[GreenKeys] Precise baud timing

Windows XD antech6586856 at gmail.com
Wed Nov 12 13:40:30 EST 2025


I really think its an issue with the board not being fast enough to decode
the serial inputs, I'm gonna mess with the settings to see if I can
optimize the code.

On Wed, Nov 12, 2025, 1:32 PM Harold Hallikainen via GreenKeys <
greenkeys at mailman.qth.net> wrote:

>
>
> On Wed, November 12, 2025 10:41 am, Jim Cooper wrote:
> > On 12 Nov 2025 at 9:45, Harold Hallikainen via GreenKeys
> > wrote:
> >
> >
> >> However, if the printer loses sync,
> >> it seems like the 31 ms stop bit allows the printer to resync more
> quickly
> >> than a 22 ms stop bit.
> >
> > Exactly right.   The 22ms stop bit was
> > mostly used by Western Union, who figured it would increase data
> throughput
> > by a significant percentage on heavily used circuits.
> >
> > The longer stop bit assures that the shaft comes
> > to a rotational stop and WAITS for the next start bit.
> >
> > w2jc
>
> Thanks! With a 22 ms stop bit, I'd expect the shaft to stop rotating and
> wait 11 ms to start rotating on the next start bit. If the stop bit is 31
> ms, I think the shaft would wait 20 ms before starting rotation again on
> the leading edge of the next start bit. Of course, when hand typing, the
> "stop bit" can be any length of at least 22 ms.
>
> Harold
> https://w6iwi.org
>
>
>
> --
> https://w6iwi.org
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