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why don't the Labview drivers for the serial interface with the HP34970A operate?

The drivers for the HP34970A Demos are set up for GPIB but contain the provisions for serial operation. The serial operation does not appear to operate. Any suggestions?
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I have had trouble with the VISA drivers when using a serial port. The problem I encountered was the string sent by each function did not have a terminator (\n) built into it. Appearently this terminator is optional on GPIB, but needs to be there on Serial. I have modified some of the VI's and added the terminator character and they then worked fine. I did not re-try them with GPIB to see if it affected them however.
I hope this helps.
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