LED driver/Arduino?

[daplatapus]

I'm totally brain farting here. I built my controller based on the Jarduino sketch. All my strings are running on LDD boards but 1 of my LED strings are hooked onto a HLG-185H-42B and one to a HLG-185H-36B. Those are the ones I'm screwed up on.
The LED's are in series hooked onto the V- and V+
For the life of me I'm second guessing where the Dim+ and Dim- wires go. I thought the Dim+ went to my PWM control pin on the Arduino but nothing comes to mind for the Dim-. Does it get hooked to the ground plane of the Arduino board?

ARGH! I think I'm losing my mind...

 

[mcgyvr]

dim- is gnd on arduino/power supplies..

Note the negative leads from each power supply and ground on the arduino must all be tied to the same point so they are at the same potential..