class DictPropertyTester(object):
def __init__(self):
self.test = {1: 'a'}
self._test = {2: 'b'}
self.__test = {3: 'c'}
l1 = dict_property(lambda s: s.test, 1)
l2 = dict_property(lambda s: s._test, 2)
l3 = dict_property(lambda s: s.__test, 3)
s1 = dict_property('test', 1)
s2 = dict_property('_test', 2)
g1 = dict_property(_test_master, 4)
class ModbusCountersHandler(object):
'''
This is a helper class to simplify the properties for the counters::
0x0B 1 Return Bus Message Count
Quantity of messages that the remote
device has detected on the communications system since its
last restart, clear counters operation, or power-up. Messages
with bad CRC are not taken into account.
0x0C 2 Return Bus Communication Error Count
Quantity of CRC errors encountered by the remote device since its
last restart, clear counters operation, or power-up. In case of
an error detected on the character level, (overrun, parity error),
or in case of a message length < 3 bytes, the receiving device is
not able to calculate the CRC. In such cases, this counter is
also incremented.
0x0D 3 Return Slave Exception Error Count
Quantity of MODBUS exception error detected by the remote device
since its last restart, clear counters operation, or power-up. It
comprises also the error detected in broadcast messages even if an
exception message is not returned in this case.
Exception errors are described and listed in "MODBUS Application
Protocol Specification" document.
0xOE 4 Return Slave Message Count
Quantity of messages addressed to the remote device, including
broadcast messages, that the remote device has processed since its
last restart, clear counters operation, or power-up.
0x0F 5 Return Slave No Response Count
Quantity of messages received by the remote device for which it
returned no response (neither a normal response nor an exception
response), since its last restart, clear counters operation, or
power-up. Then, this counter counts the number of broadcast
messages it has received.
0x10 6 Return Slave NAK Count
Quantity of messages addressed to the remote device for which it
returned a Negative Acknowledge (NAK) exception response, since
its last restart, clear counters operation, or power-up. Exception
responses are described and listed in "MODBUS Application Protocol
Specification" document.
0x11 7 Return Slave Busy Count
Quantity of messages addressed to the remote device for which it
returned a Slave Device Busy exception response, since its last
restart, clear counters operation, or power-up. Exception
responses are described and listed in "MODBUS Application
Protocol Specification" document.
0x12 8 Return Bus Character Overrun Count
Quantity of messages addressed to the remote device that it could
not handle due to a character overrun condition, since its last
restart, clear counters operation, or power-up. A character
overrun is caused by data characters arriving at the port faster
than they can.
.. note:: I threw the event counter in here for convinience
'''
__data = dict([(i, 0x0000) for i in range(9)])
__names = [
'BusMessage', 'BusCommunicationError', 'SlaveExceptionError',
'SlaveMessage', 'SlaveNoResponse', 'SlaveNAK', 'SlaveBusy',
'BusCharacterOverrun'
'Event '
]
def __iter__(self):
''' Iterater over the device counters
:returns: An iterator of the device counters
'''
return izip(self.__names, self.__data.itervalues())
def update(self, values):
''' Update the values of this identity
using another identify as the value
:param values: The value to copy values from
'''
for k, v in values.iteritems():
v += self.__getattribute__(k)
self.__setattr__(k, v)
def reset(self):
''' This clears all of the system counters
'''
self.__data = dict([(i, 0x0000) for i in range(9)])
def summary(self):
''' Returns a summary of the counters current status
:returns: A byte with each bit representing each counter
'''
count, result = 0x01, 0x00
for i in self.__data.values():
if i != 0x00: result |= count
count <<= 1
return result
#-------------------------------------------------------------------------#
# Properties
#-------------------------------------------------------------------------#
BusMessage = dict_property(lambda s: s.__data, 0)
BusCommunicationError = dict_property(lambda s: s.__data, 1)
BusExceptionError = dict_property(lambda s: s.__data, 2)
SlaveMessage = dict_property(lambda s: s.__data, 3)
SlaveNoResponse = dict_property(lambda s: s.__data, 4)
SlaveNAK = dict_property(lambda s: s.__data, 5)
SlaveBusy = dict_property(lambda s: s.__data, 6)
BusCharacterOverrun = dict_property(lambda s: s.__data, 7)
Event = dict_property(lambda s: s.__data, 8)
class ModbusDeviceIdentification(object):
'''
This is used to supply the device identification
for the readDeviceIdentification function
For more information read section 6.21 of the modbus
application protocol.
'''
__data = {
0x00: '', # VendorName
0x01: '', # ProductCode
0x02: '', # MajorMinorRevision
0x03: '', # VendorUrl
0x04: '', # ProductName
0x05: '', # ModelName
0x06: '', # UserApplicationName
0x07: '', # reserved
0x08: '', # reserved
# 0x80 -> 0xFF are private
}
__names = [
'VendorName',
'ProductCode',
'MajorMinorRevision',
'VendorUrl',
'ProductName',
'ModelName',
'UserApplicationName',
]
def __init__(self, info=None):
'''
Initialize the datastore with the elements you need.
(note acceptable range is [0x00-0x06,0x80-0xFF] inclusive)
:param info: A dictionary of {int:string} of values
'''
if isinstance(info, dict):
for key in info.keys():
if (0x06 >= key >= 0x00) or (0x80 > key > 0x08):
self.__data[key] = info[key]
def __iter__(self):
''' Iterater over the device information
:returns: An iterator of the device information
'''
return self.__data.iteritems()
def summary(self):
''' Return a summary of the main items
:returns: An dictionary of the main items
'''
return dict(zip(self.__names, self.__data.itervalues()))
def update(self, value):
''' Update the values of this identity
using another identify as the value
:param value: The value to copy values from
'''
self.__data.update(value)
def __setitem__(self, key, value):
''' Wrapper used to access the device information
:param key: The register to set
:param value: The new value for referenced register
'''
if key not in [0x07, 0x08]:
self.__data[key] = value
def __getitem__(self, key):
''' Wrapper used to access the device information
:param key: The register to read
'''
return self.__data.setdefault(key, '')
def __str__(self):
''' Build a representation of the device
:returns: A string representation of the device
'''
return "DeviceIdentity"
#-------------------------------------------------------------------------#
# Properties
#-------------------------------------------------------------------------#
VendorName = dict_property(lambda s: s.__data, 0)
ProductCode = dict_property(lambda s: s.__data, 1)
MajorMinorRevision = dict_property(lambda s: s.__data, 2)
VendorUrl = dict_property(lambda s: s.__data, 3)
ProductName = dict_property(lambda s: s.__data, 4)
ModelName = dict_property(lambda s: s.__data, 5)
UserApplicationName = dict_property(lambda s: s.__data, 6)