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nucleu-h745zi-q rs485 without external module

MGH745
Associate II

Hello
//   nucleu-h745zi-q
I want to use hardware flow control rs485

Previously, i used an external module because there was only rs232 (f103).
** question ** . With this feature, can the module be removed and the microcontroller directly connected to A B receiver?

Mikael
4 REPLIES 4
Pavel A.
Evangelist III

No.

AScha.3
Principal III

Hi,

You need to connect a rs485 driver, thats all. And set a UART to 485-mode (thats capable to do this).

Something like DS485M (from Ti) .

look at mouser ... many :

https://www.mouser.de/c/semiconductors/interface-ics/rs-485-interface-ic/?q=rs485&instock=y&sort=pricing

 

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Thank you for your answer
I used to run rs485 easily without hardware flow control
I would like to know what difference will be made by adding this feature?

Mikael

The ST-LINK on the NUCLEO does not implement RS232 levels.

RS485 differential pairs need a transceiver, and a control signal to enable the driver. Direction rather than "flow" control

Perhaps RS422 where you have a separate pair for each of transmit and receive signals?

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