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Serial Port Transmitting

Discussion in 'General Electronics Discussion' started by victor101, Oct 27, 2011.

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  1. victor101


    Oct 27, 2011
    I need to know when my pc is sending data to my printer. I have designed this circuit, is it safe to use? Don't want to blow up my pc or printer port.
    It seems to work ok.

    Attached Files:

  2. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    Jan 21, 2010
    Seems fine. I'd just replace the optocoupler with a regular red LED though.
  3. victor101


    Oct 27, 2011
    The other part of the opto goes to my PLC. It is either blinking or steady on to the plc input.
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