[linux] serial device communication

[Doug McLean]

This is going to sound kind of dumb, but maybe instead of cat /dev/ttyS0,
maybe you should try minicom instead?  HOpefully that makes a difference.
:)

Doug McLean
CSS Systems Administrator
University of Washington, Bothell
http://staff.washington.edu/dougmc/pgp.html

Meanwhile, in Gotham, michael philetus weller wrote:

> hi,
>
> I am running slackware 9 and attempting to communicate with a serial
> device over /dev/ttyS0. for testing I have plugged a female-female serial
> cable between my serial port and a windows box running a terminal program.
>
> I can write to the serial port, for example if I say:
>
>   $ echo hi > /dev/ttySO
>
> 'hi' prints out on the windows machine terminal no problem.
>
> however, I cannot seem to read from it. if I say:
>
>   $ cat /dev/ttyS0
>
> and then go and send some stuff from the windows terminal, I get nothing,
> the linux terminal just hangs.
>
> maybe I have my serial port setup wrong? here are the port settings from:
>
>   $ stty -a --file /dev/ttyS0
>
> speed 9600 baud; rows 0; columns 0; line = 0;
> intr = ^C; quit = ^\; erase = ^?; kill = ^U; eof = ^D; eol = <undef>;
> eol2 = <undef>; start = ^Q; stop = ^S; susp = ^Z; rprnt = ^R; werase = ^W;
> lnext = ^V; flush = ^O; min = 1; time = 0;
> -parenb -parodd cs8 hupcl -cstopb cread clocal -crtscts
> -ignbrk -brkint -ignpar -parmrk -inpck -istrip -inlcr -igncr -icrnl -ixon
> -ixoff -iuclc -ixany -imaxbel
> opost -olcuc -ocrnl -onlcr -onocr -onlret -ofill -ofdel nl0 cr0 tab0 bs0
> vt0
> ff0
> isig icanon iexten -echo echoe echok -echonl -noflsh -xcase -tostop
> -echoprt
> echoctl echoke
>
> any suggestions?
>
> thanks,
>
> mike weller
> philetus at u...
>