I have used the Describe method. This method is a way to get into the Powerbuilder run time attributes and methods. Here is the code I used to get all the data from a pbdatawindow.

Set dataWindowTO = ... pbdatawindow(''myDataWindow'')
Data = dataWindowTO.Describe(''datawindow.data'')
Reporter.ReportEvent micPass, ''DataWindow data'', Data

Recommend reading the ''HP QuickTest Object Model Reference'' for more information on this method
For reference data check out:

[Sybase DataWindow® Programmer's Guide][1]

[Sybase DataWindow Reference][2]

[1]: http://download.sybase.com/pdfdocs/pbg0900e/dwprgug.pdf
[2]: http://download.sybase.com/pdfdocs/pjg0400e/dwref.pdf

It has been found much easier to use the following line of code to get the text-based data from a datatable by using the following line of code where objTable is the table in question:

Data = objTable.Describe(''datawindow.data'')

I had help from Orasi Support to getting this answer. Good Luck!

But this is not returning the complete data in the datatable. Anyone else faced the same issue and knows the resolution?