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The RS485 chip will reveal the proper sequence required of "DE & RE" - and your use of "spare" GPIO pins should meet that chip's requirements. Sometimes (often) line terminating resistors are required ...

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I am using the ISO3082 as Dual Isolated Half-Duplex RS485/TTL conversor. I am following the Reference Desing TIDU590, but on the TTL side I have a microcontroller which receives R, and D in a UART and ...