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Parallel switch project ?

Discussion in 'General Electronics' started by R.H., May 14, 2004.

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  1. R.H.

    R.H. Guest

    I have need for a parallel switch device which takes two parallel
    cables; one to hook to one of 6 printers and one to control which
    printer is selected. Now, I was able to build such a device with 245
    Octal transciever ICs, but they do not allow for bidirectional data
    movement. I was wondering if there is such an IC which is similiar
    which would work with bi-directional printers. Oh, though I could use a
    network system, I need to do this in DOS from a C++ program and not in

  2. Roger,

    To do bidirectional data transport you need a parallel printer port that is
    able to handle this in the first place. As you have to program it yourself,
    you will also need to know how the printerport distinguishes between sending
    and receiving. Usually one line is used as a R/W line.

    The 245 octal transceivers are perfectly equiped for bidirectional data
    movement. That's where the "Direction" pin is meant for. You really need to
    study the datasheet of this chip if you want to build circuits with it.

    petrus bitbyter
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