NXT 4x4 Module Specifications

NXT 4x4 Module Specifications

Specifications:

Size (Enclosure):

8” H x 7” W x 2.75” D (20.32 cm x 17.78 cm x 6.98 cm)

Size (PC Board):

5.25” H x 3.10” W x 1” D (13.33 cm x 7.87 cm x 2.54 cm)

Weight (In Enclosure):

2.5 Lbs (1.14 Kgs)

Input Voltage:

+ 12 VDC nom. (10 - 14 VDC)

Current Draw:

250 mA typical

Inputs:

4 general purpose Inputs or configurable in software to:
 - Door Contact Switch - Request to Exit - Bond Sensor

Outputs:

4 general purpose Outputs/Relays 1.0 amp (24 VDC max.) dry circuit

Temperature / Humidity:

-40° F to 140° F (-40° C to 60° C) 0-90% Non Condensing

Communication: To Controller:

RS-485

Lithium Battery:

5 years Memory Retention



Connection


Run Length


Purpose


Conductors


Shielded


Stranded


Twisted Pair


AWG


RS-485 from NXT-MSC controller to NXT 4x4 (with or without an NXT 1R/3R/5R reader)



Up to 500 feet (150 meters)


Power



2


N


Y


N


18

Data

2
Y
Y
Y
22 or 24


RS-485 from NXT-MSC controller to NXT 1R/3R/5R readers


Up to 1,000 feet (300 meters)



Power


2


N


Y


N


18

Data

2
Y
Y
Y
22 or 24


Controller Power, Inputs, and Outputs Cable Requirements

Connection
Total Run Length
# of Conductors
Shielded
Stranded
AWG
Controller Power
250 feet [a]
2
N
Y
18
Earth Ground
Shortest path [b]
1
N
N
18
Inputs and Outputs [C]
500 feet
2
N
Y
22
  1. To meet CE and C-tick regulations, the length of the controller power line can be no longer than 3 Meters (9.85 feet).
  2. Use the shortest possible path from earth ground point to PCB. Connect the earth ground only to the designated pin on the terminal block. This is important as all transient protection for the unit is made through this earth ground connection. For unit protection, the earth ground connection should always be made first.
  3. Values listed are minimums. Individual input and output devices may have more specific requirements.

Notes: 
  1. The Lock Output relay may require a heavier gauge of wire depending upon the current demands of the lock and the length of the lock wiring run.
  2. Cable resistance causes a drop in voltage at the end of long cable runs. Ensure the appropriate power and current for your device is available at the device at the end of the cable run. Heavier gauge cable reduces this effect.
  3. Keri does not recommend hot-plugging a Reader, RIM, or 4x4 into an NXT controller. Remove power from the controller prior to connecting these devices.