Receive serial data in Hex

I wanted to write data received from serial port in text file. I want received data in the form

 40 00 20 00 10 00 08 00 00 0A 0F 0D 10

but i am getting data in the test file as 40 0 20 0 10 0 8 0 0 A F D 10.

Please tell me what should i use to get data as i received.

I am using following code

Rcvd = fread(serConn,45000,'char');     
hexpass=sprintf(num2str('%3X', Rcvd)); 
 header1 = '';
 file_id=fopen('MyFile.txt','w');
 fprintf(file_id,[header1 '\n']);
 fprintf(file_id,'%s',hexpass);

Please suggest me to get the data in txt file as

 40 00 20 00 10 00 08 00 00 0A 0F 0D 10

Thanks in adavance

Answer 1

[Walter Roberson]

hexpass = num2str(Rcvd, '%02X ');
hexpass(end) = '';    %get rid of trailing space

[Prashant Funde]

Hello Mr. Walter thanks for your answer but if i use above mentioned functions/steps then data written in txt file is coming like

2C41A7F3CF23402010000000000040201

where as in a text box or display it is seen like

24
CC
43
A4
70

and like this. So if i am using following lines

 %  hexpass=sprintf(num2str('%03X', Rcvd));  %Convert Data reaceived at COM port to hex value
 hexpass = num2str(Rcvd,'%02X ');
 hexpass(end) = '';    %get rid of trailing space

 assignin('base','Hex',hexpass);       
 set(handles.Rx,'String',hexpass);      
 disp(hexpass);                          
 header1 = 'Data in Hex format';
 file_id=fopen('MyFile.txt','w');
 fprintf(file_id,[header1 '\n']);
 fprintf(file_id,'%s',hexpass);
 fclose(file_id);

[Walter Roberson]

 hexpass = num2str(Rcvd(:).', '%02X ');
 hexpass(end) = '';    %get rid of trailing space