How do I add a wired siren to a 2GIG GC3?

This diagram shows the wiring required to use an Altronix RBSNTTL low current, sensitive relay, triggered by the GC3 panel's bell output, to sound a 3rd party high current siren by switching the power provided by a 12VDC power supply. In this example, we're using the positive trigger (Bell Positive) and breaking the positive leg of power through the relay. Because the negative trigger is not being used, and we have a common power source, it must be strapped out to the common power negative via a wire jumper. Since we're using the panel's bell output as our trigger, no special programming is required. Any alarm that would normally sound the bell output will activate the relay and sound the siren. We have a kit which contains the RBSNTTL, an AD12612 1.2 Amp power supply with Transformer, 4 AH backup battery, and a small metal enclosure to mount it all in. The only thing not included is the siren itself. This kit was originally configured to work with Honeywell's Lynx Touch panels, but will work fine with the 2GIG GC3 also.