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"""
provide basic class to operate SCPI capable instruments
"""
import re
import logging
import time
logging.basicConfig(format='%(asctime)s %(levelname)8s %(name)s: %(message)s', datefmt='%m/%d/%Y %H:%M:%S')
logger = logging.getLogger('qolab.hardware.scpi')
logger.setLevel(logging.INFO)
def response2numStr(strIn, firstSeparator=None, unit=None):
# Often an instrument reply is in the form 'TDIV 2.00E-08S' (for example Siglent Scope)
# i.e. "<prefix><firstSeparator><numberString><unit>
# prefix='TDIV', firstSeparator=' ', numberString='2.00E-08', unit='S'
# this function parses the reply
if firstSeparator is None or firstSeparator == '':
return (strIn, None, None)
spltStr = re.split(firstSeparator, strIn)
prefix = spltStr[0]
rstr = spltStr[1]
if unit is not None and unit != '':
spltStr = re.split(unit, rstr)
numberString = spltStr[0]
unit = spltStr[1]
else:
numberString = rstr
return (prefix, numberString, unit)
class SCPI_PROPERTY(property):
"""
Overrides property class and makes it suitable for SCPI set and query notation.
Works within SCPIinstr class since it assumes that owner has query() and write().
scpi_prfx - SCPI command prefix to get/set property, for example 'FreqInt'
query formed as 'scpi_prfx?' and setter as 'scpi_prfx val'
ptype - property type 'str', 'int', 'float', ...
doc - short description of property, for example 'Internal lockin frequency'
no_getter - typical for some sort of command
no_setter - typical for measured values (i.e. external to the instrument)
tsdb_logging - logging to time series DB (True/False)
"""
def __init__(self, scpi_prfx=None, ptype=str, doc=None, no_getter=False, no_setter=False, tsdb_logging=True):
self.no_getter = no_getter
self.no_setter = no_setter
self.tsdb_logging = tsdb_logging
if no_getter:
fget=None
else:
fget = self.get_scpi
if no_setter:
fset=None
else:
fset = self.set_scpi
super().__init__(fget=fget, fset=fset)
self.scpi_prfx = scpi_prfx
self.ptype = ptype
self.__doc__ = doc
def __set_name__(self, owner, name):
self.public_name = name
self.private_name = '_' + name
def log_to_tsdb(self, owner, action=None, val=None):
if owner.tsdb_ingester is None or not self.tsdb_logging:
return
if owner.config['DeviceNickname'] is not None:
measurement=owner.config['DeviceNickname']
else:
measurement=owner.config['Device type']
ts = time.time()
ts_ms = int(ts*1000)
var_name = self.public_name
tags = {'action': action }
fields = {var_name: val}
try:
msg=f"{ts_ms=}, {measurement=}, {tags=}, {fields=}"
logger.debug(msg)
owner.tsdb_ingester.append(ts_ms, measurement=measurement, tags=tags, **fields)
except ValueError as err:
logger.error(f'{err=} in function {f.__name__}: {var_name} = {val}')
def get_scpi(self, owner):
val = self.ptype( owner.query(f'{self.scpi_prfx}?') )
self.log_to_tsdb(owner, action='get', val=val)
return val
def set_scpi(self, owner, val):
owner.write(f'{self.scpi_prfx} {val}')
self.log_to_tsdb(owner, action='set', val=val)
def __repr__(self):
sargs= []
sargs.append( f'scpi_prfx={self.scpi_prfx}')
sargs.append( f'ptype={self.ptype}')
sargs.append( f'doc={self.__doc__}')
sargs.append( f'no_getter={self.no_getter}')
sargs.append( f'no_setter={self.no_setter}')
sargs.append( f'tsdb_logging={self.tsdb_logging}')
sargs =', '.join(sargs)
s = ''.join( [ f'{self.__class__.__name__}(' , sargs, ')' ] )
return s
class SCPIinstr:
""" Basic class which support SCPI commands """
"""
Do not instantiate directly, use
rm = pyvisa.ResourceManager()
SCPIinstr(rm.open_resource('TCPIP::192.168.0.2::INSTR'))
"""
def __init__(self, resource):
self.resource = resource
# convenience pyvisa functions
self.write = self.resource.write
self.read = self.resource.read
self.query = self.resource.query
self.read_bytes = self.resource.read_bytes
self.read_binary_values = self.resource.read_binary_values
self.query_binary_values = self.resource.query_binary_values
@property
def idn(self):
return self.query("*IDN?")
def clear_status(self):
self.write("*CLS")
def set_event_status_enable(self):
self.write("*ESE")
def query_event_status_enable(self):
return self.query("*ESE?")
def query_event_status_register(self):
return self.query("*ESR?")
def set_wait_until_finished(self):
self.write("*OPC")
def wait_until_finished(self):
return self.query("*OPC?")
def reset(self):
self.write("*RST")
def set_service_request_enable(self):
self.write("*SRE")
def query_service_request_enable(self):
return self.query("*SRE?")
def query_status_byte(self):
return self.query("*STB?")
def self_test_result(self):
return self.query("*TST?")
def wait(self):
self.write("*WAI")
if __name__ == '__main__':
from qolab.hardware.basic import BasicInstrument
class DummyInstrument(BasicInstrument):
def __init__(self, *args, **kwargs):
super().__init__(*args, **kwargs)
# in order to check SCPI_PROPERTY we need to implement write and query
def write(self, str):
print(f'write: {str=}')
def query(self, str):
print(f'query: {str=}')
return '123'
x = SCPI_PROPERTY(scpi_prfx='SETX', ptype=str, doc='property X', tsdb_logging=False)
y = SCPI_PROPERTY(scpi_prfx='SETY', ptype=int, no_setter=True, doc='property Y')
z = SCPI_PROPERTY(scpi_prfx='SETY', ptype=int, no_getter=True, doc='property Z')
c1= DummyInstrument()
c1.deviceProperties=['x', 'y']
c1.getConfig()
c2= DummyInstrument()
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