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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



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.