def write_multiple_coils(slave_id, starting_address, values):
function = WriteMultipleCoils()<EOL>function.starting_address = starting_address<EOL>function.values = values<EOL>return _create_request_adu(slave_id, function.request_pdu)<EOL>
Return ADU for Modbus function code 15: Write Multiple Coils.

    :param slave_id: Number of slave.
    :return: Byte array with ADU.