Hello, To which pins of ST-LINK do I connect my MCU UARTx_TX UARTx_RX in order to operate virtual com port. Thank you,

[TDK]

There are many different ST-Link programmers. Please be a bit more specific.

In additional, all of them have user manuals within which you can find this information.

[ADani.2]

ST-LINK/V2

B 2016 33

[TDK]

Okay, so let's go to the documentation page:

https://www.st.com/en/development-tools/st-link-v2.html#documentation

And open up the user manual:

https://www.st.com/resource/en/user_manual/dm00026748-stlinkv2-incircuit-debuggerprogrammer-for-stm8-and-stm32-stmicroelectronics.pdf

And look at the pinout for the 20-pin connector:

 

There are no pins dedicated for a VCP connection because ST-LINK/V2 doesn't include this feature.

The newer debuggers such as STLINK-V3MINI and some ST-LINK/V2-1 debuggers do have this feature.

https://www.st.com/resource/en/technical_note/dm00290229-overview-of-stlink-derivatives-stmicroelectronics.pdf