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'RS232-opto'
1998\02\01@070002 by Mike DeMetz

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While looking at the schematic of a Heathkit I noticed their
interesting opto isolated RS232 interface (receive only).
TX from PC is connected through a 3.3K resistor to the anode of
the opto's LED. Cathode in connected to gnd. A reverse diode is
hooked accross the LED. Output of opto is standard NPN, this is
inverted.

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