Found my answer. Insert the pageCursor for the current set of data to return the next set of 1000 or partial set of 1000. If your current set of data returns a pageCursor of pageCursor=1752b1f6-c8c3-11e2-8dd0-4040463f606d then your http request for the next set of data will look like....
https://my.idigi.com/ws/DataPoint/dia/channel/00000000-00000000-00000000-00000000/room1/temperature.xls?pageCursor=1752b1f6-c8c3-11e2-8dd0-4040463f606d