Code covered by the BSD License  

Highlights from
Collect and plot data from a TCPIP server in real time

image thumbnail

Collect and plot data from a TCPIP server in real time



Obtain real time data from a TCPIP object using Instrument Control Toolbox and visualize it live.

%% Real Time Data Stream Plotting Example
function real_time_data_stream_plotting
% This example demonstrates how to automatically read a set number of data bytes as and
% when they are available. This MATLAB(R) script also generates a real time plot of streaming 
% data collected from the TCPIP server.  
% The script may be updated to use any instrument/device/TCPIP server
% to collect real time data. You may need to update the IP address and
% port.
% 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);

% Author: Ankit Desai
% Copyright 2010 - The MathWorks, Inc.

%% Create the interface object
% Create a TCPIP object listening to port 19 (Character Generator).
% *Note* : To enable character generator service at port 19 on a Windows platform, enable:
%  Control Panel > Add Remove Programs > Add/Remove Windows Component > Networking Services
interfaceObject = tcpip('localhost',19);

% Setup a figure window and define a callback function for close operation
figureHandle = figure('NumberTitle','off',...
    'Name','Live Data Stream Plot',...
    'Color',[0 0 0],...

% Setup the axes 
axesHandle = axes('Parent',figureHandle,...
    'YColor',[0.9725 0.9725 0.9725],...
    'XColor',[0.9725 0.9725 0.9725],...
    'Color',[0 0 0]);

xlabel(axesHandle,'Number of Samples');

% Initialize the plot and hold the settings on
hold on;
plotHandle = plot(axesHandle,0,'-y','LineWidth',1);

%% Setup interface object to read chunks of data
% Set the number of bytes to read at a time
bytesToRead = 500;

% Define a callback function to be executed when desired number of bytes
% are available in the input buffer
interfaceObject.BytesAvailableFcn = {@localReadAndPlot,plotHandle,bytesToRead};
interfaceObject.BytesAvailableFcnMode = 'byte';
interfaceObject.BytesAvailableFcnCount = bytesToRead;

% Open the interface object
%% Implement the bytes available callback
function localReadAndPlot(interfaceObject,~,figureHandle,bytesToRead)

% Read the desired number of data bytes
data = fread(interfaceObject,bytesToRead);

% Update the plot

%% Implement the close figure callback
function localCloseFigure(figureHandle,~,interfaceObject)

% Clean up the interface object
clear interfaceObject;

% Close the figure window

Contact us