Beispiel #1
0
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)
Beispiel #2
0
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)
Beispiel #3
0
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)