[Dx4win] M2 OR2800P-DC I/F Version 6.04

[n4zh at juno.com]

I went back in the archives a year and saw some related questions but they did not address my specific problem so I feel confident that I am not taking up bandwidth with an old question.
I want get the I/F between DX4WIN Version 6.04 running on XP and the M2 OR2800P-DC working.  I can talk to the rotator control unit using Hyperterm.  
The "Station" Screen under "Properties" shows the  format as Thunderform ARSWIN. There is no description of this in the manual anywhere.  I assume somebody knows what it is?
Any help would be greatly appreciated.
 
v/r     terry   N4ZH