CentOS: No /dev/ttyUSB

chris24300 · 08-05-2009, 10:11 AM

Hi, I'm using CentOS 2.6.19.1 and I'm going to be talking over the USB port in the future. When I navigate to /dev/ I cannot see a ttyUSB, only tty## (numbers) and ttyS#. Someone else updated my machine to a newer version but I'm not sure if that is the cause of the conflict. Is there something I need to do to enable it? Please help!

Thanks,
Chris

michaelk · 08-05-2009, 11:14 AM

Not enough information provided.
Can I infer that you currently do not have any device plugged into the USB port?
Are you using a USB - serial port adapter or some other piece of equipment that emulates a serial port?
Post the output of the lsusb command. This will provide us with what type/chipset of the device that is connected.
If your device is supported udev should create the appropriate /dev/ttyUSB# device.

chris24300 · 08-05-2009, 11:36 AM

I have devices plugged into a few USB ports such as my mouse, keyboard, phone charger, etc. I am going to be using an external device that will be communicating over the USB and the script that was provided with it executes a program with /dev/ttyUSB0 as a parameter.

Code:

[root@c ~]# lsusb
Bus 001 Device 001: ID 0000:0000  
Bus 001 Device 007: ID 187c:0511  
Bus 001 Device 008: ID 187c:0511  
Bus 002 Device 007: ID 0fca:8004 Research In Motion, Ltd. 
Bus 002 Device 001: ID 0000:0000  
Bus 002 Device 006: ID 046d:c227 Logitech, Inc. 
Bus 002 Device 004: ID 046d:c223 Logitech, Inc. G15 Keyboard / USB Hub
Bus 002 Device 003: ID 1532:000c Razer USA, Ltd 
Bus 002 Device 002: ID 0d9f:0002 Powercom Co., Ltd 
Bus 002 Device 005: ID 046d:c226 Logitech, Inc.

michaelk · 08-05-2009, 11:49 AM

When you plug the device into the computer all of the modules should load and a /dev/ttyUSB0 device should be automatically be created. You should not have to enable anything. At the moment you do not have a problem.

Post back when you actually do plug it in. Can you provide us any details on this external device?

chris24300 · 08-05-2009, 12:29 PM

Oh, I see. I'm still new to Linux and understanding how it works. I thought it was going to be like the serial ports where there is always a ttyS0-3. I didn't want to start turning things on before I was able to locate everything I needed. It's there now, thanks!

Chris