How are the VISTA-128FBP bell output circuits wired and what supervision method does the system use to detect an open or short?

I couldn't find the specific wiring instructions or the supervision method (such as resistor values) for the bell output circuits in the provided manuals. The documentation confirms that Bell 1 Output (Zone 970) and Bell 2 Output (Zone 971) are Notification Appliance Circuits that will trigger a "CHECK" or "TRBL" display if a system trouble condition exists (Page 60) [1].