XCP master internal error, serial receive, Arduino external mode

I have a very simple model I am trying to deploy onto an Arduino Due target hardware in external mode (Monitor & Tune). Just trying to view some incoming data from Port 2.

I am getting prompted with

External Mode Open Protocol Start command failed
Caused by:
XCP Master internal error: Busy(0) or no timeout(2) for 252 

Answer 1

[Stefanie Schwarz]

See related answers:

https://www.mathworks.com/matlabcentral/answers/469049-simulink-simulation-won-t-start-on-raspberry-pi3-in-external-mode

https://www.mathworks.com/matlabcentral/answers/518748-could-not-connect-to-xcp-slave-xcp-master-internal-error-busy-0-or-no-timeout-2-for-255