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So...2 boxes (rsw04 & 05) have Titan power panels, Titan front panels, and Viper CPUs.  With testing, I found that the DC-DC control was not being driven by any of vio 0–7 (though vio 3 controlled the Aux power).  With the DC-DC control not driven (and thus at 0V), the DC-DC converter wasn't enabled to provide +24V to the Ubiquiti.  Thus, I came up with a hack of using wire-wrap wire to insert +5V to the "Titan J3" connection on the power front panel.  This successfully turns on the DC-DC converter.  However, since J3 is now not connected, we've lost vio control of Aux.  Thus, I also changed the Aux FET jumpers to leave Aux always on at +12V.  (This probably wasn't necessary, since the Aux FET control has a pull-up and was on anyway, but it seemed the proper thing to do.)

I haven't mapped out the other vio ports to determine which/how ttySx are controlled by vio, but it seems to differ from what vio reports.

Even though rsw02 has an actual Titan, I did the same wiring on that box as well.  Perhaps vio would have worked...

 

 

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