Re: [gentoo-user] Writing to tty01 (serial port) in simple straight forward way...?!?

[Francisco Ares]

2014-10-12 19:22 GMT-03:00 Paul Colquhoun <paulcol@×××××××××××××××××.au>:

>  On Sun, 12 Oct 2014 16:42:22 Kerin Millar wrote:
>
> > On 12/10/2014 13:08, meino.cramer@×××.de wrote:
>
> > > Hi,
>
> > >
>
> > > I want to send commands to ttyO1 (serial port on an embedded system).
>
> > > The commands are one line each and terminated with CRL/LF (aka "DOS").
>
> > >
>
> > > Since this will be done from a batch script, it should be possible
>
> > > via commandline tools and non-interactively. The serial port is
>
> > > already setup up the right way.
>
> > >
>
> > > I tried
>
> > >
>
> > > echo -n"blablabal\x0a\x0d"
>
> >
>
> > Firstly, this command is missing the -e switch. Secondly, the order of
>
> > the control characters is wrong. I would suggest the use of printf as it
>
> > has fewer pitfalls.
>
> >
>
> > # printf '%s\r\n' "command"
>
> >
>
> > --Kerin
>
>
>
>
>
> Also, are you sure that the standard output of the script is connected to
> the serial port? Try adding "> /dev/tty01" to the end of the echo/printf
> command lines and see if that helps.
>
>
>
>
>
> --
>
> Reverend Paul Colquhoun, ULC. http://andor.dropbear.id.au/
>
> Asking for technical help in newsgroups? Read this first:
>
> http://catb.org/~esr/faqs/smart-questions.html#intro
>
>
>

Or, perhaps, /dev/ttyS0 , or even /dev/ttyUSB0, if it is connected through
a USB to serial adapter.

By using this approach, you might be able to send a command, but most
probably (never tried) will not be able to receive the device's reply.

Try minicom, a simple text serial console.

Good luck
Francisco