If you simply write data to an indicator, you are writing to the pc's memory. You could allocate an array at the beginning of your acquisition and then with each read, do a Replace Array Element.
I'm wondering though whether the instrument is capable of doing this. Since the internal buffer is too small, you might have to do an acquisition to it's max buffer size, do the transfer, and then initiate another acquisition. The instrument may not be able to start another acquisition until the transfer is complete and you would have a gap in your data. If you did single point acquisition where you did a number of write/reads, the bus communication is likely to take much longer than the .1 msec you want. I don't have the instrument or manual so you might want to contact Agilent to see whether what you want to do is even technically feasible. If it's not, one easy solution would be an NI data acquisition board. People do this sort of thing all of the time with them.
