I want to get a screen capture from Agilent E4440A PSA series spectrum using Python with PyVISA, but I had the VI_ERROR_TMO timeout error. The following are my code.
import visa
rm = visa.ResourceManager()
rm.list_resources()
inst = rm.open_resource('TCPIP0::192.168.100.3::inst0::INSTR')
inst.timeout = 60000
inst.read_termination = None
inst.write(":DISPlAY:DATA?")
data = inst.read_raw()
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "C:\Python27\lib\site-packages\pyvisa-1.8-py2.7.egg\pyvisa\resources\messagebased.py", line 306, in read_raw
chunk, status = self.visalib.read(self.session, size)
File "C:\Python27\lib\site-packages\pyvisa-1.8-py2.7.egg\pyvisa\ctwrapper\functions.py", line 1582, in read
ret = library.viRead(session, buffer, count, byref(return_count))
File "C:\Python27\lib\site-packages\pyvisa-1.8-py2.7.egg\pyvisa\ctwrapper\highlevel.py", line 188, in _return_handler
raise errors.VisaIOError(ret_value)
pyvisa.errors.VisaIOError: VI_ERROR_TMO (-1073807339): Timeout expired before operation completed.
I tried to use other command as the following, but it had the same problem.
inst.timeout = 60000
inst.read_termination = None
inst.write("HARDCOPY:FORMat GIF")
inst.write("HARDCOPY:INKSAVER OFF")
inst.write("HARDCOPY:LAYout LANdscape")
inst.write("HARDCOPY:PORT ETHERNET")
inst.write("HARDCOPY START")
data = inst.read_raw()
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "C:\Python27\lib\site-packages\pyvisa-1.8-py2.7.egg\pyvisa\resources\messagebased.py", line 306, in read_raw
chunk, status = self.visalib.read(self.session, size)
File "C:\Python27\lib\site-packages\pyvisa-1.8-py2.7.egg\pyvisa\ctwrapper\functions.py", line 1582, in read
ret = library.viRead(session, buffer, count, byref(return_count))
File "C:\Python27\lib\site-packages\pyvisa-1.8-py2.7.egg\pyvisa\ctwrapper\highlevel.py", line 188, in _return_handler
raise errors.VisaIOError(ret_value)
pyvisa.errors.VisaIOError: VI_ERROR_TMO (-1073807339): Timeout expired before operation completed.
Can anyone help me? The following is Agilent E4440A information.
Firmware Revision: A.11.21 RELEASE
Revision Date: Jun 19 2012 10:29:48