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Keri Systems NXT-4x4 Input/Output Expansion ModuleKeri Systems NXT-4x4 Input/Output Expansion Module
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Keri Systems NXT-4x4 Input/Output Expansion Module

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The NXT-4X4 Input/Output Expansion Module provides functionality to any Doors NetXtreme 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, 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 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 a reader interface module (NXT-RMX) to allow Keri MS reader signals to be sent down the RS-485 line.

Availability: In stock


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Product Description


• 4 auxiliary Inputs and 4 auxiliary Outputs per module
• Up to 4 modules (16 Inputs and Outputs) can be added per NXT-4D Controller, up to 2 modules (8 Inputs and 8 Outputs per NXT-2D Controller
• Re-assignable, Interchangeable with controller’s door I/O
• 4-State Supervision on Inputs
• Can be used for Door Forced and Door Held Open Alarms as well as Auxiliary REX Inputs, Latch Integrity, Bond Sensor, or other general purpose functions
• Flash Memory for easy upgrades
• Powered from Controller (standard) or optional standalone power supply
• Status Indicator LEDs for power, communication, and relay position
• Quick Disconnect Connectors
• Locking Metal Enclosur
• Reduces wiring by providing capability to move door management functions to the door location

Additional Information

Additional Information

Manufacturer Keri Systems Incorporated
Model NXT-4x4
Dimensions (Enclosure) 8” H x 7” W x 2.75” D (20.32 cm x 17.78 cm x 6.98 cm)
Dimensions (PC Board) 5.25” H x 3.10” W x 1” D (13.33 cm x 7.87 cm x 2.54 cm)
Power Requirements + 12 VDC nom. (10 - 14 VDC
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
Warranty 1 Year Warranty
Weight 3.0000


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