I guess that depends on how much speed you want. Techniques like this work fine up to 19.2K or so. Which is what the OP was asking to do, as I recall.
I generally just use a max232 chip and live with all of its warts. -Chuck Harris [email protected] wrote:
But do you get the speed In a message dated 7/26/2013 10:41:02 A.M. Eastern Daylight Time, [email protected] writes: I have enclosed a sketch of the usual way of using opto's to make an RS232 like interface. I haven't spent much time thinking, so I am sure that I have a few things backwards, but you should get the gist of how it is done. It is only RS232 like because it has only a single threshold. -Chuck Harris
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