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splitting RS232

Discussion in 'Electronic Basics' started by Fritz Oppliger, Jul 14, 2004.

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  1. Yo-
    I want my 8051 gizmo to talk USB as well as RS232.
    I want to use a USB module that looks like a serial port on the USB side
    as well as on the 8051 side.
    It hooks into the TTL level signal coming from the 8051
    The now-existing connection feeds a MAX232.

    Question is, can the two talk / listen to the same lines? I don't need
    fancy arbitration but simply a way of keeping the MAX232 from blanking all
    traffic to/from the USB module and vice versa.
    Thanks for hints.
     
  2. the Wiz

    the Wiz Guest

    There are a number of commercial RS232 splitters (usually listen-only) that are
    done using diodes for isolation.

    There are some sample Y-cable diagrams here:
    http://www.control.com/1026145374/index_html

    A commercial "modem data splitter" (serial sharing device) is $55.
    http://www.bb-elec.com/product.asp?sku=232MDS&dept_id=129


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