Post by solipsistnation on Feb 16, 2021 16:02:44 GMT
I believe what you need is a PSU connected to the POWER or MASTER module in each 4x20 and then a single wire running between the ground connections on the POWER or MASTER modules. That will let you patch between racks without issue. If you want to link the busses, I think you'd need a MASTER in one rack and POWER in the bottom (MASTER provides the BUS signals, POWER doesn't, so they wouldn't fight with each other)-- then you can play with cutting wires on the 10-pin cable that runs between the racks (I believe you can cut the top 4-- the red one and the next 3, but you need to be very careful with this since if you plug them in wrong it's likely to cause problems).
OR-- and I think this is the better solution-- get a RACKLINK module set and just disable the +5 lines.
(It says they're not needed for newer racks, and they aren't, I think, if you're running a smaller rig than 2x4x20. They look good for isolating 2 separate power supplies while letting the other signals through.)
(Somebody should probably verify that this works the way I think it will, but it looks right to me.)