MATLAB: Is Simulink external mode for TI C2000 boards full duplex or half duplex

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Is Simulink external mode for TI C2000 boards full duplex or half duplex?
I am having a problem with my external mode connection. I have a half duplex 422/485 transceiver on my hardware that I think is the issue. Here is the error message:
Error occurred while executing External Mode MEX-file 'ext_comm':
Failed to connect to the target. A time-out occurred while waiting for the connection response from the target. Possible reasons for the time-out:
a) The target is not switched on.
b) The target is not connected to your host machine.
c) The application for the model is not running on the target. You might have clicked the Stop button. If the Run button is not dimmed, click it. Otherwise, click the Build button, which downloads and runs your application on the target.
Component: Simulink | Category: Block diagram error
Unable to connect to the 'TI Delfino F2837xD' target for 'c2837xd_ipc_cpu1_tx_dps'.
Component: Simulink | Category: Model error

Best Answer

External mode communication requires full duplex.