asynUSBTMC communications issue

["Dudley, David via Tech-talk" <tech-talk@aps.anl.gov>]

Mark,

 

I’m trying to use the asynUSBTMC driver to connect to some SCPI USB devices.  I’ve got a Keithley 3390 Waveform generator, a B&K 9130B Power Supply and a B&K 8600B Electronic load all connected by USB.

 

All of the units work properly with the supplied LabView extensions on my Windows system.

 

Using the Asyn driver however, I can send most any query function that I want and get a proper response.  Send a command (even something like *RST or *CLR), and the device reports an invalid termination character on the Keithley, and the B&K’s just fail to answer or lock up.

 

I’ve tried CR LF, CR, LF, NL as terminations, and they all provide the same problems.

 

Any ideas on where to start looking?

 

David Dudley Controls Engineer III Facility for Rare Isotope Beams Michigan State University 640 South Shaw Lane East Lansing, MI 48824-1321, USA Tel. 517-908-7133 Email: dudleyd@frib.msu.edu