I have a Keithley 2701 DMM and I am trying to communicate with it via TCPIP using python 2.7 and pyVISA. I am running python 2.7 with virtualenv and wxPython. I know the device is active because I can ping the IP address, I am trying to access the machine using the following code:
from pyvisa.vpp43 import visa_library
visa_library.load_library("/Library/Frameworks/Visa.framework/VISA")
import visa import instrument
Keithley = visa.instrument("TCPIP::192.168.0.2::INSTR")
when I run the code I get the following error:
Traceback (most recent call last):
File "Keithley.py", line 4, in <module>
Keithley = visa.instrument("TCPIP::192.168.0.2::INSTR")
File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/PyVISA-1.4-py2.7.egg/pyvisa/visa.py", line 294, in instrument
return Instrument(resource_name, **keyw)
File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/PyVISA-1.4-py2.7.egg/pyvisa/visa.py", line 358, in __init__
"lock")))
File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/PyVISA-1.4-py2.7.egg/pyvisa/visa.py", line 132, in __init__
keyw.get("lock", VI_NO_LOCK))
File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/PyVISA-1.4-py2.7.egg/pyvisa/vpp43.py", line 753, in open
byref(vi))
File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/PyVISA-1.4-py2.7.egg/pyvisa/vpp43.py", line 398, in check_status
raise visa_exceptions.VisaIOError, status
pyvisa.visa_exceptions.VisaIOError: VI_ERROR_RSRC_NFOUND: Insufficient location information or the requested device or resource is not present in the system.
Any help will be greatly appreciated....
V
I have not played with this particular DMM, but I have connected to several other devices using your same setup.
1) Check your documentation / DMM to ensure that the board number is in fact zero. Otherwise you'll need to change the following line:
Keithley = visa.instrument("TCPIP::192.168.0.2::INSTR")
To something more like
Keithley = visa.instrument("TCPIP1::192.168.0.2::INSTR")
2) Try to use a raw SOCKET connectional rather than the typical INSTR method.
If I can dream up anything else I will update my response.