[time-nuts] controlling instruments using USB

Pete Lancashire pete at petelancashire.com
Mon Jul 25 22:36:59 EDT 2016

here is what the author has to say


On Mon, Jul 25, 2016 at 7:33 PM, Pete Lancashire
<pete at petelancashire.com> wrote:
> Never tried this Alien convert RPM to DEB
> https://www.howtoforge.com/converting_rpm_to_deb_with_alien
> On Mon, Jul 25, 2016 at 6:02 PM, jimlux <jimlux at earthlink.net> wrote:
>> Semi-off-topic..
>> I've got a bunch of Keysight/Agilent/HP instruments with USB interfaces that
>> I want to control from Python.  On Mac and PC, the PyVisa library works
>> great (either the one with the NI back end or the python only back end )
>> But, on Ubuntu, there's no way to install the NI drivers (RH install only,
>> and Ubuntu is debian..)
>> So, I've been doing usbtmc, which sort of works.  (after figuring out all
>> the udev rules stuff)
>> If I do something like this from the python interpreter:
>>>>> import usbtmc
>>>>> myinst = usbtmc.Instrument( mfr, product)
>>>>> myinst.write('some command')
>> it works fine.
>> But if I put the same three linesin a .py file and run it, it doesn't always
>> work.. sometimes, you need to send the command twice.
>> It seems it might be a timing thing (in libusb or usbtmc?) but putting some
>> sleep() in between connecting to the instrument and doing the write doesn't
>> seem to work all the time.
>> Very curious.
>> Any ideas?
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