The DDE server stores the most recent value only. You may add some VBA code within the Excel sheet and handle DDE data yourself (please, look at this:
http://www.aggsoft.com/asdl-excel-read-via-dde.htm). If you want to rotate the data within Excel then you may try the "Move" filling mode of the Direct Excel Connection plug-in. But this method will work slightly different, as you described in your previous post.