??? ALARM??? -no connection between rs232 and PC when using serialread.vi

i send you my code and whats happening when there is no connection with my RS232.the program execution doesnt stop but there is no data flow from the RS232.how to detect that there is no connection.
Attachments:
Pita.vi ‏87 KB
Pitai.ace ‏23 KB

There is not much execution control in the code; the initialization might be done prior or after the write, and you do a read without knowing how many bytes there really is at the port. Use dat flow to ensure that things execute in the correct order, and use the bytes at port to check whether the 7 byte reply has been received, do not read and decode before bytes at port reports that there is 7 bytes available...
MTO

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