Terminal Descriptions - UTC Fire and Security Interlogix NX-8E Installation Manual

Terminal descriptions

Table 2 below describes the terminals shown in the wiring diagram.
Table 2: NX-8E terminals
Terminal Description
R1 House telephone ring (gray).
R Telephone ring (red)
T Telephone tip (green)
T1 House telephone tip (brown)
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.
KP DATA Connect to the data terminal on the keypads and the expanders. Maximum
number of devices (keypads plus expanders) is 32.
KP COM Connect to the common terminal on the keypads and the expanders.
KP 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 PWR+ 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. Connect one side to AUX PWR+
only if using a two-wire smoke. Refer to the wiring diagram. Program Location
37, Segment 6, Option 1.
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).
NX-8E Control Panel Installation Manual
Chapter 1: Reporting codes
5