Interlogix NX-208E User Manual

P/N INX208EIM • REV E • NOV12

NX-208E Two-Wire Smoke Loop Expander

Gauge

Ohms per/1000 feet

12

1.0588

13

2.003

14

2.525

15

3.184

16

4.016

18

6.385

20

10.15

Installation and Startup

Product summary

The NX-208E is a microprocessor-controlled 2-wire smoke
expander for the NetworX NX-6, NX-8, and NX-8E control
panels. One NX-208E module can be added to the NX control
panel with a maximum zone count of 8 zones. Each expander
has an optional tamper input making it ideal for use in a remote
location.

Note: Do not add normally open contact devices to an NX­208E loop (i.e. sounder, heat detectors, pull stations, water
flow devices, etc.

Installation guidelines

Inside the can, several 2-holed insertion points have been
constructed. This allows for either vertical or horizontal
placement of the modules. Notice that each insertion point has
two sizes of holes -a larger hole and a smaller hole. (Figure 1
below).

1. The black plastic PCB guides are grooved on one edge
where the PC board will be seated. The end with the half­moon protrusion fits into the larger hole. The smaller hole
is for the screw.

Figure 1: Board installation

Caution: You must be free of static electricity before handling

circuit boards. Wear a grounding strap or touch a bare metal
surface to discharge static electricity.

Wiring references

The following references were taken from the “Reference Data
for Radio Engineers ” (6th edition).

2. Place the first black plastic PCB guide in the top insertion
point, grooved edge downward. The half-moon protrusion
will be in the large hole. It does not require force. Insert
one of the provided screw into the smaller hole (from
inside the can) to secure it in place. A screwdriver should
reach through the notch that runs the length of the guide
to tighten the screw. The second PBC guide should be
positioned opposite the first (grooved edge up) and placed
in the lower insertion point, using the same procedures
described above. Once mounted, screw it in securely.

3. The PC Board should slide freely in the grooves of both
guides.

Wiring connections

Terminal

Descriptions

COM

TAMPER

Connect normally closed tamper switch between this
pin and COM.

DATA

Connect to the DATA terminal of the control panel. (See
Figure 2 above)

COM

Connect to the COM terminal of the control panel.

AUX+

Connect to the AUX+ terminal of the control panel.

COM

DCIN

Connect to the AUX PWR+ terminal of the control
panel. Optionally, connect to an auxiliary 12V or 24V
power supply (i.e. NX-320E, etc).
Be sure to connect GND of pow er supply to NX-208E.

ZONE8-

Connect (Zone 8 negative) to negative side of smoke
detector. Open (trouble) or short (alarm) causes a
smoke condition and sounds the keypad by default, but
is programmable. (See Figure 2 above)

ZONE8+

Connect (Zone 8 positive) to the positive side of the
smoke detector. Open or short causes a smoke
condition and sounds the keypad. (See Figure 2 above)

ZONE7­through
ZONE1+

Connect as described above for ZONE8- & ZONE8+.

Figure 2: Wiring connections

Enrolling the module

The NetworX control panels have the ability to automatically
find and store in memory the presence of all keypads, zone
expanders, wireless receivers and any other module
connected to the data terminal. This allows these modules to
be supervised by the control panel.

To enroll the modules, enter the Program Mode of the control
panel (refer to the installation manual for the specific control
panel). When the Program Mode is exited, it will automatically
enroll the devices. The enrolling process takes about 12

seconds, during which tim e the “Service” LED will illum inate.

User codes will not be accepted during the enrolling process.
Once a module is enrolled, if it is not detected by the control
panel the “Service” LED will illuminate.

Module address

This 2-wire smoke module has a fixed address of 95. When
programming the expander module, enter the Program Mode
and select the device address as 95. (Refer to "Programming
Mode" section for further details.)

Programming mode

Terminal descriptions

Table 1: Terminal descriptions

1. To enter the program mode, press [�]-[8]. All of the
function key LEDs will begin to flash.

2. Enter the "Go To Program" code (factory default is [9]-[7]­[1]-[3]). If the code was valid, the Service LED will flash,
and the function LEDs will illuminate steady, indicating the
device to program should be entered.

3. Press [9]-[5]-[#] for the fixed address of the 2-wire smoke
module. The Armed LED will illuminate while it is waiting
for a programming location to be entered.

4. Enter the desired programming location. The Armed LED
will begin to flash while a programming location is being
entered.

5. Press [#]. If this is a valid location, the Armed LED will
extinguish, the Ready LED will illuminate, and the binary
data for the first segment of this location will be shown on
the zone LEDS.

6. To change the data, enter the data followed by [�]. The
data will be entered, and the location will automatically
increment to the next segment. The data for that segment
will be displayed. This procedure is repeated until the last
segment is reached. Pressing the [#] key will exit from this
location. To review the data, repeat the above procedure,
pressing the [�] key without entering data first. Each time
the [�] key is pressed the next segment is displayed.

2 NX-208E Two-Wire Smoke Loop Expander Installation and Startup