Re: Duplicate console output to a RS232C and keep keyb where it is

Richard B. Johnson
2001-08-03T13:03:32Z

On Fri, 3 Aug 2001, Frank Torres wrote:
>
> The RS232C is a serial port with 12V and there I have a BA63 20x4 display
> connected. (info worldwide)
> It is setted with the right speed, parity, etc. I use echo whatever
> >/dev/ttyS2 and it works.

It has probably been set okay after boot by `setserial` in some boot
script.

> If I use the command line parameter everybody says: (odd and 8 data bits is
> what I use)
> serial=2,9600o8
> console=ttyS2,9600o8 console=tty0

This is not valid. You cannot reasonably have parity and 8 bits. One
of them has to go. Either use 8 bits and no parity or 7 bits with
parity.

This is because there are 10 bits/baud. The "stop" bit is a timing
interval equal to one of these bits, between characters. Therefore, you
can have many stop bits, this just spaces the characters.

Cheers,
Dick Johnson

Penguin : Linux version 2.4.1 on an i686 machine (799.53 BogoMips).

I was going to compile a list of innovations that could be
attributed to Microsoft. Once I realized that Ctrl-Alt-Del
was handled in the BIOS, I found that there aren't any.