Two 2 Gig GC2 panels in same system

Can I use a 2GI GC2 control panel as a secondary or tertiary panel like a TS1?

No, you can not utilize a 2GIG GC2 as your main panel and have another GC2 as your secondary panel. When looking to utilize a secondary panel for the 2GIG GC2, your option for a touchscreen secondary is the 2GIG TS1.