LAUNCHXL-F280049C: External mode for debugging

I can build and deploy any program on the board (LAUNCHXL-F280049C). It works correctly.
For debugging purpose, I wanted to connect the board with my computer with the external mode. I have this error bellow.
I have try differents things:
In configuration parameter/hardware implementation/target hardware resources/external mode => try both COM port (UART and dataport)
Different switchs settings tried
S6 : 0 & S8 : 0
S3.1 : 1 & S4 : 1 & S8 : 1

__________________________________________________________________________________________
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 commandI can build and deploy any program on the board (LAUNCHXL-F280049C). It works correctly.
For debugging purpose, I wanted to connect the board with my computer with the external mode. I have this error bellow.
I have try differents things:
In configuration parameter/hardware implementation/target hardware resources/external mode => try both COM port (UART and dataport)
Different switchs settings tried
S6 : 0 & S8 : 0
S3.1 : 1 & S4 : 1 & S8 : 1

__________________________________________________________________________________________
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 I can build and deploy any program on the board (LAUNCHXL-F280049C). It works correctly.
For debugging purpose, I wanted to connect the board with my computer with the external mode. I have this error bellow.
I have try differents things:
In configuration parameter/hardware implementation/target hardware resources/external mode => try both COM port (UART and dataport)
Different switchs settings tried
S6 : 0 & S8 : 0
S3.1 : 1 & S4 : 1 & S8 : 1

Cart

Cart