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Set External Mode Scope Parameters

Simulink® normal and accelerator modes run the simulation algorithm in Simulink and access the external hardware by using drivers running in operating system kernel mode. The Simulink block diagram is a user interface to your real-time application.

Simulink external mode connects your Simulink model to your real-time application. You can use the Simulink block diagram as a user interface as you can in normal or accelerator mode.

This procedure uses the model sldrtex_model. To open this model, in the MATLAB Command Window, type:


It assumes that you have already loaded that model.

After you have created a real-time application, you can enter scope parameters for signal tracing with Simulink external mode:

  1. In the Simulink Editor, on the Desktop Real-Time tab, click Prepare > Hardware Settings.

  2. In the Configuration Parameters dialog box, select the Code Generation > Simulink Desktop Real-Time node.

  3. If you select the External mode check box, your changes affect the real-time application.

    Check that the MEX-file name label has an entry of sldrtext. The MEX-file sldrtext.mex* is supplied with the Simulink Desktop Real-Time™ software. This file works with Simulink external mode and supports uploading signal data and downloading parameter values.

    Click OK.

  4. In the Simulink Editor, on the Desktop Real-Time tab, click Prepare > Control Panel. In the External Mode Control Panel, click the Signal & Triggering button.

  5. Select the Select all check box. From the Source list, select manual. From the Mode list, select normal.

    The X under Signal selection indicates that a signal is tagged for data collection. T indicates that the signal is tagged as a trigger signal.

  6. In the Duration field, enter the number of sample points in a data buffer. For example, to specify a sample rate of 1000 samples/second and a stop time of 10 seconds, enter:

  7. Select the Arm when connecting to target check box.

    If you do not select this check box, data is not displayed in the Scope window.

  8. Click Close.

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