Writing pins to the RS232

[Ian Vincent]

Peter Hansen <peter at engcorp.com> wrote in
news:mailman.1278.1133183983.18701.python-list at python.org: 
> 
> All true, but then Jay might get into electrical compatibility issues,
> and may not realize that the output levels of RS-232 serial hardware
> are not simply 0 and 5V levels, but rather +9V (or so) and -9V (and
> with variations from 6V up to 13V seen in the wild), and without much
> in the way of drive capability.  Using this to control custom hardware
> would probably be an exercise in frustration and kind of pointless in 
> comparison to using parallel hardware, which at least has more typical
> logic voltage levels.

You can get ICs that convert RS232 to TTL voltage levels.