Here’s an alternative way of hooking up your xbee to your computer using your existing Max32 or any 3.3V arduino-compatible boards.

Xbee   to   Max32 
DOUT ------ 1(TX0)
DIN  ------ 0(RX0)
VCC  ------ 3.3V
GND  ------ GND
RST to GND ( This is to deactivate the max32 mcu)

Ref:

Arduino Uno to Xbee

Parallax XBee USB Adapter Board

http://www.parallax.com/product/32400

Using X-CTU on linux

http://lizard43.blogspot.com/2008/10/x-ctu-with-linux.html

Chipkit Max32 Schematics

http://www.digilentinc.com/Data/Products/CHIPKIT-MAX32/chipKIT%20Max32_bysa_sch.pdf