What do I need to do to add Z-Wave to my GC2 control panel? Do I have to add the 900mhz board?
The Go!Control Panel simply has a Z-wave radio built into its board. No additional hardware is required (aside from the Z-wave devices themselves, of course.)
You can verify that Z-wave is enabled in programming. Q79 in programming enables or disabled this feature.
Qs 80-85 are additional Z-wave related programming questions.
Note that for control and automation of the Z-wave devices through Alarm.com, your service plan needs to be Gold Interactive.