hi
i use similar deck – dsr-1500 ap
first – you connect computer and deck using serial cable to RS-422 port
2. link computer with deck by firewire cable
system must found deck (in periperials and printers)
3. in avid add deck (i dont remember menu)
4. change start/stop and etc command using by com3, com4 – not firewire
or
another (i think) link is
link only firewire cable
(system must found deck)
go to avid, add deck and using firewire port to commands
or other
link using SDI (i now use MOTU device)
and command start stop set by serial cable
all above tricks works