NX-8 Commercial Fire
48
15. TERMINAL DESCRIPTION
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 foot driven rod.
AC
AC input. Connect to a 16.5V 50 VA Class ll U.L. approved transformer.
BELL + &
BELL -
If used as a siren output (default), the speaker rating should be 15 watt at 8 or 16 ohm, or 30/40 watt
at 4, 8, or 16 ohms. If voltage output is selected in location 37, this output becomes voltage output,
12VDC, 600mA maximum load. NOTE: A 3.3K
Ω
resistor may be 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 will cause these devices to output a small signal.
KP DATA
Connect to the data terminal on the keypads and the expanders. Maximum number of devices
(k expanders) is 32. See
A
Maximum Wire Run
@
chart below.
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. This terminal and AUX PWR + are
limited to 400mA total current when added together.
SMOKE+
Smoke detector power 12VDC, 400mA maximum (For those jurisdictions which 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. This terminal
and KP POS are limited to 400mAtotal current when added together.
ZONE 8
Connect to one side of zone 8 loop. Connect the other side to com terminal. Open or short causes
alarm. Zone 8 may be used for a two wire smoke detector using a 680
Ω
E.O.L. resistor. W3 must
be set for two-wire smoke detector loop. For normal zone operation, W4 must be set.
COM
Common (-) terminal for zones 7 & 8. (See the wiring diagram for examples.)
ZONE 7
Connect to one side of zone 7 loop. Connect the other side to COM terminal. Open or short causes
alarm.
ZONE 6 -
ZONE 1
Connect as described for zones 7 & 8. Only zone 8 can be a two-wire zone. (See the wiring
diagram for examples.)
RELAY 2
Refer to Relay 1 shown below.
N.O.
Normally open dry contact rated 1 Amp at 30 Volts.
COM
Common dry contact rated 1 Amp at 30 VDC.
RELA
Y
1
N.C.
Normally closed dry contact rated 1 Amp at 30 Volts.
AUX 4 –
AUX 1
Connect negative lead of low current device [relay, LED (install 1k
Ω
resistor in series with LED),
etc.]. Connect positive lead of device to AUX PWR +. Current is limited to 25mA when output is
negative.
KEYPAD MAXIMUM WIRE RUN
These numbers are for one keypad at the end of the wire. When connecting more than one keypad to the end of
the wire, a higher gauge wire will be required.
WHEN CONNECTED TO NX-8-CF
WHEN CONNECTED TO NX-320E
Length in feet
Wire Gauge
Wire Gauge
250
24
22
500
20
18
1000
18
16
1500
16
14
2500
14
12
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