@classmethod<EOL><INDENT>def query_nds2(cls, names, host=None, port=None, connection=None,<EOL>type=io_nds2.Nds2ChannelType.any(), unique=False):<DEDENT>
ndschannels = io_nds2.find_channels(names, host=host, port=port,<EOL>connection=connection, type=type,<EOL>unique=unique)<EOL>return cls(map(Channel.from_nds2, ndschannels))<EOL>
Query an NDS server for channel information

        Parameters
        ----------
        name : `str`
            name of requested channel
        host : `str`, optional
            name of NDS2 server.
        port : `int`, optional
            port number for NDS2 connection
        connection : `nds2.connection`
            open connection to use for query
        type : `str`, `int`
            NDS2 channel type with which to restrict query
        unique : `bool`, optional
            require a unique query result for each name given, default `False`

        Returns
        -------
        channellist : `ChannelList`
            list of `Channels <Channel>` with metadata retrieved from
            NDS2 server

        Raises
        ------
        ValueError
            if multiple channels are found for a given name and `unique=True`
            is given

        Notes
        -----
        .. warning::

           A `host` is required if an open `connection` is not given