LE>> particularly impressive. Actually there was an interesting
LE>> discussion here (or zone3_tech?) about the fact that RS232
LE>> is NRZ, so therefore doesn't have a "baud rate" per se
LE>> possibly.
IS> RS232 is Non Return to Zero?  I don't believe so.  As far as I know, it's 
IS> straight 0 (start bit), data bits as they come, then 1 (stop bit), per 

Yes, that's NRZ as I understand it. For example, suppose (ignoring framing)
we had to send 11001. This would translate to :

        1     1     0     0     1
+12V ------------+           +------
  0V             |           |
-12V             +-----------+


If it was a RTZ signal, then each bit would be identifiable by a period on
either side of the data area which was at 0V, thus :

        1     1     0     0     1
+12V   +-+   +-+               +-+
  0V --+ +---+ +---+ +---+ +---+ +--
-12V               +-+   +-+

So with the NRZ version, the receiving entity has to know or have some
other way to work out the time-spacing of the bits to make sense of the
waveform it's receiving, whereas with the RTZ version of the signal, the
clock speed of the waveform can be identified by the 0V segments.

-- Lewin A.R.W. Edwards [Team OS/2]  Tel 0419320415 * 0412809805 * 0414927056
@EOT:

--- MsgedSQ/2 3.35