ATX, WTX and other standard and proprietary power supply (PSU) cables connectors pinouts  > Dell pinouts
For Dell Optiplex SX280, GX620, 745, 745c, 755, 760 Series Ultra small form factor (USFF) PC. Dell Part Numbers: M8811, RXVT7, Y2515, D3860, 86FYX, MK394 Models ADP-220AB B, D220P-01, F180PU-00

The pinout below is from testing with a multi-meter. The power supply signal location is tested. Connecting the signal from PIN 8 to Ground will switch the Power  on. I can't figure out what PIN 4 is for, perhaps another signal? Pins start from the top right of the receptical and continue on the top row starting the bottom row at pin 5 on the right most side.

Pin
Number
Pin
Name
Description Pin Shape
1   +12v Rail 1 Circle
2   +12v Rail 2 Square
3   +12v Rail 3 Square
4   Reserved Circle
5   G Ground   Square
6   G Ground Circle
7   G Ground Circle
8   S Signal Square

The below table is a representation of what the female receptical would look like if you were to look at it straight on with the clip fastener on the bottom. Of course this would be flipped left to right for the cord itself (male end).

Pin 4 is reserved. System is expecting 12VDC 18A.

 Female Receptical

U +12 +12 +12
S G G G
Fastener

Dell power supply D220P-01: Except that the diagramme and chart pinout on the web page are backwards compared to the diagramme on the nameplate on the power supply. The operative info is the line "Connecting the signal from PIN 8 to Ground will switch the Power on." When you realise that his Pin 8 (Signal) is really Pin 5 (Remote) then you can jumper 5-6 and the pilot light turns from orange to green and 12v appears on pins 2,3,4. (As indicated on the nameplate.) 

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According to 4 reports in our database (3 positive and 0 negative) this pinout should be correct.

Is this pinout
Dell 180W DA-3/DA-2 OptiPlex Ultra Small Form Factor (USFF) Power Adapter visual pinout:
Dell 180W DA-3/DA-2 OptiPlex Ultra Small Form Factor (USFF) Power Adapter diagram
click to enlarge
Source(s) of this and additional information: None, http://i167.photobucket.com/albums/u126/eitheta/nsk1300/DellACDC.jpg
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