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<== Date ==> <== Thread ==>

Subject: Re: Linux USB serial questions
From: Andrew Johnson <anj@aps.anl.gov>
To: tech-talk@aps.anl.gov
Date: Thu, 18 Apr 2013 14:40:08 -0500
Hi Mark,

On 2013-04-18 Mark Rivers wrote:
> I then tried to run modprobe for the new device:
> >sudo modprobe ftdi_sio vendor=0x104d product=0x3000

The modprobe command merely tells the Kernel 'please make sure this module 
(driver in your case) is loaded'.  Once it has been loaded issuing the 
modprobe command again won't have any effect (unless it gets unloaded first, 
which won't necessarily happen immediately that you unplug the first USB at 
which point the driver is no longer needed, although eventually with no 
devices connected the kernel might realize this and throw it out 
automatically).

> There is still only device ttyUSB0, not a new ttyUSB1.
> 
> What am I doing wrong?

I don't know for sure, but there has to be a way to tell the driver that a new 
device has been plugged in.  I would normally expect the udev mechanism to do 
that, so you might find the answer by reading the document that Eric pointed 
to.

- Andrew
-- 
It is difficult to get a man to understand something, when his salary
depends upon his not understanding it. -- Upton Sinclair

References:
Linux USB serial questions Mark Rivers
RE: Linux USB serial questions Mark Rivers

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