bb400,
I fly a Diamond Star DA40D which uses a garmin GNS430.
This is a link to the manual for the CDI unit in the aircraft that I fly.
Verify that yours is the same and you should find all you need to know.
http://www.midcontinentinstruments.c...manuals.html&1
For some reason my first link would not work, if you go to the above page you need to look at the MD200 series CDI's.
Good Luck
NTB