Serial port tri-state kudos and Comm or UAT

[vlittle]

I see Dynon has announced that multiple EFIS systems can or-tie their serial outputs to drive other instruments. This allows for graceful failure scenarios without an external switch.

This is a great innovation because it simplifies wiring and dramatically improves fault tolerance of multiple efis systems. This feature combined with their new Transponder and (hopefully) VHF Comm and ADS-B UAT means that a two-efis system can eliminate the traditional Transponder, Comm (GPS, UAT...) radio stack and still provide the redundancy and automatic cutover required to drive these instruments.

So when will Dynon introduce a Comm and UAT (and get all of my money?).

Vern

 

[pbennett]

DS, are all devices transmitting on the network bus tristated to prevent a failed device from disabling the bus?

Peter

 

[dynonsupport]

Vern - Good summary. That's exactly the reason we implemented this feature.

Peter - A single serial device still only talks to one serial port at a time, so a failed serial device won't affect other devices on other ports. Academically, the serial ports do use tristateing in this implementation, though. DSAB is a multidrop bus, but has its own failure coping mechanisms. Basically, both devices that go quiet and devices that go berserk are capable of being handled by SkyView. The latter capability is waiting on SkyView's ability to switch to a redundant set to data wires that are pre-wired in every SkyView system already. That capability will be added in 3.0.

 

[pbennett]

Nice feature. Some serious engineering behind that.
I take it that's the meaning of the DATA 1A, 1B and 2A, 2B in the bus wiring?

Peter

 

[dynonsupport]

Yes.