public void assign_serial_numbers_to_bottom_port_downrigger()
    {
        //
        String serial_number = "$"+(String)bottom_port_device_combobox.getSelectedItem();
        //
        switch (Geometry.configurationCode) 
        {
            //
            case "pfsmpa":
            {
                //
                Communication.port_aft_serial_number=serial_number;
                //
                break;
            }
            //
            case "pfsfsapa":
            {
                //
                Communication.port_aft_serial_number=serial_number;
                //
                break; 
            }
            //
            case "pfsfsmpm":
            {
                //
                Communication.port_middle_serial_number=serial_number;
                //
                break;
            }
            //
            case "pmsmsapa":
            {
                //
                Communication.port_aft_serial_number=serial_number;
                //  
                break;
            }
            //
            default:
            {
                //
                break;
            }                
        }
    }