I am receiving the data through the rs232 in labview and i have to store the data in to the word file only if there is a change in the data and we have to scan the data continuasly how can i do that.

i am receiving the data through the rs232 in labview and i have to store the data in to the word or text file only if there is a change in the data. I have to scan the data continuasly. how can i do that. I was able to store the data into the text or word file but could not be able to do it.  I am gettting the data from rs232 interms of 0 or 1.  and i have to print it only if thereis a change in data from 0 to 1. if i use if-loop , each as much time there is 0 or 1 is there that much time the data gets printed. i dont know how to do this program please help me if anybody knows the answer

I have attatched the vi.  Here in this it receives the data from rs232 as string and converted into binery. and indicated in led also normally if the data 1 comes then the led's will be off.  suppose if 0 comes the corresponding data status is wrtten into the text file.  But here the problem is the same data will be printed many number of times.  so i have to make it like if there is a transition from 1 to o then only print it once.  how to do it.  I am doing this from few weeks please reply if you know the answer immediatly
thanking you 
Attachments:
MOTORTESTJIG.vi ‏729 KB

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