Alan B. Pearce wrote:
> >However, what do you do if the lines can have different
>>voltages and won't tolerate a high series impedance (>10 Ohms)?
>
> You mean apart from why you need such flexibility ... ??

:-)


> I guess you could use something like a bunch of DG201 type multiplexors,
> provided you kept things like the RS232 lines within +/-12V. Using 
> suitable
> series TVS clamps should be able to limit input voltage excursions enough 
> to
> protect them.

100 Ohms Drain-Source resistance is about 10 times greater than what is 
acceptable for this application.

Vitaliy 

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