Real-Time Workshop

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.

Implementing an External Mode Protocol Layer

If you want to implement your own transport layer for external mode communication, you must modify certain code modules provided by Real-Time Workshop, and rebuild ext_comm, the external interface MEX-file. This advanced topic is described in detail in Creating an External Mode Communication Channel.

Running the External Program

Limitations of External Mode