Collect and plot data from an instrument in real time

Real time data collection & plotting using query based instrument interactions.

Description

This MATLAB(R) script generates a real time plot of voltage values collected from an Agilent(TM) 34401A Digital Multimeter over the serial port(RS232). The data is collected and plotted until the predefined stop time is reached. This example also demonstrates automating a query based interaction with an instrument while monitoring the results live.

This script can be modified to be used on any platform by changing the serialPort variable.

Example:-
On Linux: serialPort = '/dev/ttyS0';
On MacOS: serialPort = '/dev/tty.KeySerial1';
On Windows: serialPort = 'COM1';

The script may also be updated to use any instrument/device to collect real time data. You may need to update the SCPI commands based on information in the instrument's programming manual.

To generate a report of this entire script, you may use the PUBLISH command at the MATLAB(R) command line as follows:

publish(real_time_data_plot);

• MATLAB release: MATLAB 7.8 (R2009a)

[Diego Orlando]

 

[Christian Franco]

Hallo and thank you for your work. When i run the file it prompts an error that said

??? In an assignment A(I) = B, the number of elements in B and
 I must be the same.

Error in ==> real_time_data_plot at 81
    voltage(count) = fscanf(serialObject,'%f'); %#ok<SAGROW>

thank you

[Ankit Desai]

You are getting that error since the fscanf on the serial object did not return any data. You might want to put in a check to make sure you are getting data in each iteration. Hope this helps.