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MDK_Software Interferes with RS232 Port or visaversa

I am trying to use Teraterm rs232 comport. when I am running MDK Arm Software to download the
program or in debug mode. The problem I see is that the ULINK2 can not be accessed when
I set TeraTerm to the comport where I have a USB adapter to RS232 interface.

As soon as I close Teraterm the ULINK2 can be accessed.

This problem started occurring when I had to reinstall the MDK ARM software because I tried
to install the free STM Lo version. and lost the MDKLite license. So I just uninstalled the
MDK version and reinstalled it again to get back the MDK Lite license.