If you're using NI-VISA then you probably need NI-488.2 GPIB driver, not
linux-gpib. Beware, however, NI-488.2 GPIB drivers do not work on Linux
with USB adapters - you'll need a PCI GPIB card.
Mat.
Mathew Maher
Simulation Team Leader
Surrey Satellite Technology Ltd
________________________________
From: [log in to unmask]
[mailto:[log in to unmask]] On Behalf Of
eigenroot
Sent: 24 May 2011 00:25
To: [log in to unmask]
Subject: Errors of instrument control with PyVISA in Scientific Linux
5.5
Hello everyone,
I would like to control a Keithley source meter with PyVISA in the lab.
The operating system is Scientific Linux 5.5, and the Python version is
2.4. I first installed NI-VISA's Linux package
(http://joule.ni.com/nidu/cds/view/p/id/2040/lang/en) which was
compatible with Scientific Linux 5, and then ctypes from
http://python.net/crew/theller/ctypes/ and linux-gpib from
http://linux-gpib.sourceforge.net/. After everything was done
successfully I fired up an interactive Python session, and typed
import visa
No errors. And then I typed
keithley = visa.instrument("GPIB::25")
but got errors:
Traceback (most recent call last):
File "<stdin>", line 1, in ?
File "/usr/lib/python2.4/site-packages/pyvisa/visa.py", line 287, in
instrument
interface_type, _ = \
File "/usr/lib/python2.4/site-packages/pyvisa/vpp43.py", line 777, in
parse_resource
byref(interface_board_number))
File "/usr/lib/python2.4/site-packages/pyvisa/vpp43.py", line 398, in
check_status
raise visa_exceptions.VisaIOError, status
pyvisa.visa_exceptions.VisaIOError: VI_ERROR_LIBRARY_NFOUND: A code
library required by VISA could not be located or loaded.
Could anyone please help? Thanks very much~!
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