Problem with real time communication in C2000 (F2837xD)
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I am using F2837xD controlcard. I also attach my file here. I want to read the Analog data through ADC port and that's why i am using "Monitor and Tune" option in the Hardware. But when i press it then it shows the error (But i can use "Build, Deploy and Start" option to run it):
Component:Simulink | Category:Block diagram warning
action: EXT_INIT Creating Target Handler (XCP on Serial)... Build directory: E:\University of South Carolina\OneDrive - University of South Carolina\Study\PhD\Laboratory Work\C2000 Programming\Simulink\Blinky_v1_ert_rtw Serial Port Name: COM6 Baud Rate: 115200 action: EXT_CONNECT Connecting to the target...
External Mode Open Protocol Connect command failed
Caused by:
- Could not connect to target application: XCP internal error: timeout expired, in response to XCP CONNECT command

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Answers (1)
Ayush
on 11 Dec 2025 at 6:14
Hi Sahdev,
I understand you’re encountering an “External Mode Open Protocol Connect command failed” error which typically indicates a communication issue between your host computer and the target hardware.
You can ensure that "COM6" is the correct port for your target device, is not being used by another application, and that all serial settings (baud rate, parity, stop bits, etc.) in Simulink match those configured on your target hardware. Also, double-check your cable and physical connections to rule out any hardware issues.
You may refer to the following documentation to understand the parameter tuning for C2000:
If the problem persists, try power-cycling your hardware and restarting MATLAB/Simulink. You may also want to check for any firmware or driver updates for your hardware.
Hope this helps!
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