How to power-up PSU from Proliant DL185 without mobo?

I have an old Proliant DL185 G5 server with a 447325-001 Power supply backplane. Two connectors seem to be interesting, one is what looks like an ATX-power connector and connecting green to GND spins up the fans of the attached 449840-002. The second is marked RPS, is a small connector and has 12 pins.

The issue is, no power is output on any pins. Looking at the service manual for DL185 it seems to be that the RPS connector attaches to 'MT9 Redundant Power Supply Management Interface Connector'

I have searched for any description of a RPS pinout without success. Do I need to use this connector to get power from the PSU? How can I get power from the PSU without a motherboard?

Solution 1:

Connect PIN 15 & PIN 16 (PWN_ON/Green to GND/Black) of the ATX (like?) header (image)

   .___.              
 1-|O O|--13           
 2-|O O|--14           
 3-|O O|--15           
 4-|O O|--16           
 5-|O O|--17           
 6-|O O|]-18           
 7-|O O|]-19           
 8-|O O|--20           
 9-|O O|--21           
10-|O O|--22
11-|O O|--23
12-|O O|--24
   '---'

And Connect PIN 7 (Black/White) & PIN 3 (Green/White) of the RPS/MT9 Redundant Power Supply Management Interface Connector (image)

   .___.              
 1-|O O|---7           
 2-|O O|---8           
 3-|O O|]--9           
 4-|O O|]-10           
 5-|O O|--11           
 6-|O O|--12           
   '---'

The attached pictures use a 26-Ohm resistor to connect the pins as that was what I had at hand, I assume it works with a paperclip too.

Image of AC-063-A PSU backplane

Solution 2:

I’d like to leave something more for the future.

I had same problem with very similar backplane: AC-063-2 A

This one have addidional pins on RPS connector. I figured it out: