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Posted by IM Confused, on Dec-2008,
1. Bit banging
I am confused. A Tx line idles at -15v. When a byte is to be sent, the Tx line goes high (+15v) for the start bit, followed by the data (1=-15v, 0=+15v) sent least significant bit first, followed by the stop bit (-15v). Note that the stop bit doesn't exist, it is just a gap to allow things to syncronize.
 
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