VBA Reading Data From Serial Bus : I am really struggling with this one...

I have an Arduino board that is has a script that reads one of the analog ports and dumps the value to the USB (in my case, it's COM4).

I want to be able to read this in VBA and dump it into Excel.  This is just the first step... a proof of concept, if you will...

I have installed a module called modCOMM (http://www.thescarms.com/vbasic/CommIO.aspx) and in that, there is a function called CommRead(intPortID, strData, ingSize)).

I am sure that I'm not seeing something simple here... 

Does anybody have any experience with this?  Any tips or pointers to a tutorial would be very helpful.

Thanks.

Greg