About Serial Interface in component J17

I want to use Serial Interface in component J17,as there is a Tx point and Rx point in Component J17.But I cannot recive data.I am sure is due to the board distribution,as I can recive data when using Tx point and Rx point in component J21.Thanks

hello SunXiang,

i think J17 UART port is working for TX1.

may i have your double confirm, thanks