Can i isolate my pic from my pc's noise by using 2 optocouplers and
>powering the serial comms from the serial port as in the schematic?
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Might work, bot not guaranteed. This circuit requires your serial port voltage levels to be some
9 volt. They often are, but can be as low as 5 volt. If your PC is a laptop, it is not likely to work at all.If you have the option: an ethernet port on your PIC would be a far better solution.