Using serial Ports


I enable ttyO1 - ttyO5.

I try to send and receive, but no success.
I send:

echo "Hello" > /dev/ttyO1

With another Terminal I start before:

cat /dev/ttyO1

sending seems ok, now error.
receiving is waiting and waiting…

I close Pin 24 and 26 on P9 (TX to RX)

So, normaly I should receive on the same Port what I send, right?

Can someone help? Thank you!

OK, now it works … The loop on the same Port made Problems.
I send from ttyO1 to ttyO4 and it works