Jerry Feldman wrote:
On Tue, 06 May 2008 15:53:43 -0400
James Knott <[EMAIL PROTECTED]> wrote:
Not quite. It's only 10. There's 8 data bits, one start and one stop
bit. Perhaps you're thinking of the old 5 level code, which could have
1, 1.42 or 1.5 stop bits. Also, ASCII at 110 b/s has 2 stop bits, for a
total of 11 bits/char sent.
It was 1.5 stop bits back in 1976 when we were integrating a 1200bps
modem into our POS system. I'm not talking about Baudot code. In any
case, 10 or 10.5, it does not really matter today :-). Today, with
advanced compression techniques and all sorts of protocols it's still
difficult to forecast what time download will take because the speeds
only pertain to a packet. With net traffic on both the server and the
client side, you could get anywhere from a cable modem high of 10Mbps
to only a few Kbps). It took me an entire night to download Ubuntu
Hardy Heron on my cable modem that usually measures about 4 to 6Mbps.
It was never 1.5 stop bits for ASCII devices. It was either 2 stop bits
at 110 b/s or 1 at 300 & above. It wouldn't hurt anything, other than
slightly slower throughput, to set your stop bits more than required
though. Take a look at the old hardware (I'm quite familiar with it, as
that was my job many years ago), or any UART spec and you won't find 1.5
stop bits used with ASCII. The two stop bits were required on the old
mechanical terminals of many years ago. Electronic terminals are quite
happy with one.
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