def get_model_name(address):
"""Physically queries the instrument model at the given address"""
from visa import VisaIOError
import visa
model = "no device"
try:
instr = visa.Instrument(str(address))
timeout = instr.timeout
except VisaIOError:
print("instrument at address " + str(address) + " didn't reply in "
"time...")
else:
try:
instr.timeout = 0.1
ret = instr.ask("*IDN?")
except (VisaIOError, TypeError):
print("instrument at address " + \
address + \
" didn't reply in time...")
else:
model = ret.split(",")[1]
model = model.replace(' ', '')
finally:
instr.timeout = timeout
return model
def __connectLAN(self, device):
"""connects to the rigol powersupply"""
if hasattr(visa, "instrument"):
self.__ip = device
self.__instr = visa.Instrument(self.__ip, term_chars='\n')
self.__instr.timeout = 2
else:
self.__ip = device
self.__instr = visa.ResourceManager().open_resource(device)
self.__instr.read_termination = '\n'
self.__instr.write_termination = '\n'
self.__instr.timeout = 2000
self.__instr.chunk_size = 4096
def connect(self):
"""
Make a connection to the device.
"""
log.info('Connecting to device "{0}" using {1} at "{2}".'.format(
self.name, self.driver, self.connection_resource))
if self.driver == drivers.pyvisa:
try:
self.device = visa.Instrument(**self.connection_resource)
except visa.VisaIOError as e:
raise DeviceNotFoundError(
'Could not open device at "{0}".'.format(
self.connection_resource), e)
elif self.driver == drivers.lgpib:
try:
self.device = Gpib.Gpib(**self.connection_resource)
except gpib.GpibError as e:
raise DeviceNotFoundError(
'Could not open device at "{0}".'.format(
self.connection_resource), e)
elif self.driver == drivers.pyvisa_usb:
try:
if not (legacyVisa):
rm = visa.ResourceManager()
self.device = rm.open_resource(**self.connection_resource)
else:
class USBDevice(visa.Instrument):
"""
Using USB devices with PyVISA requires a small hack: the object must be an Instrument, but we can't call Instrument.__init__.
"""
def __init__(self, *args, **kwargs):
# Bypass the initialization in visa.Instrument, due to "send_end" not being valid for USB.
visa.ResourceTemplate.__init__(
self, *args, **kwargs)
self.device = USBDevice(**self.connection_resource)
except visa.VisaIOError as e:
raise DeviceNotFoundError(
'Could not open device at "{0}".'.format(
self.connection_resource), e)
try:
self._connected()
except Exception as e:
raise DeviceNotFoundError(
'Could not finish connection to device at "{0}".'.format(
self.connection_resource), e)
def __connectLAN(self, device):
"""connects to the tektronix function generator"""
if hasattr(pyvisa, "instrument"): #old visa
self.__ip = device
self.__instr = visa.Instrument(self.__ip, term_chars='\n')
self.__instr.timeout = 2
else:
self.__ip = device
rm = visa.ResourceManager()
self.__instr = rm.open_resource(device)
self.__instr.read_termination = '\n'
self.__instr.write_termination = '\n'
self.__instr.timeout = 2000
self.__instr.chunk_size = 4096
def get_model_name(address):
"""Physically queries the instrument model at the given address"""
from visa import VisaIOError
import visa
model = "no device"
try:
instr = visa.Instrument(str(address))
timeout = instr.timeout
except VisaIOError:
print "instrument at address " + str(
address) + " didn't reply in time..."
else:
try:
instr.timeout = 0.1
ret = instr.ask("*IDN?")
except VisaIOError, TypeError:
print "instrument at address " + \
address + \
" didn't reply in time..."
else:
def test_itc4():
print("Test start")
itc4 = visa.Instrument("COM2", term_chars=b"\r", timeout=5)
itc4.write(b"V")
print(itc4.read())
print("Test end")
def __connectGPIB(self, device):
self.__instr = visa.Instrument(device)
def __init__(self, address='192.168.0.3', **kwargs):
import vxi11 as v
self.inst = v.Instrument(address)
Driver.__init__(self, **kwargs)
