Experimental Physics and
Industrial Control System

Michael Davidsaver via Tech-talk <tech-talk at aps.anl.gov> · Wed, 1 Dec 2021 19:54:17 -0800

On 12/1/21 1:28 PM, Eric Norum via Tech-talk wrote:
> I wrote the USBTMC driver using the standard as a guide but there are lots of gray areas where I may have interpreted things incorrectly. And I’m no expert on the use of libusb…..
> If someone has a way to trace USB operations I’d be happy to work on the driver so that it produces the same output as the LabView extension.

fyi. Wireshark can capture arbitrary USB traffic.

https://wiki.wireshark.org/CaptureSetup/USB

>> On Dec 1, 2021, at 1:24 PM, Dudley, David via Tech-talk <tech-talk at aps.anl.gov <mailto:tech-talk at aps.anl.gov>> wrote:
>>
>> 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?
>>  
> 

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System