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Usbserial /dev/ttyUSB recognized but not working

Posted: 2019/10/29 03:41:50
by before4

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[root@LAB1 ~]# lsusb |grep -i serial                                       
Bus 004 Device 003: ID 1a86:7523 QinHeng Electronics HL-340 USB-Serial adapter
from /dev directory listed as USB1 but from demsg connected to USB0

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[root@LAB1 ~]# ls -tlrh /dev/ttyUSB*                                       
crw-rw---- 1 root dialout 188, 0 Oct 29 10:31 /dev/ttyUSB1

[root@LAB1 ~]# dmesg |grep -i ttyUSB                                       
usb 4-12: generic converter now attached to ttyUSB0 

 
Using minicom command shown the terminal offline and not output

Re: Usbserial /dev/ttyUSB recognized but not working

Posted: 2019/10/29 12:24:37
by TrevorH
Check that you are looking at the right devices. I looked at my system and the device numbers given by lsusb.py match the device number in the dmesg output like this:

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$ lsusb.py | grep 0582
   3-13.4.3     0582:00e6 ff  1.10   12MBit/s 480mA 3IFs (Roland UA-25EX)
$ dmesg | grep "New USB "  | grep -i 0582
[    2.598030] usb 3-13.4.3: New USB device found, idVendor=0582, idProduct=00e6, bcdDevice= 1.01