I am attempting to pass data through my serial port and see the result. I have added myself to the group for /dev/ttyS0 and run
cat < /dev/ttyS0
on one terminal for reading of data. To write I tried
echo -e '123' > /dev/ttyS0
The commands don't throw any errors, but I don't see any output on the first terminal. Any ideas on what I'm doing wrong?