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Terminal descriptions
Table 2 below describes the terminals shown in the wiring diagram.
Table 2: NX-8V2 terminals
Terminal
Description
R1
Not used
R
Telephone ring (red wire on the standard RJ-31X cord)
T
Telephone tip (green wire on the standard RJ-31X cord)
T1
Not used
EARTH
Earth ground. Connect to a cold water pipe or a 6 to 10 ft. driven rod.
AC
AC input. Connect to a 16.5 V 40 or 50 VA Class II UL approved transformer.
BELL+ and
If used as a siren output (default), the speaker rating is 15 watt at 8 or 16
BELL-
ohms, or 30/40 watt at 4, 8, or 16 ohms. If voltage output is selected in
Location 37, this output becomes voltage output, 12 VDC, 1 A maximum load.
A 3.3 kohm resistor is required across the bell terminals when a 12 VDC siren
is used. If no resistor is used, you may experience voltage leakage into the
siren, which causes these devices to output a small signal.
DATA
Connect to the data terminal on the keypads and the expanders. Maximum
number of devices (keypads plus expanders) is 32.
COM
Connect to the common terminal on the keypads and the expanders.
POS
Connect to the POS terminal on the keypads and the expanders. Individually,
this terminal is limited to 1 amp. Combined, this terminal and AUX PWR+ are
limited to 2 amps total current.
SMOKE+
Smoke detector power 12 VDC, 1.5 amps maximum (for those jurisdictions
that allow the priority zone to be used with smoke detectors.)
COM
Connect negative wire of powered devices such as motion detectors and
smoke detectors.
AUX+
Connect positive wire of all powered devices except smoke detectors and
keypads. Individually, this terminal is limited to 1 amp. Combined, this terminal
and KP POS are limited to 2 amps total current.
ZONE 8
Connect to one side of the zone 8 loop. Connect the other side to the COM
terminal. Open or short causes an alarm. Zone 8 may be used for a two-wire
smoke detector using a 680 W EOL resistor.
COM
Common (-) terminal for zones 7 and 8.
ZONE 7
Connect to one side of zone 7 loop. Connect the other side to the COM
terminal. Open or short causes an alarm.
ZONES 6 to 1
Connect as describes for zones 7 and 8. (Only zone 8 can be a two-wire
zone).
AUX 4 to 1
Connect negative lead of low current device (relays or LEDs, etc.). Install 1
kohm resistor in series if connected to an LED. Connect positive lead of
device to AUX+. Current is limited to 50 mA.
NX-8V2 Control Panel Installation Manual
Chapter 1: Reporting codes
5
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