2024-01-23 12:11 AM
Hello Everyone, I am using STM32H573. Do we need to connect RS232 to UART transceiver or can we directly interface Rs232 signals with UART?
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2024-01-23 12:27 AM
2024-01-23 12:21 AM - edited 2024-01-23 12:23 AM
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 ! )
2024-01-23 12:27 AM
2024-02-02 12:48 AM
Can I use a voltage level shifter and then connect to UART pins of micro?
2024-02-02 02:11 AM - edited 2024-02-02 03:58 AM
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.