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Old 02-08-2008, 03:29 PM
Dave Smith
Default ttyUSB0 not appearing

Hi all,

Since an unplanned reboot yesterday, my USB<->RS232 adaptor is no longer
appearing as /dev/ttyUSB0.

dmesg shows the following when it's plugged in:

usb 2-2.1: USB disconnect, address 4
usb 2-2.1: new full speed USB device using uhci_hcd and address 5
usb 2-2.1: configuration #1 chosen from 1 choice
input: MCT Corp. Serial Mouse Adaptor as /class/input/input9
input: USB HID v1.10 Mouse [MCT Corp. Serial Mouse Adaptor] on

Similarly, it's entry in /proc/bus/usb/devices appears to be:

T: Bus=02 Lev=02 Prnt=02 Port=00 Cnt=01 Dev#= 5 Spd=12 MxCh= 0
D: Ver= 1.10 Cls=00(>ifc ) Sub=00 Prot=00 MxPS=16 #Cfgs= 1
P: Vendor=0711 ProdID=0231 Rev= 1.03
S: Manufacturer=MCT Corp.
S: Product=Serial Mouse Adaptor
C:* #Ifs= 1 Cfg#= 1 Atr=a0 MxPwr= 50mA
I: If#= 0 Alt= 0 #EPs= 1 Cls=03(HID ) Sub=01 Prot=02 Driver=usbhid
E: Ad=81(I) Atr=03(Int.) MxPS= 8 Ivl=8ms

Sadly, I don't know what it used to appear as, whether it's always been
treated as a "Serial Mouse Adaptor". In any case, I'm not using it for a
mouse, I'm using it to talk to a temperature sensor module, and so I need
to access it through ttyUSB0.

I haven't been able to find anything specific on google. Some posts
relating to other distributions have pointed to it maybe appearing under
/dev/tts/ but I don't have any such directory myself.

I'm using a fairly up to date install of Etch.

Many thanks in advance for any help,


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