Keri Systems NXT-4D 4-Door NXT Controller with Keri firmware

4-Door Access Control Controller with integrated Ethernet connectivity for modern security networks. Features on-board TCP/IP networking, eliminating the need for separate adapters and reducing cabling costs by up to 50% compared to traditional hardwired systems. Supports standard CAT5 cabling on existing or dedicated networks. The controller delivers intelligent local decision-making with minimal network bandwidth consumption, ideal for bandwidth-conscious environments. Embedded MAC address enables one-button auto-configuration for quick deployment. Expandable via up to four companion 4x4 Input/Output boards across RS-485 trunks for enhanced system capabilities. Supports multiple reader types including 4-wire proximity readers with supervision, standard Wiegand output readers, and legacy reader interfaces. Accommodates up to 256 controllers (1024 doors) and 4096 auxiliary I/O points per network. Stores 50,000 cardholders and maintains a 10,000-event buffer per controller. Built-in tamper input, re-assignable inputs and outputs, and flash memory for firmware updates. Includes standard 4-pin block and RJ jack connectors with quick-disconnect terminals. Housed in optional locking metal enclosure. Managed through intuitive Client/Server software with familiar interface and advanced functionality for comprehensive access control administration.