creating and using serial objects within a class

Hi, i've created a script where i am setting up a serialport object in one function and then sending commands to the serial object in another.

however the object is empty when i try to talk to it any ideas where i'm going wrong here?

the functions are being called from an app.

classdef XY_STAGE_TEST
    %UNTITLED Summary of this class goes here
    %   Detailed explanation goes here
    
    properties (Access = public)
        
        XY_port
        XY_Comm
        
        p;
        b;
        db;
        sb;
        par;
        fcon;
        Serial;
        State;
        S_port;
    end
    
    methods (Access = public)
        function app = XY_STAGE_TEST(port,braud, databits, sbit, parity, fcontrol)     
            app.p=strcat('COM',num2str(port));
            app.b=braud;
            app.db=databits;
            app.sb =sbit;
            app.par = parity;
            app.fcon = fcontrol;
        end
        
        function [app,State,msg] = XYSerialConnectPort(app) %setup port and check port is availible
            if ismember(app.p,serialportlist)
                 msg = strcat(app.p,' port found');            
                
                try
                    app.S_port = serialport(app.p,app.b,'DataBits',app.db,'StopBits',app.sb,'Parity',app.par,'FlowControl',app.fcon);
                    State = true;
                    msg = strcat(msg,' and Connected');
                    
                catch
                    State = false;
                    msg = strcat(msg,' but I cannot talk to XY comm port, is it already in in use?');
                    
                end
            else
                State = false;
                msg = strcat(app.p,' port can not be connected to are you sure it is or not already in use')
            end
            %disp (State)
        end
        
        function [app,State,msg] = connect(app)        
            [app,State,msg]= app.XYSerialConnectPort();
        end

        function [app] = home(app)
            %app.S_port=serialport(app.p,app.b,'DataBits',app.db,'StopBits',app.sb,'Parity',app.par,'FlowControl',app.fcon)  % if i create the serial object here it works fine
            %Home Y '430401002201'
            str= '430401002201';
            command=sscanf(str,'%2X')
            write(app.S_port,command,'int8');
        end

        function close(app)
            delete(app.XY_Comm) 
            delete(app.S_port) 
            disp 'closed'
        end
        
    end
end

[Jyotsna Talluri]

What are your inputs?

[Walter Roberson]

Is it thinking that it is able to connect to it when you use XYSerialConnectPort ?