Non-standard Baud rate
Non-standard Baud rate
(OP)
Does anyone know of a way to read information coming into a comm port at a non-standard baud rate, specifically 20833.333 baud? I've downloaded a few of the suggested programs, including comport toolkit. However, it does not seem to function properly at the non-standard rate.
Any suggestions?
Any suggestions?





RE: Non-standard Baud rate
You can't read it using COM-port for
the clock frequency the PC uses is not divisible
with your baudrate but
1.) You could build a special hardware and write
some software to it
2.) Under some condition you could use the parallel
port as input and emulate the UART in software only
3.) Or you could modify an off the shelf interface card
I would have to know more about the problem to go into more
details.
<nbucska@pcperipherals.com>
RE: Non-standard Baud rate
RE: Non-standard Baud rate
A rate of 20833.333 b/s gives a 48 uSec time periord for a bit.
nearest standard rate is 19200 b/s wich gives a 52.08333 uSec time period.
the shifting after 9 bits (Start bit + 8-bit data) will be 36.75 uSec, because the oscilator could drift under or upper frecuecy by a +/- 1%, so under favaorable circunstances (oscilator dont drift down) you could read the data using 19200 baud rate.
RE: Non-standard Baud rate
I knowk that this is imposible with a common pc serial port because the cristal clock port is 1,8432 Mhz and my decimal divisor exactly 2,329043 ~ 2 to get 57600 baud.
I just need to evaluate this option:
1.) You could build a special hardware and write
some software to it >>> knowk some one? maybe a pic?
2.) Under some condition you could use the parallel
port as input and emulate the UART in software only >>> it´s really possible at this baud rate.
3.) Or you could modify an off the shelf interface card >>> not apply to my case.
Best Regards
RE: Non-standard Baud rate
Ill post if the device works for my project.