Jetson not detect /dev/ttyUSB0 using Unitek USB-RS232

Robotics & Edge Computing Jetson Systems Jetson Xavier NX
1

Hi everyone,
I have 2 seed studio jetson Xavier.
I installed jetpack 4.6 using SDKManager. When i connect USB-RS232 to USB port. It not detect /dev/ttyUSB0.

Here is the summary that I already did:
USB-RS232 : USB to Serial RS232 Cable

$lsusb
Bus 001 Device 003: ID 067b:23c3 Prolific Technology, Inc.

$lsmod
pl2303 15863 0

$ls /dev/tty*
no result on /dev/ttyUSBx

$ ls /dev/ttyUSB*
ls : cannot access ‘/dev/ttyUSB*’: No such file or directory

3

Hi,

What are you trying to do here? I mean what do you expect to do with this cable?

4

I want to send some string data to server.
my jetson send data from usb port and the server only have rs232 port for receive data.

I already install driver pl2303.ko(from Unitek website) using this command:
$sudo cp pl2303.ko /lib/modules/$(uname -r)/kernel/drivers/usb/serial

then, it can detect /dev/ttyUSB0.

but if i restart the jetson, dev/ttyUSB0 missing and i need to cp pl2303.ko again.

before this im using jetson developer kit and it work fine if I plug in the cable. Now this is seed studio jetson xavier, this issue not automatically detected the cable.

The problem is dev/ttyUSB0 not detect after jetson is restart

5

Hi,

I am not sure what does that mean you need to " cp pl2303.ko again".
There is no ghost there to remove this and cause it disappeared with no reason. I don’t think you really need to “cp it again”.

What you need to do is probably insmod it by yourself manually. Could you confirm that first?

6

Try running “sudo depmod -a”. Apparently the system just doesn’t know the file is there after a reboot. If that doesn’t work, then you may need a udev rule. This would be due to not loading the module, and not because the module is missing. Be very certain that reboot is really removing the file and not simply ignoring it (the two are very different errors, and load errors are trivial, while loss of a file is not).