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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$begingroup$


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







share|improve this question











$endgroup$








  • 1




    $begingroup$
    Why is this question tagged with "3.3v"? How is this relevant?
    $endgroup$
    – Peter Mortensen
    5 hours ago
















2












$begingroup$


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







share|improve this question











$endgroup$








  • 1




    $begingroup$
    Why is this question tagged with "3.3v"? How is this relevant?
    $endgroup$
    – Peter Mortensen
    5 hours ago














2












2








2





$begingroup$


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







share|improve this question











$endgroup$




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






share|improve this question















share|improve this question













share|improve this question




share|improve this question








edited 5 hours ago









Peter Mortensen

1,60031422




1,60031422










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














  • 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










1 Answer
1






active

oldest

votes


















5












$begingroup$

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.






share|improve this answer









$endgroup$









  • 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











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1 Answer
1






active

oldest

votes








1 Answer
1






active

oldest

votes









active

oldest

votes






active

oldest

votes









5












$begingroup$

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.






share|improve this answer









$endgroup$









  • 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
















5












$begingroup$

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.






share|improve this answer









$endgroup$









  • 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














5












5








5





$begingroup$

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.






share|improve this answer









$endgroup$



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.







share|improve this answer












share|improve this answer



share|improve this answer










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














  • 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


















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