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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:

    A commercial "modem data splitter" (serial sharing device) is $55.

    More about me:
    VB3/VB6/C/PowerBasic source code:
    Freeware for the Palm with NS Basic source code:
    Drivers for Pablo graphics tablet and JamCam cameras:
    Email here:
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