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To configure an XBee module, we need to be able to talk to it. Generally, we’ll be using your Mac to configure your XBee, although there is nothing stopping us from writing an iPhone or iPad application to allow us to do this configuration. For now, we’ll need a way to connect the XBee to your Mac’s USB port.
Since they were designed to be soldered directly to a PCB, XBee modules rather unfortunately use 2 mm headers instead of the more familiar 0.1 in headers we are all so used to. They therefore generally require a breakout board of some kind before they can be used on a standard bread- or proto-board, and an adaptor before they can be connected to your Mac.