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Post# A1090676

RS485 Standard Secrets (Trier Weismark-Feyen)

Posted on: Wednesday, 22 May, 2024  07:07
Updated On: Wednesday, 22 May, 2024  07:11
Expires On: Tuesday, 16 February, 2027  14:07
Reply to: (Not Shown)
A signal traveling down the wires will reach the end and "reflect" off of it (at the receiver's end).
When an RS-485 driver gets its data directly from a UART (with no added inversion), you would expect the "A" and "B" wires to match the voltages in the RS-485 standard for the voltages on the wires, but they will not (unless the driver inverts its input).

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