Mike,

On Mon, 23 Aug 2004 15:12:30 +0100, Michael Rigby-Jones
wrote:

>...<

> You can use RS232 in a multidrop configuration by a
diodes in the TX line of
> every slave to prevent them loading each other.  It's
a bit of a bodge, and
> RS485 is certainly far superior.

Could you do the bodge with MAX232s involved?  I'd have
thought they would try to assert the + or - voltage
whatever happens, so which way would you connect the
diode?

(Having typed that I've just remembered that RS232
"idles" at -V, so perhaps you treat this as the base
state and anything trying to send would take it to +V ?
You'd have to have a pull-down on the wire somewhere, I
think?)

Cheers,


Howard Winter
St.Albans, England

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