On Tue, 06 May 2008 17:15:04 -0400 James Knott <[EMAIL PROTECTED]> wrote:
> 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. A half a bit is not anything to argue with, but at the time I was dealing with a modem manufacturer, but 1 and a half stop bits was what they used as a norm for serial ASCII communications. -- -- Gerald Feldman <[EMAIL PROTECTED]> Boston Computer Solutions and Consulting ICQ#156300 PGP key id: 537C5846 PGP Key fingerprint: 3D1B 8377 A3C0 A5F2 ECBB CA3B 4607 4319 537C 5846 --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
