Experimental Physics and
Industrial Control System

Andrew Johnson <[email protected]> · 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

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System