public void unassign_serial_numbers_to_top_starboard_downrigger(String configurationCode)
    {   
        //
        switch (configurationCode) 
        {
            //
            case "pfsmpa":
            {
                //
                Communication.starboard_middle_serial_number=null;
                //
                UserInterface.top_starboard_count_textfield.setText("");
                //
                break;
            }
            //
            case "pmsfsa":
            {
                //
                Communication.starboard_forward_serial_number=null;
                //
                UserInterface.top_starboard_count_textfield.setText("");
                //
                break;
            }
            //
            case "pfsfsapa":
            {
                //
                Communication.starboard_forward_serial_number=null;
                //
                UserInterface.top_starboard_count_textfield.setText("");
                //
                break;
            }
            //
            case "pfsfsmpm":
            {
                //
                Communication.starboard_forward_serial_number=null;
                //
                UserInterface.top_starboard_count_textfield.setText("");
                //
                break;
            }
            //
            case "pmsmsapa":
            {
                //
                Communication.starboard_middle_serial_number=null;
                //
                UserInterface.top_starboard_count_textfield.setText("");
                //
                break;
            }
            //
            default:
            {
                //
                break;
            }
        }        
    }