NXT - 4x4
Input/Output Expansion Module
• 4 auxiliary Inputs and 4 auxiliary Outputs per module
• Up to 4 modules (16 Inputs and Outputs) can be
• Re-assignable, Interchangeable with
• 4-State Supervision on Inputs
• Can be used for Door Forced and Door Held
• Flash Memory for easy upgrades
• Powered from Controller (standard) or
added per NXT-4D Controller, up to 2 modules (8
Inputs and 8 Outputs per NXT-2D Controller
controller’s door I/O
Open Alarms as well as Auxiliary REX Inputs,
Latch Integrity, Bond Sensor, or other general
purpose functions
optional standalone power supply
• Status Indicator LEDs for power,
communication, and relay position
• Quick Disconnect Connectors
• Locking Metal Enclosure (optional without)
• Reduces wiring by providing capability to move door
management functions to the door location
The NXT-4D Input/Output Expansion Module provides functionality to any Doors.NET™ access control system
by adding auxiliary I/O that can be used for additional access control functionality, monitoring non-reader doors
or other devices, and creating powerful action sequences by linking input triggers to outputs. The module can be
connected anywhere along the RS-485 trunk/buss, most commonly at the controller or near a reader. One module
can be added per trunk, allowing up to an extra 8 inputs and 8 outputs on an NXT-2D Controller and an extra 16
inputs and 16 outputs on an NXT-4D Controller.
The module’s relays are re-assignable and interchangeable with the main controller’s relays. The module can be
mounted next to the door providing local door control and local door alarm functions while minimizing the cable
bundle from door to controller. The unit also has a port to plug in an NXT-RM3 Reader Interface Module to allow Keri
MS reader signals to be sent down the RS-485 line.
2305 Bering Drive San Jose, California 95131
408-435-8400 Toll Free: 800-260-5265 Fax: 408-577-1792
NXT 4x4 - Input/Output Expansion Module
DATA SHEET, Page 2 of 2
Speci cations:
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
con gurable 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
Presented By:
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
PN: 01794-001 Rev. F
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