piclist 1995\12\08\202057a >
Thread: Direct RS-232 Connect
face BY : Eric Smith email (remove spam text)

Tony said:
>   110 Baud as a simple example in fact refered to the transmission of an
>  8 bit data field FRAMED with 1 start-bit, 1 stop-bit and 1 parity-bit

To which I replied:
> Correct so far.

Actually I didn't look closely enough at that.  110 baud as implemented on
the ASR 33 and other early ASCII Teletypes and similar equipment used:
       1 start bit
       7 data bits
       1 parity bit
       2 stop bits
for a total of 11 bits per character.

Some other contemporary equipment allowed the replacement of the parity bit
by an 8th data bit, so characters were still 11 bits.

Most (if not all) equipment operating at 300 bps or faster allow only require
the use of a single stop bit, so they only need 10 bits per character.  Thus
at 300 bps they can transmit 30 characters per second.


In reply to: <m0tO3xy-00024HC@goonsquad.spies.com> (message from Tony Grimer on Fri, 8 Dec 1995 11:21:39 0000)
See also: www.piclist.com/techref/io/serials.htm?key=rs%2D232
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