Error occurred while executing external mode mex-file 'ext_comm': timed-out waiting for second connect response packet when using Simulink raspberry pi support package.

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Tian Bao Chiu 2022-2-28

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https://ww2.mathworks.cn/matlabcentral/answers/1660370-error-occurred-while-executing-external-mode-mex-file-ext_comm-timed-out-waiting-for-second-conne

回答： Chetan 2023-9-15

Hi

I am trying to get information about the encoder on the motor by using Simulink raspberry pi support package, my raspberry pi version is 4B

Here is my Simulink program:

The following are the settings of my encoder block:

I use Monitor and tune button to run the program on Rpi 4B , but when the code is uploaded to the board, it gets stuck in the initialization part, and then I get the following error message:

"Error occurred while executing external mode mex-file 'ext_comm': timed-out waiting for second connect response packet"

I was looking for a solution to a similar problem in the forums, and there were people who mentioned baud rate modification, but I didn't find any baud rate modification method in my hardware settings section:

How can I fix this error? Any help will be pretty much appreciated.

Thanks in advance.

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Nirmalkumar Doreraju 2022-3-3

Hi Tian,

The problem mentioned happens only for Encoder blocks or does it happen even when you run a simple model like 'raspberrypi_gettingstarted' in 'Monitor & Tune'?

Regards,

Nirmal

Tian Bao Chiu 2022-3-3

编辑：Tian Bao Chiu 2022-3-3

Hi Nirmal,

Other example programs can work normally, such as "raspberrypi_gettingstarted", as long as there are no Encoder blocks in the program, they can run normally on the Raspberry Pi 4B, but as long as the Encoder blocks are added, the error content:"Error occurred while executing external mode mex-file 'ext_comm': timed-out waiting for second connect response packet" will appear.

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