In reading the COSMOD2W manual I noticed this jewel: "Note: CO Trigger may only be used with UL 864 panels that have been evaluated to confirm CO services".
I know others here have used this with Elk and older DSC. I haven't found that either are UL 864 listed. Nor is my UltraSync.
I'm doing new home construction so will have to pass AHJ. Should I abandon using hardwired CO and just go with plug-in units?