Re: Thorlabs USB Hardare with EPICS

[Eric Norum <eric@norum.ca>]

The ASYN serial port code issues reads and writes at the lowest level so that should work.  The trick is to get all the termios stuff out of the way, which isn't that easy since the termios VMIN/VTIM stuff is used for handling read timeouts.   Do you know if the '/dev/usbtmcxxxx' devices support poll()?   

On Aug 21, 2013, at 10:08 AM, "Sorgenfrei, Florian" <florian.sorgenfrei@helmholtz-berlin.de> wrote:

Hi,

we were able to improve the situation a little bit. It looks like the native usbtmc support is broken since kernel  2.6.28-11. We installed the driver from Agilent
on our Debian 3.2.46-1 x86_64 machine and now we have /dev/usbtmc0 which returns information about the connected devices and /dev/usbtmc1 ... usbtmc16. With the latter we can now repeatedly communicate
 using echo (for example 'echo *IDN?>/dev/usbtmc1') and cat with the device and we get meaningful results. However, using the serial driver from asyn does not work, I guess since it is not
a pure serial device but rather a normal file in the linux file system where you can write to and read from.

Is there any possibility to get this working with asyn or do we have to find a new solution?

Cheers,

Flo

-- 
Eric Norum
eric@norum.ca