User`s guide

Signal Tracing

Signal Tracing with the MATLAB Inter face and File Scopes

This procedure uses the Simulink model xpcosc.mdl as an example, and

assumes you have built the target application for this model. It also assumes

that you have a serial communication connection. Thistopicdescribeshowto

trace signals w ith file scopes .

Note The signal data file can quickly increase in size. You should examine

thefilesizebetweenrunstogaugethegrowthrateofthefile. Ifthesignal

data file grow s bey ond the available space on the disk, the signal data might

be corrupted.

1 Create an xPC Target application that works with file scopes. Type

tg=xpctarget.xpc('rs232', 'COM1', '115200')

2 To get a list of signals, type either

set(tg, 'ShowSignals', 'on')

tg.ShowSignals='on'

The MATLAB window displays a list of the target object properties for

the available signals. For example, the signals for the model

xpcosc.mdl

are shown below.

ShowSignals = on

Signals = INDEX VALUE BLOCK NAME LABEL

0 0.000000 Integrator1

1 0.000000 Signal Generator

2 0.000000 Gain

3 0.000000 Integrator

4 0.000000 Gain1

5 0.000000 Gain2

6 0.000000 Sum

For more information, see “Signal Monitoring with the MATLAB Interface”

on page 3-9.

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