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ISO3082: ISO3082 working in single direction

Part Number: ISO3082


I am using ISO3082DWG4 for my RS485 circuit. In that, We define chip characteristics in .dts file as per below.

After that, when we establish connection between module and laptop below observation is noted.

Observation: Once we established connection successfully and start sending data using my laptop(running terminal application) to our RS485 module(running cutecom application), we are able to receive data until sending anything from module to laptop. Once we send anything from module to laptop after that we are not getting anything from laptop to board. Also we change voltage between ground and direction pin before any sending from module to laptop is 0V and once we send then getting continuous 3.3V supply on direction pin.

  • Please check my dts file configuration.

    &uart1 {
    pinctrl-names = "default";
    pinctrl-0 = <&pins_uart1>;
    rs485-rts-delay = <0 0>;
    rts-gpios = <&pctl 10 GPIO_ACTIVE_HIGH>;
    status = "okay";

    pins_uart1: pins_uart1 {
    sppctl,pins = <

  • Hi Tech,

    Thank you for posting, and welcome to E2E! The ISO3082 is like a buffer in the physical layer, so ensure the delay between enabling the ISO3082 driver and receiver are respectively accounted for per datasheet specs in Section 6.11 and 6.12.

    Since communication issues like this are usually related to the protocol, the RS-485 module vendor should be able to provide the necessary support here. Please also contact them and let us know if there are any follow-up questions. 

    Thank you,
    Manuel Chavez

  • Hi Tech,

    Hopefully you are well. Have you been able to reach out to the RS-485 module vendor regarding this concern?

    Please let us know if there are any updates.

    Thank you,
    Manuel Chavez

  • Hi Tech,

    Hopefully you have been able to resolve this concern regarding your RS-485 module and ISO3082. Since there has not been a reply in six days, this thread will be closed. Feel free to reply or create a new thread using the red and yellow buttons in the upper right corner of this window.

    Thank you,
    Manuel Chavez