def write(self, query):
""" writes a query to remote device
Arguments:
query -- (string) the query which shall be sent
"""
gpib.write(self.device, query + self.term_chars)
def get_mkr_amp(self):
"""Get marker amplitude
Return marker value in dBm
"""
gpib.write(self.device, "MA")
result = gpib.read(self.device, 8)
return float(result)
def set_center_freq(self, center_freq):
"""Set center frequency
Keyword arguments:
center_freq -- Center frequency in Hz
"""
cmd = "CF" + str(center_freq) + "HZ"
gpib.write(self.device, cmd)
return()
def set_span(self, span):
"""Set span
Keyword arguments:
span -- Span in Hz
"""
cmd = "SP" + str(span) + "HZ"
gpib.write(self.device, cmd)
return()
def set_rbw(self, rbw):
"""Set resolution bandwidth
Keyword arguments:
rbw -- RBW in Hz
"""
cmd = "RB" + str(rbw) + "HZ"
gpib.write(self.device, cmd)
return()
def set_vbw(self, vbw):
"""Set video bandwidth
Keyword arguments:
vbw -- VBW in Hz
"""
cmd = "VB" + str(vbw) + "HZ"
gpib.write(self.device, cmd)
return()
def set_ref_level(self, ref_level):
"""Set reference level
Keyword arguments:
ref_level -- Reference level in dBm
"""
cmd = "RL" + str(ref_level)
gpib.write(self.device, cmd)
return()
def set_mkr_freq(self, mkr_freq):
"""Set marker frequency
Keyword arguments:
mkr_freq -- Marker frequency in Hz
"""
cmd = "MKF" + str(mkr_freq) + "HZ"
gpib.write(self.device, cmd)
return()
def write(self, cmd):
while True:
status = ord(gpib.serial_poll(self.dev))
#print '.',
if status & Poll.COMMAND_DONE != 0:
break
elif status & Poll.OUTPUT_READY != 0:
raise PARWriteError("Data is ready, can't write")
gpib.write(self.dev, cmd)
def get_power(self,
filename='test_save_file_',
PLOT=False,
typ='BYTE',
SAVE=False):
print "ACQUIRING..."
#gpib.write(self.scope,'*IDN?')
gpib.write(self.scope, 'POWER?')
self.data = gpib.read(self.scope, 1000)
print "CHEERS!!!"
return self.data
def write(self, str, calls=0):
try:
gpib.write(self.id, str)
self.last_write = str
except gpib.GpibError:
if calls == 2:
Logging.error("Unrecoverable error. Please reboot")
raw_input("Press ENTER when done.")
exit(1)
self.reset()
self.write(str, calls=calls + 1)
def write(self, str, calls=0):
try:
gpib.write(self.id, str)
self.last_write = str
except gpib.GpibError:
if calls == 2:
Logging.error("Unrecoverable error. Please reboot")
raw_input("Press ENTER when done.")
exit(1)
self.reset()
self.write(str, calls=calls + 1)
def meas():
gpib.write(dc1, 'MEAS:CURR?')
s = gpib.read(dc1, 1000)
global t0
if t0 is None:
t0 = datetime.datetime.now()
t = datetime.timedelta(0)
else:
t = datetime.datetime.now() - t0
print('{}.{:06d},{}'.format(t.seconds, t.microseconds,
s.decode().rstrip()))
sys.stdout.flush()
def setV(self,c,v):
i_meas = 0
v_meas = 0
if(c != self.curchan):
self.curchan=c
msg="INST:NSEL " + str(self.curchan)
if(self.debug):
print(msg)
else:
gpib.write(self.pm2812,msg)
msg = "VOLT " + str(v)
if(self.debug):
print(msg)
else:
gpib.write(self.pm2812,msg)
time.sleep(0.5)
gpib.write(self.pm2812,"MEAS:VOLT?")
time.sleep(0.1)
v_meas=gpib.read(self.pm2812,100)
v_meas = float(v_meas.rstrip())
if(self.negative):
v_meas = -v_meas
gpib.write(self.pm2812,"MEAS:CURR?")
i_meas=gpib.read(self.pm2812,100)
i_meas = float(i_meas.rstrip())
time.sleep(.5)
return([v_meas,i_meas])
def off(self):
gpib.write(self.smiq, ':FREQ:MODE?')
answer = gpib.read(self.smiq, 256)
if answer == 'LIST':
gpib.write(self.smiq, ':FREQ:MODE CW')
gpib.write(self.smiq, ':OUTP OFF')
gpib.write(self.smiq, '*WAI')
def __init__(self, sad=0, timeout=13, send_eoi=1, eos_mode=0, debug=False, reset=False, interfaces=[]):
if os.geteuid() != 0:
Logging.error("You need to have root privileges to run this script.")
self.started = False
exit(1)
self.debug = debug
self.reset = reset
self.devices = {}
self.started = True
self.drivers = {}
# We go through each driver and look at the attribute DEVICES which contains all devices the driver should be loaded for.
for i in dir(Drivers.GPIB):
if i[0] != "_" and i != "GenericDriver":
driver = getattr(Drivers.GPIB, i)
if hasattr(driver, "DEVICES"):
self.drivers.update(driver.DEVICES)
if self.debug: Logging.info("Drivers for following devices have been loaded: %s" % self.drivers)
self.reset_usb_controller()
# Interface ids are used to determine which usb connections need to be reset
# Example:
"""
Bus 001 Device 006: ID 3923:709b National Instruments Corp. GPIB-USB-HS
"""
self.interfaces = ["3923:709b", "0957:0518"] + interfaces
self.reset_interfaces()
progress_bar = ProgressBar(30)
discovered = {}
for pad in range(0, 31):
id = gpib.dev(0, pad, sad, timeout, send_eoi, eos_mode)
try:
driver_avaliable = False
gpib.clear(id)
gpib.write(id, "*IDN?")
device_id = gpib.read(id, 1024).rstrip()
for i in self.drivers:
if i in device_id:
self.devices[pad] = self.drivers[i](GPIBCommunicator(id, self.reset_interfaces), device_id)
driver_avaliable = True
if not driver_avaliable:
self.devices[pad] = Drivers.GPIB.GenericDriver.GenericDriver(GPIBCommunicator(id, self.reset_interfaces), device_id)
discovered[id] = device_id
except gpib.GpibError:
pass
progress_bar.update(pad)
for i in discovered:
Logging.header("%s on %s" % (discovered[i], i - 16))
Logging.success("Discovery finished successfully!")
def write(self, command, keep_open=False, **kwargs):
"""Format string and send it to the device
Depending on the connection the command string can be send directly
to the device or has to formatted first.
Args:
command (str): Command that is send to the device
keep_open (bool, optional): Keep port open at the end
"""
if self._backend == "usbtmcWR":
keep_open = True
self._open()
if self._backend == 'pySerial':
if not self._port.is_open:
self._open()
self._port.write(
bytes('{0}{1}'.format(command, self._write_termination),
'utf-8'))
elif self._backend == 'pyVISA':
self._port.write(command)
elif self._backend == 'linux-gpib':
gpib.write(self._port, command)
elif self._backend == 'pyDAQmx':
self._port = Task()
self._port.CreateDOChan(self._connection['port'], "",
DAQmx_Val_ChanForAllLines)
self._port.StartTask()
self._port.WriteDigitalLines(1, 1, 10.0, DAQmx_Val_GroupByChannel,
command, None, None)
self._port.StopTask()
elif self._backend == 'file':
try:
with open(self._port, "w") as writer:
writer.write(str(command))
except OSError as error_object:
self.log.warning(error_object)
elif self._backend in ['usbtmc', 'usbtmcWR']:
self._port.write('{0}{1}'.format(command, self._write_termination))
elif self._backend == 'vxi11':
self._port.write(command)
elif self._backend == 'modbus':
modbus_write(self._port, command, **kwargs)
if not keep_open:
self._close()
def scanGpib(board):
if not has_gpib:
warnings.warn(
"Linux-GPIB is not available. ScanGpib with VISA not implemented at the moment.",
RuntimeWarning,
stacklevel=2,
)
else:
for pad in range(1, 31):
listen = gpib.listener(board, pad)
# print(board, pad, listen)
if listen:
print("GPIB" + str(board) + "::" + str(pad))
try:
ud = gpib.dev(board, pad, 0, 10, 1, 0)
if ud > 0:
gpib.write(ud, "*CLS;*IDN?")
description = gpib.read(ud, 256)
print(description.strip().decode("ascii"))
except Exception:
pass
def update(self):
"""
updates the DMM;
set the mode variable appropriately:
0 = returns DMM to the local display (voltage)
1 = DMM display in TORR
2 = DMM display in buffer gas density
"""
# read voltage
self.V = float(gpib.read(self.dmm, self.__bytes__))
self.torr = (self.V - self.calib[0])\
* (self.atm/(self.calib[1]-self.calib[0]))
# read temperature
self.Tsensor.write('CDAT?\n')
self.T = float(self.Tsensor.readline())
# calculate density. 100^3 necessary to bring the density to
# 1/cm^3 that we are used to.
self.dens = (self.torr * self.pascalPerTorr) / \
(1000000 * self.boltzmann * self.T)
if self.mode == 2:
gpib.write(self.dmm, "D2%.4E %s\r\n" % (self.dens,self.BGUnit))
elif self.mode == 1:
gpib.write(self.dmm, "D2%.5f %s\r\n" % (self.torr,self.unit))
elif self.mode == 0:
gpib.write(self.dmm, "D1\n")
def hpsetV(self,v):
gpib.write(self.hp6633a ,"VSET " + str(v))
time.sleep(0.5)
gpib.write(self.hp6633a,"VOUT?")
time.sleep(0.1)
v_meas=gpib.read(self.hp6633a,100)
v_meas = float(v_meas.rstrip())
gpib.write(self.hp6633a,"IOUT?")
time.sleep(0.1)
i_meas=gpib.read(self.hp6633a,100)
i_meas = float(i_meas.rstrip())
return(v_meas,i_meas)
def __init__(self,
query=None,
command=None,
FORCE=False,
filename=None,
SAVE=True):
### establish GPIB communication ###
self.scope = gpib.dev(0, 05)
#gpib.write(scope,'ZERO')
#gpib.write(scope,'ZERO?')
#gpib.read(scope,1000)
### establish settings ###
# gpib.write(self.scope,'ZERO')
gpib.write(self.scope, 'Filter FAST')
gpib.write(self.scope, 'RANGE:AUTO 1')
gpib.write(self.scope, 'WAVE 980')
if query: # to execute command from outside
print '\nAnswer to query:', query
self.write(query + '\n')
rep = self.read()
print rep, '\n'
sys.exit()
elif command:
self.command = command
print '\nExecuting command', self.command
self.scope.write(self.command)
print '\n'
sys.exit()
if filename:
self.amp = self.get_power()
### TO SAVE ###
if SAVE:
temp = C.getoutput('ls').splitlines() # if file exist => exit
for i in range(len(temp)):
temp_filename = filename + 'fpm8210'
if temp[i] == temp_filename:
print '\nFile ', temp_filename, ' already exists, change filename or remove old file\n'
sys.exit()
f = open(filename + '_fpm8210', 'w') # Save data
f.write(self.data)
f.close()
def setlist(self, freqlist, powerlist, dt=0.010, adt=0.001):
freqliststring = ', '.join(np.char.mod('%d', freqlist))
powerliststring = 'dBm, '.join(np.char.mod('%d', powerlist))
gpib.write(self.smiq, ':FREQ:MODE CW')
gpib.write(self.smiq, ':FREQ '+str(np.mean(freqlist)))
gpib.write(self.smiq, ':POW '+str(np.mean(powerlist))+'dBm')
gpib.write(self.smiq, '*WAI')
gpib.write(self.smiq, ':LIST:DELETE:ALL')
gpib.write(self.smiq, ':LIST:SELECT \'MINION\'')
gpib.write(self.smiq, ':TRIG1:LIST:SOURCE SINGLE') # single trigger an liste
gpib.write(self.smiq, ':LIST:MODE AUTO') # liste einmal durchfahren
gpib.write(self.smiq, ':LIST:DWELL '+str(dt+adt))
gpib.write(self.smiq, ':LIST:FREQ '+freqliststring)
gpib.write(self.smiq, ':LIST:POW '+powerliststring)
print('list set')
counterbins = res.to_bytes(2, byteorder='little')
counter.write(b'B'+counterbins) #SetNumberOfTriggeredCountingBins
triggermask = 8
triggerinvertmask = 8
counter.write(b'M'+(8).to_bytes(1, byteorder='little')) #SetTriggerMask
counter.write(b'Q'+(8).to_bytes(1, byteorder='little')) #SetTriggerinvertedMask
counter.write(b'K'+(1).to_bytes(4, byteorder='little')) #SetTriggeredCountingBinRepetitions
counter.write(b'0') #ResetTriggeredCountingData
counter.write(b'R') #EnableTriggeredCounting
test = 0
try:
gpib.write(smiq, '*RST') # nicht jedes mal machen - nur bei programmstart
time.sleep(0.1)
gpib.write(smiq, ':FREQ '+str(np.mean(freqlist)))
gpib.write(smiq, ':POW '+str(np.mean(powerlist))+'dBm')
gpib.write(smiq, ':LIST:DELETE:ALL')
gpib.write(smiq, ':LIST:SELECT \'CWODMR\'')
gpib.write(smiq, ':TRIG1:LIST:SOURCE SINGLE') # single trigger an liste
gpib.write(smiq, ':LIST:MODE AUTO') # liste einmal durchfahren
gpib.write(smiq, ':LIST:DWELL '+str(dt+adt))
gpib.write(smiq, ':LIST:FREQ '+freqliststring)
gpib.write(smiq, ':LIST:POW '+powerliststring)
def write(self, str):
gpib.write(self.id, str)
def rango(self, ra):
cc = gpib.write(self.equipo, "R" + ra)
def write(self, data: str):
gpib.write(self._handle, data)
def initialise_device(handle): # set up device to assert SRQ/RQS
gpib.write(handle, "*CLS") # Clear status registers
gpib.write(handle, "*SRE 32") # Assert SRQ on Event
return
def write(self, str):
gpib.write(self.id, str)
def query(handle, command, numbytes=100):
gpib.write(handle, command)
time.sleep(0.1)
response = gpib.read(handle, numbytes)
return response
# EXCLUDE ALL COMMENTED LINES
for line in cflines:
if line == '':
continue
elif line[0] == '#':
continue
else:
commands.append(line)
# IMPORT NEEDED MODULES
import gpib
# OPENING GPIB DEVICE (LASER)
herring = gpib.find("laser")
# SENDING COMMANDS TO DEVICE
for comm in commands:
gpib.write(herring, comm)
# DISPLAY SETTINGS
print('========================')
print(' NEW SETTINGS ')
print('========================')
for comm in commands:
gpib.write(herring, comm.split()[0] + ' ' + comm.split()[1])
print(
str(gpib.read(herring, 1024)).replace('b\'', '').replace('\\r\'', ''))
print('========================')
################################################################################
def liston(self):
gpib.write(self.smiq, ':OUTP ON')
gpib.write(self.smiq, ':LIST:LEARN')
gpib.write(self.smiq, ':FREQ:MODE LIST')
gpib.write(self.smiq, '*WAI')
import gpib, time, sys
from datetime import datetime
path = '.'
ncycle = 100000
nmeas = 10
interval = 60 #secondo
microampere = 1.e6
index = 0
#connect to picoammeter
picoam = gpib.find("picoammeter")
#initialize
print('initialize picoammeter')
gpib.write(picoam, "*RST") #reset settings
gpib.write(picoam, "SYST:ZCH ON") #zero check
gpib.write(picoam, "RANGE 2e-2") #set current range. -0.021-0.021 A
gpib.write(picoam, "RANGE:AUTO OFF") #change current range manually
gpib.write(picoam, "INIT") #read value of zero correction
gpib.write(picoam, "SYST:ZCOR:ACQ") #acquire value of zero correction
gpib.write(picoam, "SYST:ZCOR ON") #zero correction
gpib.write(picoam, "SYST:ZCOR OFF")
gpib.write(picoam, "SYST:ZCH OFF")
#turn on HV
gpib.write(picoam,
"SOUR:VOLT:RANG 500") #set voltage range. (only 10, 50, 500 V)
gpib.write(
picoam,
"SOUR:VOLT:ILIM 25") #set current limit. (only 25, 250, 2.5e-3, 25e-3 A)
def __init__(self,
sad=0,
timeout=13,
send_eoi=1,
eos_mode=0,
debug=False,
reset=False,
interfaces=[]):
if os.geteuid() != 0:
Logging.error(
"You need to have root privileges to run this script.")
self.started = False
exit(1)
self.debug = debug
self.reset = reset
self.devices = {}
self.started = True
self.drivers = {}
# We go through each driver and look at the attribute DEVICES which contains all devices the driver should be loaded for.
for i in dir(Drivers.GPIB):
if i[0] != "_" and i != "GenericDriver":
driver = getattr(Drivers.GPIB, i)
if hasattr(driver, "DEVICES"):
self.drivers.update(driver.DEVICES)
if self.debug:
Logging.info("Drivers for following devices have been loaded: %s" %
self.drivers)
self.reset_usb_controller()
# Interface ids are used to determine which usb connections need to be reset
# Example:
"""
Bus 001 Device 006: ID 3923:709b National Instruments Corp. GPIB-USB-HS
"""
self.interfaces = ["3923:709b", "0957:0518"] + interfaces
self.reset_interfaces()
progress_bar = ProgressBar(30)
discovered = {}
for pad in range(0, 31):
id = gpib.dev(0, pad, sad, timeout, send_eoi, eos_mode)
try:
driver_avaliable = False
gpib.clear(id)
gpib.write(id, "*IDN?")
device_id = gpib.read(id, 1024).rstrip()
for i in self.drivers:
if i in device_id:
self.devices[pad] = self.drivers[i](GPIBCommunicator(
id, self.reset_interfaces), device_id)
driver_avaliable = True
if not driver_avaliable:
self.devices[
pad] = Drivers.GPIB.GenericDriver.GenericDriver(
GPIBCommunicator(id, self.reset_interfaces),
device_id)
discovered[id] = device_id
except gpib.GpibError:
pass
progress_bar.update(pad)
for i in discovered:
Logging.header("%s on %s" % (discovered[i], i - 16))
Logging.success("Discovery finished successfully!")
def freq(self, freq=None):
if freq != None:
gpib.write(self.smiq, ':FREQ '+str(freq))
gpib.write(self.smiq, '*WAI')
gpib.write(self.smiq, ':FREQ?')
return float(gpib.read(self.smiq, 256))
def meas():
gpib.write(dc1, 'MEAS:CURR?')
s = gpib.read(dc1, 1000)
global t0
if t0 is None:
t0 = datetime.datetime.now()
t = datetime.timedelta(0)
else:
t = datetime.datetime.now() - t0
print('{}.{:06d},{}'.format(t.seconds, t.microseconds,
s.decode().rstrip()))
sys.stdout.flush()
gpib.write(dc1, '*IDN?')
s = gpib.read(dc1, 1000)
print('#', s.decode().rstrip())
gpib.write(dc1, 'SENS:CURR:DET DC')
gpib.write(dc1, 'SENS:CURR:DET?')
s = gpib.read(dc1, 1000)
print('#', s.decode().rstrip())
gpib.write(dc1, 'VOLT 5.0')
gpib.write(dc1, 'VOLT?')
s = gpib.read(dc1, 1000)
print('#', s.decode().rstrip(), 'V')
gpib.write(dc1, 'CURR 2.0')
gpib.write(dc1, 'CURR?')
def set_inst(self, handle, command, numbytes=100):
gpib.write(handle, command)
time.sleep(0.1)
return
def cw(self, freq=None, power=None):
gpib.write(self.smiq, ':FREQ:MODE CW')
if freq != None:
gpib.write(self.smiq, ':FREQ '+str(freq))
if power != None:
gpib.write(self.smiq, ':POW '+str(power))
def listrun(self):
gpib.write(self.smiq, ':TRIG:LIST') # startet
def _write(self, cmd):
if self._gpib_used:
gpib.write(self._dev, cmd)
else:
self._dev.write(cmd.encode())
def setpower(self, power=None):
if power != None:
gpib.write(self.smiq, ':POW '+str(power))
def initialise_device(handle): # set up device to assert SRQ/RQS
gpib.write(handle,"*CLS") # Clear status registers
gpib.write(handle,"*SRE 32") # Assert SRQ on OPC
return
def show_devid(handle): # Show device ID
print query(handle,"*IDN?")
return
print gpib.version() # Show package version
ud = gpib.dev(board,device) # Open the device
gpib.config(board,gpib.IbcTMO, gpib.T30s) # Set timeout to 30 seconds
show_devid(ud);
initialise_device(ud);
gpib.write(handle,"*TST;*OPC") # Initiate selftest and request OPC
# Wait for Timeout or Service Request on board
sta = gpib.wait(board, gpib.TIMO | gpib.SRQI)
if (sta & gpib.TIMO) != 0:
print "Timed out"
else:
print "SRQ asserted "
# For each device which might pull SRQ
stb = gpib.serial_poll(ud) # Read status byte
print "stb = %#x"%(stb)
if (stb & gpib.IbStbRQS) != 0: # Check for RQS bit
print "Device asserted RQS"
if (stb & gpib.IbStbESB) != 0: # Check for Event Status bit
esr = int(query(ud,"ESR?")) # Read Event Status Register
if (esr & 1) != 0: # Check for operation completed
print "Device Operation Completed"
def output_off(dev):
gpib.write(dev, 'OUTP OFF')
def write(self, command):
"""Write a command to the GPIB bus."""
gpib.write(self.scope, command)
def power(self, power=None):
if power != None:
print(power)
gpib.write(self.smiq, ':POW '+str(power))
gpib.write(self.smiq, ':POW?')
return float(gpib.read(self.smiq, 256))
gpib.write(handle, "*SRE 32") # Assert SRQ on Event
return
def show_devid(handle): # Show device ID
print query(handle, "*IDN?")
return
print gpib.version() # Show package version
ud = gpib.dev(board, device) # Open the device
gpib.config(board, gpib.IbcAUTOPOLL, 1) # Enable automatic serial polling
gpib.config(ud, gpib.IbcTMO, gpib.T30s) # Set timeout to 30 seconds
show_devid(ud)
initialise_device(ud)
gpib.write(handle, "*TST;*OPC") # Selftest and request OPC event
# Wait for Timeout or Request Service on device
sta = gpib.wait(ud, gpib.TIMO | gpib.RQS)
if (sta & gpib.TIMO) != 0:
print "Timed out"
else:
print "Device asserted RQS"
stb = gpib.serial_poll(ud) # Read status byte
print "stb = %#x" % (stb)
if (stb & gpib.IbStbESB) != 0: # Check for Event Status bit
esr = int(query(ud, "ESR?")) # Read Event Status Register
if (esr & 1) != 0: # Check for operation completed
print "Device Operation Completed"
# done
gpib.close(ud)
def preset(self):
"""Preset the instrument"""
gpib.write(self.device, "IP")
return()
def query(handle, command, numbytes=100):
gpib.write(handle, command)
response = gpib.read(handle, numbytes)
response = response.rstrip("\r\n")
return response
def sweep(self):
"""Take a sweep"""
gpib.write(self.device, "TS")
return()
def mandar(self, mensaje):
bb = gpib.write(self.equipo, mensaje)
def on(self):
gpib.write(self.smiq, ':OUTP ON')
gpib.write(self.smiq, '*WAI')
def _write(self, message: str):
gpib.write(self._device_handler, message + '\r')
def output(self):
gpib.write(self.smiq, ':OUTP?')
return gpib.read(self.smiq, 256)
def write( self, buf ): gpib.write( self.__interface, buf )
def connect(self):
self.smiq = gpib.find('smiq06b')
gpib.write(self.smiq, '*RST')
print('smiq connected')
def disconnect(self):
gpib.write(self.smiq, '*RST')
gpib.close(self.smiq)
print('smiq disconnected')
def __del__(self):
print('smiq disconnected')
gpib.write(self.smiq, '*RST')
gpib.close(self.smiq)
#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""
Created on Sun Oct 28 20:57:10 2018
@author: jonathan
"""
import gpib
import numpy as np
# GPIB interface 0, address 15
con = gpib.dev(0,15)
status = gpib.write(con, "COMM_FORMAT OFF")
#status = gpib.write(con, "COMM_FORMAT OFF,WORD,BIN")
status = gpib.write(con, "COMM_HEADER OFF")
status = gpib.write(con, "*IDN?")
deviceID = gpib.read(con, 1000).decode()
print("found device: " + deviceID)
# get template
print("fetching template")
status = gpib.write(con, "TEMPLATE?")
template = ""
chunk_size = 1024
keepFetching = True
while keepFetching:
def setfreq(self, freq=None):
if freq != None:
gpib.write(self.smiq, ':FREQ '+str(freq))
def write(self,text):
if self.eot:
text += "\n"
gpib.write(self.id, text)
def write(self, cmd):
gpib.write(self.dev, '%s\n' % (cmd, ))