I would like to connect a pic (13c84) to the serial port.
The problem is that I don't want to use any battery and no converter
0/5v +12v/-12v.
I would like to use the line TX at the level (-12 v) and so I need to
put a regulator between TX and GND. But what about the other lines? How
can I obtain the correct protocol? It seems that a mouse works like that
(TX/GND -12v) but I can't find any schematic of a mouse...
Thanks for response.
petitj@esiee-amiens.fr