.83.49.54',5025);
    scopeObject.ByteOrder = "big-endian";
    scopeObject.Timeout = 20;
catch err
    disp (['*** Matlab error message : ' err.message]);
    return;
end
configureTerminator(scopeObject,"LF");
terminator = scopeObject.Terminator;
instrumentInfo = writeread(scopeObject, "*IDN?");
disp("Instrument identification information: " + instrumentInfo);
measureComplete = writeread(scopeObject,"*OPC?");
writeread(scopeObject,"AUT");
writeread(scopeObject,"ACQ:MODE RTI");
scopeSource = writeread(scopeObject,"CHAN1:DATA?");

Thank you for helping me

Answer 1

[Gayathri]

Hi @Nathalia Alves Rocha Batista,

I understand that you are facing the error “Timeout occurred waiting for the String Terminator.” while acquiring data from scope RTC 1002 to MATLAB.

What you see in the error message is the TCP/IP client saying that it expected a reply, but it did not receive a reply within the timeout period, or it did not receive the reply that it expected. You can try increasing the timeout value, which allows more time for the response.

This can also happen the terminator is not configured correctly. Even though you have identified the terminator to be “LF”, please try using other terminator options as well to check if data could be acquired in any one of the cases.

Please refer to the following link to a question which talks about the same error.

https://www.mathworks.com/matlabcentral/answers/665388-why-do-i-get-the-error-timeout-occurred-while-waiting-for-the-string-terminator

For more information on “configureTerminator” function, please refer to the following documentation link.

https://www.mathworks.com/help/matlab/ref/serialport.configureterminator.html

Hope you find this information helpful.

[Nathalia Alves Rocha Batista]

Hi,

Thank you for your inputs.

The terminator for this specific device is LF. Even if I increase the timeout, it was not working. But, I was able to solve the problem by adding pause(1) between writeread() command. This delay allowed enough time to write/read the data from the server.

Thanks