STM32H573 & RS232

[madhu1]

Hello Everyone, I am using STM32H573. Do we need to connect RS232 to UART transceiver or can we directly interface Rs232 signals with UART?

[AScha.3]

Hi,

CPU is at 0/+3,3V signal level, real RS232 maybe +/- 9 V signal ;

you need some interface, UART transceiver or similar. (without you damage the cpu ! )

[mƎALLEm]

Hello @madhu1 ,

Indeed you need a transceiver. Example: ST3232

[madhu1]

Can I use a voltage level shifter and then connect to UART pins of micro?

[mƎALLEm]

If you mean by "a voltage level shifter" to replace the transceiver, the answer is no.

This is the ranges for RS232 with negative voltage:

So please use a suitable transceiver.