> 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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