TX2 NX UART1 communication problem

I’m working in our custom carrier board with TX2 NX SOM.When I test the RS232 connection,the ttyTHS3 of TX2 NX can’t send and receive messages, but other serial ports can work. After I changed the device tree according to other blogs, it still hasn’t been resolved.Have you ever encountered this kind of problem?
We used these pins:

Hello @chen.xi

This @JerryChang’s post will help you


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I modified it according to this content, and also tried it according to other blogs with similar problems. After modifying the device tree, when I used Cutecom to loop back and self-test, ttyTHS3, namely UART1, still could not receive the messages sent out.I tried to turn off the serial console, but it was still not solved.