Test on the bench 12.08 volts power 5.05 volts out on the 5volt aux power pin More from the manual. Using the Auxiliary Power Connector, J17: J17 is a multi-purpose connector. Typically it is not needed, but it can be used for 2 optional features. If you choose to power the E682 from its own power supply, rather than from the pixel power source, you would connect that power supply to J17. +V to the top pin, and GROUND to the 2nd pin from the top. This power supply should provide from 7-24 volts DC, and be rated at a minimum of 500ma. This supply should be externally current-limited or fused at no more than 2 amps. If the E682 is powered in this manner, Power Select Jumpers must be installed between pins 1 and 2, and 4 and 5. The second use of J17 is to supply a +5VDC output. This would typically be used to power a small Ethernet switch located near the E682. Having a small Ethernet switch near the controller can simplify the network wiring since, when using multiple controllers, it eliminates the need to run an Ethernet cable from every controller back to a remote switch. The ability to power the Ethernet switch from the E682 simplifies wiring, since it eliminates the need for a separate switch power transformer, and the 120VAC wiring to it. You must of course choose an Ethernet switch that runs off of +5VDC, at a maximum of 1 amp. The +5V power output is the 3rd terminal from the top of J17, and ground is the bottom terminal. See the screened legend on the board. Note that J17 can be used for both functions simultaneously, but in that case be sure to use an external power supply rated at a minimum of 1.5 amps since it will be powering both the E682 and the connected Ethernet switch.