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Instrument I/O Assistant

I'm having some trouble with the Instrument I/O assistant.
I have an instrument hooked up to the serial port via RS232 null-modem cable.

I can read in information, and then parse the individual tokens.......once.
 
If I try to put this I/O assitant in a loop, or run it more than once, I get an error:
 
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Error 1 occurred at Scan From String (arg 1) in Instance           8 12Gas Analyzer .vi->Gas Analyzer.vi
 
Possible reason(s):
LabVIEW:  An input parameter is invalid. For example if the input is a path, the path might contain a character not allowed by the OS such as ? or @.
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NI-488:  Command requires GPIB Controller to be Controller in Charge.
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Any thoughts?
- Cory
Cory K
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Will there be data to be read?
 
Can you post your code?  that would be easier...
 
R
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