I am working on breaking it out using a protocol analyzer, the people that know aren't telling because they all have commercial products, cables, etc. I just want to make the protocol available, so as I get things deciphered I will post them if they fit within the posting rules.
I've got a good start at figuring out the protocol. Rather than post the details here, I am going to post my findings to my website at the below address. There is another thread here with people looking for the protocol and I don't want to have to update multiple posts when I find out something new.
If you have any questions, please contact me via my website, or post a reply here. I am subscribed to this thread.
Additional keywords: Directed DMHD-1000 TI DRI350