Connect Ring Doorbell 3 to executone chime

I m trying to connect Ring doorbell 3 to my current door bell but not sure it is compatible with ring door bell3. Can some one explain what is electrical configuration of the 2 screw terminals on the Ring Door bell 3? Is this a resistive contact or a voltage input. Is there a schematic for this input/output interface? Does RingDoorBell 3 provide resistive contact at this terminal to close the 2 contacts to activate the existing bell in my home? I measured the resistance of this two contact and it shows a 91 ohms reading. There was no AC or DC potential reading on this screw terminal. There was no change in resistance or voltage potential when the Dooring bell 3 is pressed. Any help to understand this circuit will be greatly appreciated.