Can I use switches to power my ISereis device on and off?

On your Iseries device, go into the Control Center and select Switches.  There are options here to enable switch 1 and switch 2 to act as Power On and Power Off buttons.

Note: When choosing the act as Power Off button option, keep in mind that pressing the switch for 2-7 seconds will cause a normal power button press.  Pressing the switch for more than 7 seconds will immediately shut down which disregards any unsaved changes.