Interlogix NX-8V2 REV H Installation Manual - Manual (Page 61)

Chapter 3: Reporting codes
NX-8V2 Control Panel Installation Manual 57
Phone or power voltage Value
Battery to battery 13.5 VDC
Table 11: Zone voltages (

10%)
Zone condition Value
Zones, not doubled
Open 13 VDC
Good (3.3 kohm resistor) 6.6 VDC
Shorted 0 VDC
Two-wire smoke (680 ohm resistor) 10.75 VDC
Zones, doubled
Open 13 VDC
Only low zone OK (3.74 kohm resistor) 7 VDC
Only high zone OK (6398 kohm resistor) 9 VDC
Both high and low zones OK 5.5 VDC
Shorted 0 VDC
Normally open zones (such as four-wire smoke) Use low zone resistor (3.74 kohm resistor).
Cannot use the corresponding high zone.
Specification
Operating power 16.5 VAC 40 or 50 VA transformer
Auxiliary power
with 25 VA transformer
with 40 or 50 VA transformer
with NX-320E power supply
12 VDC regulated 500 mA
12 VDC regulated 1 A
12 VDC regulated 2 A plus control panel power
Loop resistance
Standard loop
Two-wire smokes
300 ohms max.
30 ohms max.
Built-in siren driver Two tone (temporal and yelp)
Loop response Selectable 50 mS or 500 mS
Operating temperature 32 to 120

F (0 to 49

C)