Open file in main vi, write in subvi and close in mainvi

Hi,
Im opening a file in the main vi , passing the reference number to the
write to text file which is located in the subvi and passing the refnum
out from this vi to the main vi again to close the file.
But, I always have only the last value of the measurement stored.
Im getting data from the serial port.
what am I doing wrong?
Can someone help me.
Thanks and regards.

You probably have forgotten to set the "Write" function to APPEND the data to the file.
This has nothing to do with where you are writing the file.  Check the inputs for the write function and make sure you set it up to append.
Shane.
Using LV 6.1 and 8.2.1 on W2k (SP4) and WXP (SP2)

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