In message  <Pine.BSI.3.95.971013123730.20073A-100000@ns.hicom.net>
 PICLIST@MITVMA.MIT.EDU writes:
> On Mon, 13 Oct 1997, Dave Gilinsky wrote:
>
> > On Mon, 13 Oct 1997, Mattias Engstrvm wrote:
> >
> > > I'm wondering if there is an easy way to convert RS232 output to levels
> > > suitable for
> > > a PIC. Like perhaps stripping the negative voltage with a diode and
> > > running the remainder through a transistor or something?
> > >
> >
> > Take a look at www.maxim-ic.com.  Maxim makes a wide range of RS232 line
> > driver/receivers.  I frequently use the MAX233 - single +5v supply and no
> > external components.
>
> The MAX232 or Dallas 232A are fine.  They have 2 send and 2 receive and
> need about 4 charge capas, 1.0uF, and a decoupling cap.  There are others
> that have more send and/or receive channels.
>

Another one to look out for is the MAX3232. This has an extended vcc
range: 2.5V to 5.5V IIRC in tests I had it and a C71 sending data to
a PC at under 2V.


Regards,


Mike Watson