why do I get the error message: "please change keypad setting to 12-button keypad in program settings" when connecting with HHD to AD-200?

in SMS Express, you have to enable the 12-button keypad for the AD-200:
 - log into Express and go to  "Settings" -> "Program Settings" in the menu across the top;
 - click on the "Credentials and Devices" tab
 - click / check "Using only 12 button keypads"  (Note: Express will still work with non-12 button locks, such as the CM locks)
 - click "Close" at the bottom of the window
and try to connect to your AD-200 lock again

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