@Marko-Lukat said in How can I pass one GPIO pin to an other?: @Radek Pin 16 and 17 (UART2) is connected AT_RX and AT_TX respectively. The UART2 doesn't work by the way. Let's take a step back. Just short pin 16/17 (jumper wire), start a terminal of your choice on /dev/ttyS2 (on the Omega), disable local echo and start typing. Do you see any response (i.e. remote echo)? root@Omega-5BE1:~# picocom -b 9600 /dev/ttyS2 picocom v1.7 port is : /dev/ttyS2 flowcontrol : none baudrate is : 9600 parity is : none databits are : 8 escape is : C-a local echo is : no noinit is : no noreset is : no nolock is : no send_cmd is : sz -vv receive_cmd is : rz -vv imap is : omap is : emap is : crcrlf,delbs, Terminal ready Yes, when I short GPIO16 and GPIO17 (UART2) with a jumper wire then I can see what I type... :-)