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Author Topic: Getting USB to Serial to work  (Read 3748 times)
Mawrob
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« on: July 18, 2009, 08:43:16 PM »

I am running the updated jaunty linux and using a serialio usb to serial convertor http://serialio.com/products/adaptors/usb_serial.php

If I run lsusb I get:

root@debian:/# lsusb
Bus 001 Device 003: ID 067b:2303 Prolific Technology, Inc. PL2303 Serial Port
Bus 001 Device 001: ID 0000:0000

When I run usbserial I get

root@debian:/# sudo modprobe usbserial vendor=0x067b product=0x2303
FATAL: Could not load /lib/modules/2.6.22.18/modules.dep: No such file or directory

I seems I do not have the required files.  Any idea what they are and where I can find them?

Ubuntu noob.
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restamp
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« Reply #1 on: July 18, 2009, 10:21:39 PM »

FWIW, I'm using essentially the same hardware in a slightly different package (purchased here), but, lsmod has the same signature:
Code:
$ lsusb
Bus 001 Device 005: ID 0930:a002 Toshiba Corp.
Bus 001 Device 004: ID 067b:2303 Prolific Technology, Inc. PL2303 Serial Port
Bus 001 Device 003: ID 067b:2303 Prolific Technology, Inc. PL2303 Serial Port
Bus 001 Device 002: ID 2001:f103 D-Link Corp. [hex]
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
$
Here is my lsmod:
Code:
$ lsmod
Module                  Size  Used by
nfsd                  261016  9
exportfs                4364  1 nfsd
dm_crypt               14084  0
dm_mod                 59152  1 dm_crypt
pl2303                 18720  1
usbserial              32856  3 pl2303
$
(Note the pl2302 module!)  I'm using the 2.6.30-rc6 kernel that came with the Alpha 6 Sheeva Installer.  When I plug in one of these devices, it is correctly identified, usbserial and pl2303 automatically load, and the /dev/ttyUSB* devices are automatically created.  Prior to loading this kernel, I observed that the original OS that came with my Plug did not know how to deal with these devices.  It looks to me, from the FATAL you posted, that you are using something akin to the initial load -- 2.6.22.18.  I can't tell you how to make these devices work with that load, but I believe if you upgrade using the Alpha-6 installer, it will resolve your USB-to-serial problem.

Good luck!
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Mawrob
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« Reply #2 on: July 20, 2009, 07:03:02 AM »

Thanks for the tip.  I guess I need to take the leap.
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Mawrob
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« Reply #3 on: July 21, 2009, 07:49:45 AM »

Whew!  The alpha-6 update seemed to work and I now see /dev/ttyUSB0 when I plug in my USB to serial adapter.  Need to do further testing but thank you for the advice.
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