RS-485 using USART or UART port on STM32RS-485 / CAN signal levelsRS-485 isolation required?RS-485 Modbus...
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RS-485 using USART or UART port on STM32
RS-485 / CAN signal levelsRS-485 isolation required?RS-485 Modbus device to MCUSTM32 UART reliability with high baud rateUSB Specifications for PCB design.UART baudrate stepsCP2108 with level converter txb0108 - UART communication TTL and LVTTLUsing UART chip without programming control registersRepurposing FT232 UART pins as parallel outCan STM32F4 USART be used as UART?
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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 5 hours ago
Peter Mortensen
1,60031422
asked 13 hours ago
scico111scico111
356111
$endgroup$
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 5 hours ago
Peter Mortensen
1,60031422
asked 13 hours ago
scico111scico111
356111
$endgroup$
1
$begingroup$
Why is this question tagged with "3.3v"? How is this relevant?
$endgroup$
– Peter Mortensen
5 hours ago
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 5 hours ago
Peter Mortensen
1,60031422
asked 13 hours ago
scico111scico111
356111
$endgroup$
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 5 hours ago
Peter Mortensen
1,60031422
asked 13 hours ago
scico111scico111
356111
edited 5 hours ago
Peter Mortensen
1,60031422
asked 13 hours ago
scico111scico111
356111
edited 5 hours ago
Peter Mortensen
1,60031422
edited 5 hours ago
Peter Mortensen
1,60031422
edited 5 hours ago
Peter Mortensen
1,60031422
1,60031422
asked 13 hours ago
scico111scico111
356111
asked 13 hours ago
scico111scico111
356111
asked 13 hours ago
scico111scico111
356111
356111
1
$begingroup$
Why is this question tagged with "3.3v"? How is this relevant?
$endgroup$
– Peter Mortensen
5 hours ago
add a comment |
1
$begingroup$
Why is this question tagged with "3.3v"? How is this relevant?
$endgroup$
– Peter Mortensen
5 hours ago
1
1
$begingroup$
Why is this question tagged with "
3.3v"? How is this relevant?$endgroup$
– Peter Mortensen
5 hours ago
$begingroup$
Why is this question tagged with "
3.3v"? How is this relevant?$endgroup$
– Peter Mortensen
5 hours ago
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 13 hours ago
Tom L.Tom L.
6,66011227
$endgroup$
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
12 hours ago
2
$begingroup$
@Toor For practical purposes, RS-485 without data enable signal would be RS-422.
$endgroup$
– CL.
9 hours ago
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 13 hours ago
Tom L.Tom L.
6,66011227
$endgroup$
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
12 hours ago
2
$begingroup$
@Toor For practical purposes, RS-485 without data enable signal would be RS-422.
$endgroup$
– CL.
9 hours ago
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 13 hours ago
Tom L.Tom L.
6,66011227
$endgroup$
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
12 hours ago
2
$begingroup$
@Toor For practical purposes, RS-485 without data enable signal would be RS-422.
$endgroup$
– CL.
9 hours ago
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 13 hours ago
Tom L.Tom L.
6,66011227
$endgroup$
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 13 hours ago
Tom L.Tom L.
6,66011227
answered 13 hours ago
Tom L.Tom L.
6,66011227
answered 13 hours ago
Tom L.Tom L.
6,66011227
answered 13 hours ago
Tom L.Tom L.
6,66011227
6,66011227
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
12 hours ago
2
$begingroup$
@Toor For practical purposes, RS-485 without data enable signal would be RS-422.
$endgroup$
– CL.
9 hours ago
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
12 hours ago
2
$begingroup$
@Toor For practical purposes, RS-485 without data enable signal would be RS-422.
$endgroup$
– CL.
9 hours ago
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
12 hours ago
$begingroup$
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
12 hours ago
2
2
$begingroup$
@Toor For practical purposes, RS-485 without data enable signal would be RS-422.
$endgroup$
– CL.
9 hours ago
$begingroup$
@Toor For practical purposes, RS-485 without data enable signal would be RS-422.
$endgroup$
– CL.
9 hours ago
add a comment |
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$begingroup$
Why is this question tagged with "
3.3v"? How is this relevant?$endgroup$
– Peter Mortensen
5 hours ago