Help with ADT

["Greg Andrzejewski" <pressyourluck85@yahoo.com>]

Hello,
    I recently got a ROM 1 IIgs without any software. The DOS 3.3 and ADT
v1.21 dumps went fine with Hyperterminal and a Super Serial Card, but I
can't seem to get ADT to work. When I try to receive a disk image on the
IIgs using ATDwin, nothing happens once it says "Waiting for PC to reply."
The MS-DOS version performs similarly, execpt the PC says "00: Unknown
error" or somthing like that. Any ideas on what could be wrong? If not, are
there any other ways of getting Apple II disk images onto a floppy? Thanks.