UL Addendum - Tyco Security Products

Single Resistor End Line ModeWiring for Multiple Device NC Alarm ZonesTo wire a NC alarm loop with multiple alarm devices to an input circuit, wire the switches inseries and connect a single 1 K Ω EOL resistor in series with the “end of line” alarm device asshown below. This circuit will provide 4-state supervision, Secure, Alert, Shorted, and LineFault. This mode will prevent supervision errors from being reported to the Monitoring Stationwhen Open Loop is detected. In a single end of line resistor input configuration with multipledevices, an Open Loop is seen as an alarm.Multiple Device Alarm Zone:Normally Closed Switches1 KohmInput CircuitAlarm DeviceAlarm DeviceReference Table below for Line Status conditionsThe number of normally closed detection devices that each NC alarm input can supervise islimited only by the resistance of the loop. The total EOL resistance for wire length, contacts, andthe supervision EOL resistor must not exceed 1300 Ω.Single Resistor End Line Mode – Ranges of resistanceStatus Input Resistance CommentShort 0 – 100 ShortLine Fault 101 – 360 Wrong resistorNO Alarm 361 – 750 500 Ω (N/A)Secure 751 – 1450 1K ΩNC Alarm 1451 – 2980 2K Ω (N/A)Line Fault 2981 – 11.8K Wrong resistorAlarm >11.8K Treated like 2K ΩC·CURE 800/8000 V9.4 UL Addendum31