I’m going to finally get around to installing a relay to bridge my hardwired smoke detectors into the hub. It got me thinking, though, has anyone spliced together a circuit to permit you to remotely trigger the alarms by dumping voltage onto the interconnect wire from a battery? According to the diagrams any 9 volt source (+ on red, - on neutral) should trigger all alarms.
I’m thinking I could use the smoke alarms as secondary sirens for the burglar system, as they are VERY loud given the number we have. Plus maybe I’d want to be able to trigger them for other reasons.
In my head at least it would be as easy as wiring a switch in with the relay so when the switch is closed it routes voltage from a 9-volt battery onto the interconnect wire.