We've released the hardware manual for the XD series of players. You can find it on the Documentation page, which is located on the Support Menu to the left.
Our hardware manuals provide information about the voltages, circuits, ports, and pin-outs of different BrightSign models. This information is helpful for users who want to create or troubleshoot advanced multimedia setups. For most standard uses of BrightSign players, you’ll never need to look at the hardware manual.