How to SERIAL port

Forum: Linux
Topper 
Anyone know how to use serial ports (uart) under linux os on ARM board?

The COM2 -> /dev/??? doesn't respond!

Thanks!

open-nandra 
Please search forum before posting. There is a lot of information already.
UART1 is /dev/ttySAC0.

thanks,
marek

Topper 
... and this port works fine.

I could read the output from my pc using a hyperterminal.

For this thing I put [CODE 1] into /etc/inittab
and  [mknod /dev/ttySAC0 c 204 64] at system start

But to manage COM1 and COM2 (to send command to an other gadget) directly
from ARM linux so which is the procedure?

??? echo "something" > /dev/ ... not work

[CODE 1]
...
1:2345:respawn:/sbin/getty 38400 tty1
2:23:respawn:/sbin/getty 38400 tty2
3:23:respawn:/sbin/getty 38400 tty3
#4:23:respawn:/sbin/getty 38400 tty4
#5:23:respawn:/sbin/getty 38400 tty5
#6:23:respawn:/sbin/getty 38400 tty6

T0:23:respawn:/sbin/getty -L ttyS0 38400 vt100
T1:23:respawn:/sbin/getty -L ttySA0 38400 vt100
T2:23:respawn:/sbin/getty -L ttyS1 38400 vt100
T3:23:respawn:/sbin/getty -L ttySA1 38400 vt100

# Example how to put a getty on a serial line (for a terminal)
#
#T0:23:respawn:/sbin/getty -L ttyS0 9600 vt100
#T1:23:respawn:/sbin/getty -L ttyS1 9600 vt100

# Example how to put a getty on a modem line.
#
#T3:23:respawn:/sbin/mgetty -x0 -s 57600 ttyS3
SA0:12345:respawn:/sbin/getty -L ttySAC0 115200 vt100

#USR MY
#ttySAC0::respawn:/sbin/getty -L ttySAC0 115200 vt100 # GENERIC_SERIAL
#ttySAC1::respawn:/sbin/getty -L ttySAC1 9600 vt100 # GENERIC_SERIAL
[/CODE1]

open-nandra 
e.g.: http://friendlyarm.net/forum/topic/1893

Topper 
RESOLVED:

SORRY  :)))

/dev/ttySAC1 works at 9600B

but FRIENDLY ARM and a DEVICE are DEVICES and the cable is think for PC

(PC) SERVER - CLIENT (ARM)   ==> (ARM) CLIENT - CLIENT (OTHER DEVICE)


Solution: switch the pins on cable!