Do you have the EMIC data sheet?

If you don't, I recommend you download a copy. http://www.parallax.com/dl/docs/prod...micModules.pdf

Unless you have a newer model EMIC, that doesn't have the switch, it should have a 2-position DIP switch
located just below the Winbond IC.

Just like the one shown in this photo below towards the center of the Winbond IC.
http://www.parallax.com/images/prod_jpg/30006.jpg

These are labeled 1 and 2 on the DIP switch. Move 1 to the ON position (up).

Page #5 in the data sheet covers the DIP switch.