USB to Serial assignemts?

[Jeffrey Ross]

Mikkel L. Ellertson wrote:
> Jeffrey Ross wrote:
>   
>> Mikkel L. Ellertson wrote:
>>     
>>> Jeffrey Ross wrote:
>>>       
>>>> How does Fedora assign which USB to serial adapter is assigned
>>>> /dev/ttyUSB0, /dev/ttyUSB1 etc through a reboot?
>>>>
>>>> I basically want to make sure that one specific USB adapter remains at
>>>> one location throughout a reload and unfortunately the on board serial
>>>> port doesn't work (hardware problem)
>>>>
>>>> Thanks..Jeff
>>>>
>>>>         
>>> I believe it assigns them in the order it finds them when scanning
>>> the bus. Changing where the adapter is plugged in, ro plugging in
>>> another serial device can change that. You may want to consider
>>> creating a udev rule that creates a symlink to that serial adapter
>>> with a meaningful name. I do this with the serial adapter for my
>>> GPS. (Actually, this is my old rule. I am working on having it tell
>>> gpsd that it was added/removed, and supporting more then one
>>> device.) If you have more then one device with the same vender and
>>> product ID, you can also test the serial number.
>>>
>>> KERNEL=="ttyUSB*", SYSFS{idVendor}=="067b",
>>> SYSFS{idProduct}=="aaa0", SYMLINK+="gps"
>>>
>>> Mikkel
>>>       
>> Since I have two of these USB to serial adapters made by the same
>> manufacture
>> I guess the serial number is going to be the way to go, and I like the
>> symlink
>> idea, makes sense and is easy enough to implement in my scripts.
>>
>> The device according to "lsusb -v" shows the following (among a lot of
>> other stuff):
>>
>>  idVendor           0x050d Belkin Components
>>  idProduct          0x0109 F5U109/F5U409 PDA Adapter
>>  bcdDevice            1.02
>>  iManufacturer           1 Belkin USB PDA Adapter
>>  iProduct                2
>>  iSerial                 3 799020
>>
>>
>> If I understand correctly I would create a file in /etc/udev/rules.d say
>> /etc/udev/rules.d/serialusb an put the following lines:
>>
>> KERNEL=="ttyUSB*", SYSFS{idSerial}=="799020",
>> SYSFS{idProduct}=="0109", SYMLINK+="serial"
>>
>> The next time the device was inserted into the USB port udev would create
>> the mapping so that /dev/serial was always this adapter.
>>
>> Did I get it right?
>>
>> Thanks!
>>
>> Jeff
>>
>>     
> It looks right. I would put it a local rules file - something like:
> /etc/udev/rules.d/10-local.rules
>
> Mikkel
>   

took a little bit... created the following in 
/etc/udev/rules.d/10-local.rules:

BUS=="usb", SYSFS{serial}=="799020",KERNEL=="ttyUSB*", 
SYMLINK+="serial", GROUP="uucp"