Chapter 1: Reporting codes
NX-8E Control Panel Installation Manual 5
Terminal descriptions
Table 2 below describes the terminals shown in the wiring diagram.
Table 2: NX-8E terminals
House telephone ring (gray).
House telephone tip (brown)
Earth ground. Connect to a cold water pipe or a 6 to 10 ft. driven rod.
AC input. Connect to a 16.5 V 40 or 50 VA Class II UL approved transformer.
If used as a siren output (default), the speaker rating is 15 watt at 8 or 16
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.
Connect to the data terminal on the keypads and the expanders. Maximum
number of devices (keypads plus expanders) is 32.
Connect to the common terminal on the keypads and the expanders.
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 detector power 12 VDC, 1.5 amps maximum (for those jurisdictions
that allow the priority zone to be used with smoke detectors.)
Connect negative wire of powered devices such as motion detectors and
smoke detectors.
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.
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.
Common (-) terminal for zones 7 and 8.
Connect to one side of zone 7 loop. Connect the other side to the COM
terminal. Open or short causes an alarm.
Connect as describes for zones 7 and 8. (Only zone 8 can be a two-wire
zone).
