howto read from serial port?
alan at lxorguk.ukuu.org.uk
Mon Jun 20 17:05:07 UTC 2011
On Mon, 20 Jun 2011 08:45:02 -0700
Mike Wright <mike.wright at mailinator.com> wrote:
> Hi all,
> This sure feels like a blast from the past :)
> I'm trying to figure out how to use com ports to communicate between two
> fedora boxes.
> I've figured out how to set the flow rate (stty /dev/ttyS0 115200) and
> to send data: I have an 80k text file that I "cat textfile >
> /dev/ttyS0" and by measuring the TX pin I see the voltage change from
> -11.34v to +4.4v for about 10 seconds. Seems to be working.
> The problem comes on the other end of the wire. The receiving machine
> is connected by a "null modem" cable. It seems that standard
> redirection should work but I can't figure out the proper shell syntax.
> Input should listen to /dev/ttyS0 and whenever something is received be
> sent to /dev/stdout
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