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Author Topic: Linux Serial Communication Difficulty  (Read 547 times)
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Hi All,

I’m having some difficuly getting a machine running Debian to communicate with the Arduino UNO.  This application has absolutely no problems communicating with the Arduino Duemilanove through ttyUSB0.

When I connect the Arduino Duemilanove to the PC /dev will populate with ttyUSB0.

If I disconnect the Duemilanove and re-connect an Arduino UNO I do not see ttyUSB0 or ttyACM0…

Things I’ve tried:
•   I can connect to the UNO through Windows Vista so I know the Arduino works.
•   From my understanding the 8u2 USB to Serial IC uses usbcore - If I do a “lsmod” I can see usbcore running.
•   If I run the “lsusb” command I can see the UNO as: “Bus 002 Device 005: ID 2341:0001.

So why is /dev not populating with ttyUSB0 or ttyACM0 ?

Thanks!
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have you tried to run..

'sudo modprobe cdc_acm'. If that still won't work, show me your lsmod output. Maybe I can help. Good luck.
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I just had the same issue its cleared up by updating the firmware on the uno.
This post explains the process well -- > http://arduino.cc/forum/index.php/topic,38112.msg282438.html#msg282438
 smiley
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