RS-485 using USART or UART port on STM32
$begingroup$
On STM32F405 MCUs there are USART ports as well as UART ports available. If I need to implement RS-485 communication then which one of these should be used, USART or UART? Or are both of them equally good for RS-485 communication?
I have searched through the datasheet as well as reference manual for the MCU, but it does not provide additional information regarding the RS-485 implementation.
stm32 uart rs485 3.3v
edited Feb 25 at 12:48
Peter Mortensen
1,60031422
asked Feb 25 at 4:48
scico111scico111
376111
$endgroup$
add a comment |
$begingroup$
On STM32F405 MCUs there are USART ports as well as UART ports available. If I need to implement RS-485 communication then which one of these should be used, USART or UART? Or are both of them equally good for RS-485 communication?
I have searched through the datasheet as well as reference manual for the MCU, but it does not provide additional information regarding the RS-485 implementation.
stm32 uart rs485 3.3v
edited Feb 25 at 12:48
Peter Mortensen
1,60031422
asked Feb 25 at 4:48
scico111scico111
376111
$endgroup$
2
$begingroup$
Why is this question tagged with "3.3v"? How is this relevant?
$endgroup$
– Peter Mortensen
Feb 25 at 12:27
add a comment |
$begingroup$
On STM32F405 MCUs there are USART ports as well as UART ports available. If I need to implement RS-485 communication then which one of these should be used, USART or UART? Or are both of them equally good for RS-485 communication?
I have searched through the datasheet as well as reference manual for the MCU, but it does not provide additional information regarding the RS-485 implementation.
stm32 uart rs485 3.3v
edited Feb 25 at 12:48
Peter Mortensen
1,60031422
asked Feb 25 at 4:48
scico111scico111
376111
$endgroup$
On STM32F405 MCUs there are USART ports as well as UART ports available. If I need to implement RS-485 communication then which one of these should be used, USART or UART? Or are both of them equally good for RS-485 communication?
I have searched through the datasheet as well as reference manual for the MCU, but it does not provide additional information regarding the RS-485 implementation.
stm32 uart rs485 3.3v
stm32 uart rs485 3.3v
edited Feb 25 at 12:48
Peter Mortensen
1,60031422
asked Feb 25 at 4:48
scico111scico111
376111
edited Feb 25 at 12:48
Peter Mortensen
1,60031422
asked Feb 25 at 4:48
scico111scico111
376111
edited Feb 25 at 12:48
Peter Mortensen
1,60031422
edited Feb 25 at 12:48
Peter Mortensen
1,60031422
edited Feb 25 at 12:48
Peter Mortensen
1,60031422
1,60031422
asked Feb 25 at 4:48
scico111scico111
376111
asked Feb 25 at 4:48
scico111scico111
376111
asked Feb 25 at 4:48
scico111scico111
376111
376111
2
$begingroup$
Why is this question tagged with "3.3v"? How is this relevant?
$endgroup$
– Peter Mortensen
Feb 25 at 12:27
add a comment |
2
$begingroup$
Why is this question tagged with "3.3v"? How is this relevant?
$endgroup$
– Peter Mortensen
Feb 25 at 12:27
2
2
$begingroup$
Why is this question tagged with "
3.3v"? How is this relevant?$endgroup$
– Peter Mortensen
Feb 25 at 12:27
$begingroup$
Why is this question tagged with "
3.3v"? How is this relevant?$endgroup$
– Peter Mortensen
Feb 25 at 12:27
add a comment |
1 Answer
1
active
oldest
votes
$begingroup$
It doesn't matter as even if you're using a USART (which provides an additional CLK pin for synchronous operation) you'll only be using the UART part (RXD/TXD). Keep in mind that you'll need an additional pin for the Data Enable signal.
answered Feb 25 at 5:05
Tom L.Tom L.
6,70511228
$endgroup$
2
$begingroup$
If you use full-duplex RS485, then you don't need a data enable signal. You only need one for half-duplex RS485
$endgroup$
– Toor
Feb 25 at 5:36
3
$begingroup$
@Toor For practical purposes, RS-485 without data enable signal would be RS-422.
$endgroup$
– CL.
Feb 25 at 9:05
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
$begingroup$
It doesn't matter as even if you're using a USART (which provides an additional CLK pin for synchronous operation) you'll only be using the UART part (RXD/TXD). Keep in mind that you'll need an additional pin for the Data Enable signal.
answered Feb 25 at 5:05
Tom L.Tom L.
6,70511228
$endgroup$
2
$begingroup$
If you use full-duplex RS485, then you don't need a data enable signal. You only need one for half-duplex RS485
$endgroup$
– Toor
Feb 25 at 5:36
3
$begingroup$
@Toor For practical purposes, RS-485 without data enable signal would be RS-422.
$endgroup$
– CL.
Feb 25 at 9:05
add a comment |
$begingroup$
It doesn't matter as even if you're using a USART (which provides an additional CLK pin for synchronous operation) you'll only be using the UART part (RXD/TXD). Keep in mind that you'll need an additional pin for the Data Enable signal.
answered Feb 25 at 5:05
Tom L.Tom L.
6,70511228
$endgroup$
2
$begingroup$
If you use full-duplex RS485, then you don't need a data enable signal. You only need one for half-duplex RS485
$endgroup$
– Toor
Feb 25 at 5:36
3
$begingroup$
@Toor For practical purposes, RS-485 without data enable signal would be RS-422.
$endgroup$
– CL.
Feb 25 at 9:05
add a comment |
$begingroup$
It doesn't matter as even if you're using a USART (which provides an additional CLK pin for synchronous operation) you'll only be using the UART part (RXD/TXD). Keep in mind that you'll need an additional pin for the Data Enable signal.
answered Feb 25 at 5:05
Tom L.Tom L.
6,70511228
$endgroup$
It doesn't matter as even if you're using a USART (which provides an additional CLK pin for synchronous operation) you'll only be using the UART part (RXD/TXD). Keep in mind that you'll need an additional pin for the Data Enable signal.
answered Feb 25 at 5:05
Tom L.Tom L.
6,70511228
answered Feb 25 at 5:05
Tom L.Tom L.
6,70511228
answered Feb 25 at 5:05
Tom L.Tom L.
6,70511228
answered Feb 25 at 5:05
Tom L.Tom L.
6,70511228
6,70511228
2
$begingroup$
If you use full-duplex RS485, then you don't need a data enable signal. You only need one for half-duplex RS485
$endgroup$
– Toor
Feb 25 at 5:36
3
$begingroup$
@Toor For practical purposes, RS-485 without data enable signal would be RS-422.
$endgroup$
– CL.
Feb 25 at 9:05
add a comment |
2
$begingroup$
If you use full-duplex RS485, then you don't need a data enable signal. You only need one for half-duplex RS485
$endgroup$
– Toor
Feb 25 at 5:36
3
$begingroup$
@Toor For practical purposes, RS-485 without data enable signal would be RS-422.
$endgroup$
– CL.
Feb 25 at 9:05
2
2
$begingroup$
If you use full-duplex RS485, then you don't need a data enable signal. You only need one for half-duplex RS485
$endgroup$
– Toor
Feb 25 at 5:36
$begingroup$
If you use full-duplex RS485, then you don't need a data enable signal. You only need one for half-duplex RS485
$endgroup$
– Toor
Feb 25 at 5:36
3
3
$begingroup$
@Toor For practical purposes, RS-485 without data enable signal would be RS-422.
$endgroup$
– CL.
Feb 25 at 9:05
$begingroup$
@Toor For practical purposes, RS-485 without data enable signal would be RS-422.
$endgroup$
– CL.
Feb 25 at 9:05
add a comment |
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$begingroup$
Why is this question tagged with "
3.3v"? How is this relevant?$endgroup$
– Peter Mortensen
Feb 25 at 12:27