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Re: distance of pwm cable carrying seria data
RS-232 has distance vs. data rate charts. There's no specification I know of for the distance TTL-level serial data can travel reliably, especially without knowing the output characteristics of the devices at each end. My expectation is that 115kbps for six feet over the equivalent of ribbon cable ought to be just fine, unless there's a noise problem. Do you have motors running? Are there other wires running past the data lines?
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