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Control RS485 Half-Duplex with UART1(ttymxc0)

Question asked by HyunSuk Lee on Feb 26, 2020
Latest reply on Feb 27, 2020 by igorpadykov

Hello.

 

Custom board with imx6dl is based from SABREAUTO RDK board.

 

I want to control Half-Duplex Mode of RS485 with UART1(ttymxc0).

64.1.1 UART Features  of the datasheet described "RS-485 driver direction control via CTS_B signal".

 

 

MTXEN485(CTS_B) port set to high when transmit data out, in other case set to low.

 

Anyway I'm googling this,

normally connect RTS_B to direction control of 485 driver with SER_RS485_ENABLE|SER_RS485_RTS_ON_SEND options.

 

What is right to connect RS485 driver direction control to CTS_B or RTS_B ?

 

Thank you.

Regards,

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