Ahhhh..... (sorry for my stupid realisation-originated-question), for
the same serial-cable types with identical "idVendor" and "idProduct",
are they guaranteed to have unique serial-numbers?
We have the Prolific-PL2303-Serial-To-USB-converters with ID 067b:2303.
Right now I have two of these pieces, and they have identical 067b:2303, but
udevadm info -a -n /dev/ttyUSB0 | grep '{serial}' | head -n1
gives different serial-numbers for these two pieces.
Can I generalize this to any piece of the same cable-type?
If yes, I should be done :)
Either ways, thanks a ton Greg and Felipe for your prompt responses !!!
Thanks and Regards,
Ajay
On Tue, Sep 13, 2016 at 11:30 AM, Felipe Balbi
<[email protected]> wrote:
>
> Hi,
>
> Ajay Garg <[email protected]> writes:
>> Hi All.
>>
>> Till now, we had a single usb-serial-cable, that we needed to
>> associate to a static tty-name.
>> http://hintshop.ludvig.co.nz/show/persistent-names-usb-serial-devices/
>> worked perfect for our purpose (till now).
>>
>>
>> However, we now require that multiple "identical" usb-serial-cables be
>> inserted in our device, and we want to associate static tty-names to
>> slots, something like ::
>>
>> slot-1 ==> always /dev/ttyUSB0
>> slot-2 ==> always /dev/ttyUSB1
>>
>> and so on ...
>>
>> Since all slots will contain "identical" usb-serial-cables, so the
>> solution at
>> http://hintshop.ludvig.co.nz/show/persistent-names-usb-serial-devices/
>> (if I am not wrong) breaks.
>
> They should still have separate Serial Numbers, right? Anyway, it's not
> hard to find a device without Serial number.
>
>> So, is there a solution to our requirement (probably via udev-rules)?
>> If yes, I will be grateful to receive any pointers.
>
> You can use the symlinks in /dev/serial/by-path/. See if that's enough
> for you.
>
> --
> balbi
--
Regards,
Ajay
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