def __init__(self, rx_cobid, tx_cobid, node):
        """
        :param int rx_cobid:
            COB-ID that the server receives on (usually 0x600 + node ID)
        :param int tx_cobid:
            COB-ID that the server responds with (usually 0x580 + node ID)
        :param canopen.LocalNode od:
            Node object owning the server
        """
        SdoBase.__init__(self, rx_cobid, tx_cobid, node.object_dictionary)
        self._node = node
        self._buffer = None
        self._toggle = 0
        self._index = None
        self._subindex = None
        self.last_received_error = 0x00000000