Experimental Physics and
Industrial Control System

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

Subject:	asynUSBTMC communications issue
From:	"Dudley, David via Tech-talk" <tech-talk at aps.anl.gov>
To:	"tech-talk at aps.anl.gov" <tech-talk at aps.anl.gov>
Date:	Wed, 1 Dec 2021 21:24:33 +0000

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