Argonne National Laboratory

Experimental Physics and
Industrial Control System

1994  1995  1996  1997  1998  1999  2000  2001  2002  2003  2004  2005  2006  2007  2008  2009  2010  2011  2012  <20132014  2015  2016  2017  2018  2019  Index 1994  1995  1996  1997  1998  1999  2000  2001  2002  2003  2004  2005  2006  2007  2008  2009  2010  2011  2012  <20132014  2015  2016  2017  2018  2019 
<== Date ==> <== Thread ==>

Subject: Re: Linux USB serial questions
From: Andrew Johnson <anj@aps.anl.gov>
To: tech-talk@aps.anl.gov
Cc: Andrew Gomella <andrewgomella@gmail.com>
Date: Thu, 18 Apr 2013 17:12:45 -0500
Hi Mark,

On 2013-04-18 Mark Rivers wrote:
> I don't have a serious need for this device, but there is an EPICS user at
> NIH, Andrew Gomella who needs to control 18 of the model 3006 devices,
> which he is planning to do from a single Linux box.
> 
> Is this possible, even in kernel 3.8?

It should be possible even with your kernel version.  The issue that Guy 
described is that the driver can only talk to one *type* of device at once; so 
as long as all 18 are the same model 3006 with the same product ID he should 
be fine.

The other question is whether it provides a serial number attribute that can 
be used in a udev configuration file to ensure that the /dev/ttyUSB* nodes 
always map to the same physical devices. If there is no such attribute then 
unplugging 2 devices and plugging them back in could cause the mapping to 
change, which could be disastrous.  Of course managing all 18 units and 
replacing them with spares still becomes a rather complicated chore.

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

Replies:
Re: Linux USB serial questions Guy Jennings
References:
Linux USB serial questions Mark Rivers
Re: Linux USB serial questions J. Lewis Muir
RE: Linux USB serial questions Mark Rivers

Navigate by Date:
Prev: RE: Linux USB serial questions Mark Rivers
Next: Re: Linux USB serial questions J. Lewis Muir
Index: 1994  1995  1996  1997  1998  1999  2000  2001  2002  2003  2004  2005  2006  2007  2008  2009  2010  2011  2012  <20132014  2015  2016  2017  2018  2019 
Navigate by Thread:
Prev: RE: Linux USB serial questions Jim Chen
Next: Re: Linux USB serial questions Guy Jennings
Index: 1994  1995  1996  1997  1998  1999  2000  2001  2002  2003  2004  2005  2006  2007  2008  2009  2010  2011  2012  <20132014  2015  2016  2017  2018  2019 
ANJ, 20 Apr 2015 Valid HTML 4.01! · Home · News · About · Base · Modules · Extensions · Distributions · Download ·
· Search · EPICS V4 · IRMIS · Talk · Bugs · Documents · Links · Licensing ·