> Actually, a proper RS232 driver has a guaranteed minimum source impedence,
> which would eliminate the need for the resistor. However, the resistor is
> _very_ cheap insurance.

But that referes to the RS232 side, and the transistor is on the other side!
But (re my earlier response) why use a transistor at all?

Wouter van Ooijen
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Van Ooijen Technische Informatica: http://www.voti.nl
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