> All RS232's use
> unipolar (ground referenced) voltages, not currents.


... actually BIPOLAR (as in + and -) voltages - but who's counting ...

RF Jim



----- Original Message -----
From: "Wouter van Ooijen" <wouter@VOTI.NL>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Wednesday, December 11, 2002 2:37 PM
Subject: Re: [EE] RS232 x RS232C


> > No, the first is +/- 12V and the second is 0/20mA (or
> > -20/+20mA - I do not
> > remember which). RS232C is used relatively seldom, especially in units
> > with galvanic separation (industrial stuff) because it can drive an
> > optocoupler directly and survive large potential differences
> > and noise.
>
> You are either drunk, forgot the ;)) or working very late, because this
> is total bullshit (and I'm not even Olinising). RS232 is a common name
> for RS232x, or sometimes for the original RS232. All RS232's use
> unipolar (ground referenced) voltages, not currents.
>
> Wouter van Ooijen
>

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