I have my Mach 2 connected directly to its power supply and also connected via ethernet to a laptop pc for control. 

 

Then on top of the telescope is a Pegasus Powerbox that connects USB ports and power to the different devices (camera, focuser, FW, dew heaters), this is connected through the internal wiring of the Mach 2 to its own power supply and to the aforementioned laptop pc for control of the usb devices.