August 16, 2017, 08:56:33 PM

Author Topic: Enable non-admin users to access ttyUSB0  (Read 3965 times)

Offline Adventech

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Enable non-admin users to access ttyUSB0
« Reply #1 on: October 08, 2012, 11:52:18 PM »
PROBLEM:
How to enable USB to Serial adapter in Ubuntu 12.4.
Putty could not open port.
Enable non-admin users to access ttyUSB0.

SOLUTION:

Temp Work Around:
gksudo putty

FIX:
1.) Install the USB to Serial Adapter.
  • Wait for a couple of second, then run “dmesg”. You should see these message at the end of dmesg output.
usb 1-1: new full speed USB device using uhci_and address 2
usb 1-1: configuration #1 chosen from 1 choice

  • After that, unplug the device and type “lsusb”. You will see a list of output similar to this.
Bus 003 Device 001: ID 0000:0000
Bus 002 Device 007: ID 03f0:4f11 Hewlett-Packard
Bus 002 Device 006: ID 05e3:1205 Genesys Logic, Inc. Afilias Optical Mouse H3003
Bus 002 Device 004: ID 15d9:0a33

  • Plug in the USB-Serial Port converter back, and run “lsusb” again, and you shall see an additional line, like this.
Bus 003 Device 001: ID 0000:0000
Bus 002 Device 007: ID 03f0:4f11 Hewlett-Packard
Bus 001 Device 002: ID 4348:5523 --- --- --- (notice the additional line!)
Bus 002 Device 006: ID 05e3:1205 Genesys Logic, Inc. Afilias Optical Mouse H3003
Bus 002 Device 004: ID 15d9:0a33

  • Now we know the vendor id and the product id of the USB-Serial Port converter, this will enable us to load the linux kernel module “usbserial” to activate the device, like this :
sudo modprobe usbserial vendor=0x4348 product=0x5523
Run “dmesg” again and you shall see lines similar like this :

usbserial_generic 1-1:1.0: generic converter detected
usb 1-1: generic converter now attached to ttyUSB0
usbcore: registered new interface driver usbserial_generic

  • As you can see, the new serial port device is mapped to /dev/ttyUSB0. You can instruct Ubuntu to load this module automatically by include the line : “usbserial vendor=0×4348 product=0×5523″ inside “/etc/modules” file.

2.) You will need to add your user to the DIALOUT group
sudo adduser <the user you want to add> dialout
sudo reboot[/list]
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Bringing Integrity to Information Technology
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