THanks. That helped. So the key is to be able to link instances to groups as opposed to just linking as a device. The Keypadlinc can do that in firmware but the PLC probably needs HA software with that functionality to help it do it. I don’t think Girder can do that yet (their focus right now is on the PLM which is slightly different.)
I noticed using the SHN utility to turn on and off specific zones and looking at the traffic that the format seems to be cmd1 = action and cmd2 = zone. I wonder if there is a freeware program where I can just manually program group links into the PLC.
Zone1 on = To ID:06.4e.4b flags:0F cmd1:40 cmd2:0
Zone1 off = To ID:06.4e.4b flags:0F cmd1:41 cmd2:0
Zone2 on = To ID:06.4e.4b flags:0F cmd1:40 cmd2:1
Zone2 off = To ID:06.4e.4b flags:0F cmd1:41 cmd2:1