def _read_spectrum_data(self):
usb_speed = self._usb_speed
# Only query the value if there is no cached value
if usb_speed is None:
usb_speed = self.usb_speed
n_packets, packet_length = (8, 512) if usb_speed == 'high' else (64,
64)
# Assign endpoint
vpp43.set_attribute(self._vi, VI_ATTR_USB_BULK_IN_PIPE, 0x82)
data = ''
for i in range(n_packets):
data += vpp43.read(self._vi, packet_length)
# Read sync packet to check if properly synchronized
sync_byte = vpp43.read(self._vi, 1)
if sync_byte != '\x69' or len(data) != 4096:
raise visa.VisaIOError(OO_ERROR_SYNC)
# Reassign endpoint
vpp43.set_attribute(self._vi, VI_ATTR_USB_BULK_IN_PIPE, 0x81)
spectrum = N.fromstring(data, N.dtype('<u2'))
# Query and cache the saturation level if it is not cached
if self._saturation_level is None:
vpp43.write(self._vi, '\x05\x11')
autonull_info = vpp43.read(self._vi, 17)
self._saturation_level = (
65536.0 / struct.unpack('<H', autonull_info[6:8])[0])
# Hmmm, it seems that this is an OceanOptics trick to sell
# spectrometers with much less dynamic range than advertised!
return spectrum * self._saturation_level
def _read_spectrum_data(self):
# Assign endpoint
vpp43.set_attribute(self._vi, VI_ATTR_USB_BULK_IN_PIPE, 0x82)
data = ''
for i in range(32):
lsbs = vpp43.read(self._vi, 64)
msbs = vpp43.read(self._vi, 64)
# Mask MSB high bits - instrument has 12-bit A/D
msbs = ''.join([chr(ord(byte) & 0x0F) for byte in msbs])
bs = bytearray(128)
bs[::2] = lsbs
bs[1::2] = msbs
data += str(bs)
# Read sync packet to check if properly synchronized
sync_byte = vpp43.read(self._vi, 1)
if sync_byte != '\x69' or len(data) != 4096:
raise visa.VisaIOError(OO_ERROR_SYNC)
# Reassign endpoint
vpp43.set_attribute(self._vi, VI_ATTR_USB_BULK_IN_PIPE, 0x87)
return N.fromstring(data, N.int16)
def _read_spectrum_data(self):
usb_speed = self._usb_speed
# Only query the value if there is no cached value
if usb_speed is None:
usb_speed = self.usb_speed
n_packets, packet_length = (8, 512) if usb_speed == 'high' else (64, 64)
# Assign endpoint
vpp43.set_attribute(self._vi, VI_ATTR_USB_BULK_IN_PIPE, 0x82)
data = ''
for i in range(n_packets):
data += vpp43.read(self._vi, packet_length)
# Read sync packet to check if properly synchronized
sync_byte = vpp43.read(self._vi, 1)
if sync_byte != '\x69' or len(data) != 4096:
raise visa.VisaIOError(OO_ERROR_SYNC)
# Reassign endpoint
vpp43.set_attribute(self._vi, VI_ATTR_USB_BULK_IN_PIPE, 0x81)
spectrum = N.fromstring(data, N.dtype('<u2'))
# Query and cache the saturation level if it is not cached
if self._saturation_level is None:
vpp43.write(self._vi, '\x05\x11')
autonull_info = vpp43.read(self._vi, 17)
self._saturation_level = (65536.0
/ struct.unpack('<H', autonull_info[6:8])[0])
# Hmmm, it seems that this is an OceanOptics trick to sell
# spectrometers with much less dynamic range than advertised!
return spectrum * self._saturation_level
def _read_spectrum_data(self):
# Assign endpoint
vpp43.set_attribute(self._vi, VI_ATTR_USB_BULK_IN_PIPE, 0x82)
data = ''
for i in range(32):
lsbs = vpp43.read(self._vi, 64)
msbs = vpp43.read(self._vi, 64)
# Mask MSB high bits - instrument has 12-bit A/D
msbs = ''.join([chr(ord(byte) & 0x0F) for byte in msbs])
bs = bytearray(128)
bs[::2] = lsbs
bs[1::2] = msbs
data += str(bs)
# Read sync packet to check if properly synchronized
sync_byte = vpp43.read(self._vi, 1)
if sync_byte != '\x69' or len(data) != 4096:
raise visa.VisaIOError(OO_ERROR_SYNC)
# Reassign endpoint
vpp43.set_attribute(self._vi, VI_ATTR_USB_BULK_IN_PIPE, 0x87)
return N.fromstring(data, N.int16)
def _open_serial_connection(self):
logging.debug(__name__ + ":Opening serial connection")
self._session = vpp43.open_default_resource_manager()
self._vi = vpp43.open(self._session, self._address)
vpp43.set_attribute(self._vi, vpp43.VI_ATTR_ASRL_BAUD, 115200)
vpp43.set_attribute(self._vi, vpp43.VI_ATTR_ASRL_DATA_BITS, 8)
vpp43.set_attribute(self._vi, vpp43.VI_ATTR_ASRL_STOP_BITS, vpp43.VI_ASRL_STOP_ONE)
vpp43.set_attribute(self._vi, vpp43.VI_ATTR_ASRL_PARITY, vpp43.VI_ASRL_PAR_ODD)
vpp43.set_attribute(self._vi, vpp43.VI_ATTR_ASRL_END_IN, vpp43.VI_ASRL_END_NONE)
def _open_serial_connection(self):
logging.debug(__name__ + ':Opening serial connection')
self._session = vpp43.open_default_resource_manager()
self._vi = vpp43.open(self._session, self._address)
vpp43.set_attribute(self._vi, vpp43.VI_ATTR_ASRL_BAUD, 115200)
vpp43.set_attribute(self._vi, vpp43.VI_ATTR_ASRL_DATA_BITS, 8)
vpp43.set_attribute(self._vi, vpp43.VI_ATTR_ASRL_STOP_BITS,
vpp43.VI_ASRL_STOP_ONE)
vpp43.set_attribute(self._vi, vpp43.VI_ATTR_ASRL_PARITY,
vpp43.VI_ASRL_PAR_ODD)
vpp43.set_attribute(self._vi, vpp43.VI_ATTR_ASRL_END_IN,
vpp43.VI_ASRL_END_NONE)
def initPSU():
IPaddr = "192.168.6.6"
defaultRm = vpp43.open_default_resource_manager()
if defaultRm < VI_SUCCESS:
print "status < VI_SUCCESS, quitting"
quit()
rsc = []
rsc.extend([] * 256)
rsc = "TCPIP::192.168.6.6::2268::SOCKET"
accessMode = VI_NO_LOCK
timeout = 0
vi = vpp43.open(defaultRm, rsc, accessMode, timeout)
vpp43.set_attribute(vi, VI_ATTR_TMO_VALUE, 10000)
vpp43.set_attribute(vi, VI_ATTR_TERMCHAR_EN, VI_TRUE)
setPSU(vi, 0, 0)
return vi
def _open_serial_connection(self):
'''
Opens the ASRL connection using vpp43
baud=9600, databits=8, stop=one, parity=none, no end char for reads
Input:
None
Output:
None
'''
logging.debug(__name__ + ' : Opening serial connection')
self._visa = visa.SerialInstrument(self._address,
baud_rate=9600, data_bits=8, stop_bits=1,
parity=visa.no_parity, term_chars="",
send_end=False, chunk_size=8)
vpp43.set_attribute(self._visa.vi, vpp43.VI_ATTR_ASRL_END_IN,
vpp43.VI_ASRL_END_NONE)
def _open_serial_connection(self):
'''
Opens the ASRL connection using vpp43
baud=115200, databits=8, stop=one, parity=odd, no end char for reads
Input:
None
Output:
None
'''
logging.debug(__name__ + ' : Opening serial connection')
self._session = vpp43.open_default_resource_manager()
self._vi = vpp43.open(self._session, self._address)
vpp43.set_attribute(self._vi, vpp43.VI_ATTR_ASRL_BAUD, 115200)
vpp43.set_attribute(self._vi, vpp43.VI_ATTR_ASRL_DATA_BITS, 8)
vpp43.set_attribute(self._vi, vpp43.VI_ATTR_ASRL_STOP_BITS,
vpp43.VI_ASRL_STOP_ONE)
vpp43.set_attribute(self._vi, vpp43.VI_ATTR_ASRL_PARITY,
vpp43.VI_ASRL_PAR_ODD)
vpp43.set_attribute(self._vi, vpp43.VI_ATTR_ASRL_END_IN,
vpp43.VI_ASRL_END_NONE)
def _open_serial_connection(self):
'''
Opens the ASRL connection using vpp43
baud=9600, databits=8, stop=one, parity=none, no end char for reads
Input:
None
Output:
None
'''
logging.debug(__name__ + ' : Opening serial connection')
self._visa = visa.SerialInstrument(self._address,
baud_rate=9600,
data_bits=8,
stop_bits=1,
parity=visa.no_parity,
term_chars="",
send_end=False,
chunk_size=8)
vpp43.set_attribute(self._visa.vi, vpp43.VI_ATTR_ASRL_END_IN,
vpp43.VI_ASRL_END_NONE)
def _open_serial_connection(self):
'''
Opens the ASRL connection using vpp43
baud=115200, databits=8, stop=one, parity=odd, no end char for reads
Input:
None
Output:
None
'''
logging.debug('Opening serial connection')
self._session = vpp43.open_default_resource_manager()
self._vi = vpp43.open(self._session, self._address)
vpp43.set_attribute(self._vi, vpp43.VI_ATTR_ASRL_BAUD, 115200)
vpp43.set_attribute(self._vi, vpp43.VI_ATTR_ASRL_DATA_BITS, 8)
vpp43.set_attribute(self._vi, vpp43.VI_ATTR_ASRL_STOP_BITS,
vpp43.VI_ASRL_STOP_ONE)
vpp43.set_attribute(self._vi, vpp43.VI_ATTR_ASRL_PARITY,
vpp43.VI_ASRL_PAR_ODD)
vpp43.set_attribute(self._vi, vpp43.VI_ATTR_ASRL_END_IN,
vpp43.VI_ASRL_END_NONE)
def open(self):
# Open instrument
self._vi = vpp43.open(visa.resource_manager.session,
self._resource_name)
vpp43.set_attribute(self._vi, vpp43.VI_ATTR_TMO_VALUE, self._timeout)
# Timeout value should always be higher than integration time
# Assign endpoint
vpp43.set_attribute(self._vi, VI_ATTR_USB_BULK_IN_PIPE, self._in_pipe)
vpp43.set_attribute(self._vi, VI_ATTR_USB_BULK_OUT_PIPE, self._out_pipe)
# Initialize
vpp43.write(self._vi, '\x01') # Reset command
def open(self):
# Open instrument
self._vi = vpp43.open(visa.resource_manager.session,
self._resource_name)
vpp43.set_attribute(self._vi, vpp43.VI_ATTR_TMO_VALUE, self._timeout)
# Timeout value should always be higher than integration time
# Assign endpoint
vpp43.set_attribute(self._vi, VI_ATTR_USB_BULK_IN_PIPE, self._in_pipe)
vpp43.set_attribute(self._vi, VI_ATTR_USB_BULK_OUT_PIPE,
self._out_pipe)
# Initialize
vpp43.write(self._vi, '\x01') # Reset command
