Brian Lane wrote:
>
> On Sun, 8 Dec 1996 20:31:34 +0100, you wrote:
>
> >Hi.
> >
> >What would be the easiest way to have multiple 16C84's talk to the same
> >Max232?
> >I don't want to use PortB for this, so open drain configuration as
> >described in one of the Parallax Stamp application notes is out of the
> >question. At least as far as I can see.
> >It is crucial to use only one MAX232.
> >
> >
> >Would this work?
>
>   Maybe, but what about collision detection? If you have 2 processors
> running asynchronously they may tx over one another. If you add a
> control line between the networked parts, and tie all the outputs
> together you can then have all devices configure their output as an
> input, and when they want to send they pull the control line high
> (nidicating to the other processors that the max232 is now busy),
> switch the tx to an output and transmit, then switch back to an input
> and bring the control line back low.
>

IIC Multi Master mode (Look in the Embedded controller handbook)
--
Friendly Regards

Tjaart van der Walt
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