Does the VISTA 20P have on-board relays?

The Vista-20P and Vista-15P (version 2 or higher), and Vista-21IP (all versions) feature on-board voltage triggers. The Vista-15P/20P version 1 panels have these outputs, but the specifications differ, and are not shown here. Though these triggers are not a dry contact closure, they may be used to activate a relay output via panel programming.

Either of the wiring harnesses shown above can be used to connect to the on-board triggers. The Honeywell 4120TR is a wiring harness that should cover all your bases. Specifications on the triggers are:

Output 17 (trigger 1)

Floating negative trigger which provides 15 Ohms to ground when activated (on) and is open when off. This trigger provides 12VDC at 100mA.

Output 18 (trigger 2)

Floating negative trigger which provides 100 Ohms to ground when activated (on) and is open when off. This trigger provides 12VDC at 20mA.

Either trigger can be inverted, meaning that instead of floating (not being connected to ground) in the normal state, they can connect to ground in that state, providing their voltage and current constantly, and would remove the ground reference, thereby taking voltage away, when activated or turned on. This is the programming option used to allow the trigger to power up to 2 4-wire smoke detectors and reset them via panel programming, without having to add any additional relays. The programming options for the trigger are exactly the same as for a 4204 or 4229 relay, with the additional option of inverting the triggers.