Short j12.4 with j12.6 Tx and Rx pins of UART

Login into device

Set the baudrate

[email protected]:~# stty -F /dev/ttymxc1 -echo -onlcr 115200

set tty port to ttymxc1 for UART2

[email protected]:~# cat /dev/ttymxc1 &
[1] 347

now transmit hello

echo hello > /dev/ttymxc1

hello must be received on terminal

[email protected]:~# hello