USB to Serial Connection Only works once

When I plug in a USB i can found the TtyACM0 device and use python to read serial data. But It can only work once. After I restart python program it didn’t work anymoe.
I have tried to close the connection and then reopen, clear cache etc. Neither works. The only way is to re-plug USB.

How to fix this Issue? Thanks!

Hi zlfengyi,

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

Do you want to get the serial console log from Jetson Nano?
Or you want to communicate with your serial device connected on your board?

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