Discussion about UART connectivity issue with M.2 Key J18 header in Jetson Nano Developer Kit

I’m encountering an issue while attempting to utilize the UART functionality of the M.2 Key J18 header pins on the Jetson Nano. I’ve connected the UART RX, TX, and GND pins of the M.2 key header to a USB TTL converter on my Windows PC. Subsequently, I’ve launched Minicom on the Jetson Nano, configuring the serial port as THS2, and initiated a serial connection using PuTTY on the PC side. Despite this setup, I’ve observed that data transmission between Minicom and PuTTY is unsuccessful. Additionally, I’ve experimented with other serial ports including THS1, S0, S1, S2, and S3 but still facing same issue which data transmission and reception is unsuccessful. I’m seeking guidance on resolving this issue.

Hi haribalakumarp,

Are you using the devkit or custom board for Jetson Nano?
What’s your Jetpack verison in use?

Could you share the full dmesg for further check?

Thank you for your reply. I’m using devkit and the jetpack version is 5.1.1

Jetson Nano not support with JP5.1.1.
Are you using Orin Nano devkit?

Please share the result of the following commands on your board.

$ cat /etc/nv_tegra_release
$ cat /etc/nv_boot_control.conf

It seems you are using Jetson Nano with Jetpack 4.6.1 (L4T R32.7.1).

Is your issue about /dev/ttyTHS2 not working as expected?
Please also share the full dmesg for further check.