Relating to the aviation and obstacles database updates is the Ethernet cable connecting the second screen, or lack of. Each SVT has an Ethernet port and Dynon recommends that an ethernet cable be installed between the displays. This is in addition to the SV network connections. Van's does not include an Ethernet cable in the dual display kit and the instructions are mute regarding it.
According the the Dynon Installation manual the purpose of the Ethernet cable is to allow the updates to transfer to the other screen if they are loaded on any display. Without the Ethernet connection the aviation and obstacles databases will need to be loaded on each display individually.
This is only for the aviation and obstacle updates, any software upgrades have to be loaded to displays individually. For software updates I use the releases from Dynon's web site rather than Van's. The Dynon files have not changed any of the Van's configurations or my configurations that exist on my displays. On the other hand I have in the past had the Van's files change some of my customized settings and reset some things to Van's RV-12 defaults. In any case, for software upgrades, it's always a good plan to do a "save configuration", just in case stuff happens.
Any Ethernet cable will technically work, according to Dynon, but they spec out one of theirs for aircraft use. Dynon part P/N SV-ETHERNET-3CC.
The cable can be installed by easing each display out of the panel, make one connection and snake the cable around to the second display and make its connection.
The updates go quickly even if you have to load them into each display individually but I find having the Ethernet connection makes aviation and obstacle updates even more convenient.