While lightpipe can be used for S/PDIF transfers, the only other use for it is for the proprietary ADAT format. Alesis and Tascam's TDIF formats do not interchange.
You will not be able to use the ADAT edit with anything other than something that has ADAT lightpipe. I have never heard of the DA-88 offering that. Sorry.
aight, thanks guys! i have a client that is recording a live concert on 4 DA88's, what would be the best way to transfer these into my computer for editing?