Took me awhile to find the Mac address of my MDA. Here's how to do it:

  1. Turn on your wifi (doesn't matter if you can connect to anything or not)
  2. Go to  Comm Manager and open Settings - choose Wireless LAN
  3. Along the bottom tabs choose Advanced
  4. Your Mac address will be there and will be in this format xx-xx-xx-xx-xx-xx

You can ONLY get your Mac address when your wifi in ON

Cheers!