STM32H573 & RS232

madhu1 · ‎2024-01-23

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

SofLit · ‎2024-01-23

Hello @madhu1 ,

Indeed you need a transceiver. Example: ST3232

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AScha.3 · ‎2024-01-23

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 ! )

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SofLit · ‎2024-01-23

Hello @madhu1 ,

Indeed you need a transceiver. Example: ST3232

To give better visibility on the answered topics, please click on "Accept as Solution" on the reply which solved your issue or answered your question.

madhu1 · ‎2024-02-02

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

SofLit · ‎2024-02-02

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.

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