TDi <-> RS232 interface

Hey all, not 100% sure what this is used for, but its free if anyone wants it:

More pics here: http://imgur.com/a/d450c
I couldn't find out much info on what TDi is, or why it uses an XLR connector; I think it might be used as some kind of midi-over-serial for lighting control, but thats not confirmed. If anyone knows more about this box, please do post your knowledge.
Pickup is in Broadmeadows, Wellington.

More pics here: http://imgur.com/a/d450c
I couldn't find out much info on what TDi is, or why it uses an XLR connector; I think it might be used as some kind of midi-over-serial for lighting control, but thats not confirmed. If anyone knows more about this box, please do post your knowledge.
Pickup is in Broadmeadows, Wellington.