User`s guide

4 External Mode
4-26
Enabling External Mode
To enable external mode, display the Simulink block diagram and select
External from the Simulation menu:
Next, select
Start from the Simulation menu, as you would to begin a
simulation and change parameters as desired.
Possible Error Conditions
If the Simulink block diagram does not match the external program, Simulink
displays an error box informing you that the checksums do not match (i.e., the
model has changed since you generated code). This means you must rebuild the
program from the new block diagram (or reload the correct one) in order to use
external mode.
If the external program is not running, Simulink displays an error informing
you that it cannot connect to the external program.