Jetson Xavier NX how to use the UART J14 port

Robotics & Edge Computing Jetson & Embedded Systems Jetson Xavier NX
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hello andresbeltc,

may I have your confirmation you’d working with NX or TX2?

for Jetson Xavier NX, it’s pin-3 and pin-4 respectively for UART Receive and Send of J14,
pin-3 and pin-4 were UART2_TXD,UART2_RXD / UART3_TX,UART3_RX =pin 236,238, the port is mapping to ttyTHS2.

please also access NX Developer Kit User Guide from download center for reference.
you might also also access NX Product Design Guide and check [Figure 11-5. Jetson Xavier NX UART Connections]

here’s similar discussion thread, Topic 145106 for your reference.
thanks