Unable to go to external mode

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Syed Hamza Ali
Syed Hamza Ali 2017-7-31
编辑： Walter Roberson 2021-11-13
I am running simple LED blinking using Simulink and Arduino and i am running into this error
Build process completed successfully
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 'Arduino Uno' target for 'syched'.
What to do.
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tuan le tho
tuan le tho 2019-5-28
Thanks a lot for sharing
That trick works
Victor Maciel
Victor Maciel 2020-7-10
Me too, Rok Avsec. The problem was the baud rate too high.

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回答（6 个）

abdolreza azizi
abdolreza azizi 2018-6-15
i have this problem for matlab2018 and latest simulink support package.how fix it?
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abdolreza azizi
abdolreza azizi 2018-6-21
recently I installed Matlab 2018a with update2 and the latest Simulink support package for Arduino hardware. when I deploy the Simulink model to Arduino mega2560, it works well. but when I want to run in external mode, this error occurs. also : 1. I don't have any additional devices or shields. 2. about three months ago with Matlab 2017a and latest support package i able to run external model and also deploy the model to Arduino mega2560, due, and UNO. but last week I tried to run external model on Arduino, but it didn't work. (deploy works well ) then I change my Matlab to 2018a with update 2 and latest support package. the fault occurs again but i can deploy the Simulink model to Arduino and it works well. 3. it didn't work with basic example model.
abdolreza azizi
abdolreza azizi 2018-6-22
编辑：Walter Roberson 2018-6-25
AVR Memory Usage
----------------
Device: atmega2560
Program: 21432 bytes (8.2% Full)
(.text + .data + .bootloader)
Data: 1479 bytes (18.1% Full)
(.data + .bss + .noinit)
### Successful completion of build procedure for model: arduino_communication
Build process completed successfully
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.

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Madhu Govindarajan
Madhu Govindarajan 2017-10-26
Have you tried manually setting the COM port to the accurate port? Another common issue that causes this - A MATLAB arduino object already exists. This would not allow you to do External mode at the same time and you have to clear the object before you do external mode.
If error still persists, please reach out to Technical support of MathWorks.
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Steffen Hartmann
Steffen Hartmann 2018-10-30
Hello, I have the same problem when using simulation/external on my arduino uno system. When running on the hardware with "deploy to hardware" the code runs standalone like expected. That means communication in not a problem? It´s set to "Manual/com3". Could it be that simulation uses another com-port? Thank you in advance
Madhu Govindarajan
Madhu Govindarajan 2018-10-31
Try a power cycle of switching off the Arduino power via USB and other external sources, then double pressing the RESET button to put it in bootloader mode. Then try external mode again.
Btw, with Arduino Uno there are some release restrictions. More info here - https://www.mathworks.com/hardware-support/arduino-simulink.html

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DEBASISH MISHRA
DEBASISH MISHRA 2018-3-27
Hi, try to reduce the step size, may be 50e-6
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Walter Roberson
Walter Roberson 2018-3-28
The timeout on connection to target has nothing to do with step size. It is a problem in reaching the device at all.

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Benjamin
Benjamin 2018-6-25
I have the same problem. Any solutions?
Gonzalo Cabanas
Gonzalo Cabanas 2018-11-13
I have the same problem with an Chinese replica Arduino Mega 2560...Did anyone solve this problem?
Thank you guys!
satish moupuri
satish moupuri 2021-11-5
I have the follwing error while click the connect button after connecting the generic F28335 board
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.

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