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Manchester encoding might not allow you to selectively write to the shift register, in the separate clock and data approach you simply wouldn't send the clock. You need to think about how to selectively clcok your shift register. This doubles the bit-rate on the RS485, but you only need one signal pair so it eliminates the skew problem.Įdit: just to add to that. Personally I'd Manchester encode using a PIC at one end and Manchester decode with another PIC at the other, and use that end PIC to write the data to your shift register. If you are sending at 1Mbit/sec over a mile I would serioulsy look at an isolated RS485 topology.Īlso skew is between clock and data is probably going to cause a problem.
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