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Having problems with serial read

I am trying to write a serial application to run on a PDA. Sometimes the program works and sometimes it does not.  When it does not, i get a block with a part of a response from the instrument.
I have posted screenshots. I am not sure as how to go about fixing this.
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One non-deterministic behavior I see with the code is that the 200msec Wait within the sequence structure may execute before or after your serial write.
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