NX-8 Control56TERMINAL DESCRIPTIONTERMINAL DESCRIPTIONR1 House Telephone Ring (Grey).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 25, 40 or 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 30/40watt at 4, 8, or 16 ohms. If voltage output is selected in location 37, this output becomes voltageoutput, 12VDC, 1 Amp maximum load. NOTE: A 3.3K Ω resistor may be required across thebell terminals when a 12 VDC siren is used. If no resistor is used, you may experiencevoltage 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(keypads + expanders) is 32. See AMaximum 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 1 amp total current when added together.SMOKE+ Smoke detector power 12VDC, 1.5 amps maximum (For those jurisdictions which allow thePriority 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 terminaland KP POS are limited to 1 amp total current when added together.ZONE 8 Connect to one side of zone 8 loop. Connect the other side to com terminal. Open or short causesalarm. Zone 8 may be used for a two-wire smoke detector using a 680 Ω E.O.L. resistor. W3must 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 shortcauses alarm.ZONE 6 -ZONE 1 Connect as described for zones 7 & 8. Only zone 8 can be a two-wire zone. (See the wiringdiagram for examples.)AUX 4 –AUX 1Connect negative lead of low current device [relay, LED(install 1kΩ resistor in series with LED),etc.]. Connect positive lead of device to AUX PWR +. Current is limited to 50mA when output isnegative, and 250FA when output is positive.NETWORX KEYPAD MAXIMUM WIRE RUN(Note: These numbers are for one keypad at the end of the wire. When connecting more than one keypad to the end ofthe wire, a higher gauge wire will be required.)WHEN CONNECTED TO NX-8 WHEN CONNECTED TO NX-320Length in feet Wire Gauge Wire Gauge250 24 22500 20 181000 18 161500 16 142500 14 12