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Hi, If You ask about RS485 I assume that You want to communicate via Modbus RTU. In this case, with raspberry pi I prefer solution: Use usb/rs485 converter (like this https://www.amazon.com/JBtek-Converter-Adapter-ch340T-Supported/dp/B00NKAJGZM - it has drivers included into the kernel) or better - some industrial usb isolated usb/rs485 converter) To communicate with the PLC you have to know it's Modbus ID and registers addresses. What brand of PLC You want to communicate with? I use RPIs to communicate via rs485 with Power Meters and it works without problems. Best regards,

Solved.. Thank you all

Thank you