Wayne’s information is incorrect, and is transformed into “voodoo” or (excuse the expression) – Blackmagic !. All AJA (and other manufacturer) products do NOT have to be connected to the RS422 device before powering on.
This would be an impossible situation for any broadcast facility, that has their VTR’s and edit controllers on RS422 patch panels. You can certainly patch and unpatch RS422 devices into any AJA product, without worrying about the system starting with the VTR connected. If it works for you – hey, that’s great – but I can assure you that you can have ANY NLE – AVID, Blackmagic, AJA, even the old Digital Voodoo – powered on, and then connect the RS422 device, and you will get control of the VTR. Even on the old AVID systems, there is a “check decks” menu, to refresh the connection to the RS422 VTR. Again, the use of a RS422 patch panel or ABCD box would be useless if you have to have a positive connection to a RS422 VTR before enabling operation.
Bob zelin