Are you using the devkit or custom carrier board?
Are you using TTL cable from USB port of your host PC to the UART pin on AGX Orin?
Do you enable HW flow control in your case?
ttyTHS1 seems the UART5 coming from M.2 Key E port.
Have you confirmed that you are using the correct UART interface?
Unable to correspond to "func" and "uart_tx" - #3 by KevinFFF