STM32H753-EVAL -- Use DB9 port (CN2) as usart 1

[giorgio29]

Hie, according to the documentation of the board, USART1 can be used with db9 port by setting up JP7 and JP8 to 1 and 2 ( which I did). The second thing is to connect usart_tx and usart_rx to PB14 and PB15.
The problem is that nothing is showing up on the pc with DB3 port. I've check the tx port with an oscilloscope and I'm getting signal on data sending but only 1.1 V (in AC). I don't know if it's part of the issue but I hope someone has the solution

Thanks

[mƎALLEm]

Hello @giorgio29 and welcome to the ST community,

I didn't understand this statement:

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@giorgio29 wrote:

The second thing is to connect usart_tx and usart_rx to PB14 and PB15.

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Why you need to do that? by setting up JP7 and JP8 to 1 and 2 connects RS232_Tx and RS232_Rx respectively to PB14 and PB15. From the board schematic:

PB14 and PB15. Did you wire something on the board?