Features:
4 auxiliary Inputs and 4 auxiliary Outputs per module Up to 4 modules (16 Inputs and Outputs) can be added per NXT-4D, up to 2 modules (8 Inputs and Outputs) per NXT-2D 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 Status Indicator LEDs for power, communication, and relay position Dedicated Tamper Input Quick Disconnect Connectors Locking Metal Enclosure (optional without)