Thanks, the SSC-32 can be hooked up through RS232 signals, which I would then use a Max232 or the like to hook it up. However it is also set up to use TTL level inputs/outputs, which I normally use when connecting up to a micro-controller.
I have dealt a little with the 3.3v to 5v issue a few times now, with a few different platforms especially with connecting up XBee's to controllers. I am a software persons, so please pardon if I get a few terms slightly off... Some approaches I have used in the past include:
a-) Pic32. - Just wired them up. Most of their IOs are 5v tolerant.
a) Current limiting resistor. I believe that this was all that was necessary hooking up a propeller to the SSC-32. I believe they have clamping diodes or the like protecting the propeller...
a+) Diode(s)? Never used this approach
b) Resistor Divider from the TX of the SSC-32 to the RX of controller. Assume that the 3.3 output from DUE will be high enough for a high on SSC-32... Note: I have run into issues with XBees on Sparkfun XBee converter...
c) like b) but with mosfet transister and 2 resister level shifter circuit - What I have used for XBees on the shield...
d) Use a level shifter IC like: TXB0108 there is also a 4 channel version s well. I believe this is what Parallax uses on their XBee interface boards which have always worked well for me. Also Adafruit sells a simple breakout board for them: http://www.adafruit.com/products/395
I am thinking I probably should do c) or d), but was wondering what others have done.