I have made simple Visual Basic for Applications (VBA) apps, from within Excel by using the VBA comm control to get data from the serial port.
I do know that there also ready-made programs out there that will take data from a Serial port and shove them into a spreadsheet - you should be able to find them fairly easily by Googling +Excel +RS232 OR Serial.
Mike
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"Reason is not automatic. Those who deny it cannot be conquered by it. Do not count on them. Leave them alone." - Ayn Rand
I, too, have done some simple RS232 communications with VBA for Excel, reading data directly into a spreadsheet- only the VBA version that came with my older Ëxcel did not have the MSCOMM function- so I replaced it with the opensource XMCOMM, which is pretty much a straight clone of the MS version. Not being familiar with your controller, though, I can not help you with setting up the communications parameters and protocol...