Powering an Arduino Uno board with a -48v DC power plant

Using Arduino Motors, Mechanics, Power and CNC
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Here's another one, definitely isolated, with 5V output: http://uk.farnell.com/xp-power/jca0248s05/converter-dc-dc-1o-p-2w-5v/dp/1289170. The 12V version is http://uk.farnell.com/xp-power/jca0248s12/converter-dc-dc-1o-p-2w-12v/dp/1289171.